Hydroponically grown 12-day-old rice (Oryza sativa L. cv. BRRI dhan47) seedlings were exposed to ... more Hydroponically grown 12-day-old rice (Oryza sativa L. cv. BRRI dhan47) seedlings were exposed to 150 mM NaCl alone and combined with 0.5 mM MnSO 4. Salt stress resulted in disruption of ion homeostasis by Na ? influx and K ? efflux. Higher accumulation of Na ? and water imbalance under salinity caused osmotic stress, chlorosis, and growth inhibition. Salt-induced ionic toxicity and osmotic stress consequently resulted in oxidative stress by disrupting the antioxidant defense and glyoxalase systems through overproduction of reactive oxygen species (ROS) and methylglyoxal (MG), respectively. The salt-induced damage increased with the increasing duration of stress. However, exogenous application of manganese (Mn) helped the plants to partially recover from the inhibited growth and chlorosis by improving ionic and osmotic homeostasis through decreasing Na ? influx and increasing water status, respectively. Exogenous application of Mn increased ROS detoxification by increasing the content of the phenolic compounds, flavonoids, and ascorbate (AsA), and increasing the activities of monode-hydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), superoxide dismutase (SOD), and catalase (CAT) in the salt-treated seedlings. Supplemental Mn also reinforced MG detoxification by increasing the activities of glyoxalase I (Gly I) and glyoxalase II (Gly II) in the salt-affected seedlings. Thus, exogenous application of Mn conferred salt-stress tolerance through the coordinated action of ion homeostasis and the antioxidant defense and glyoxalase systems in the salt-affected seedlings.
The present study was undertaken to investigate the regulatory role of exogenous application of c... more The present study was undertaken to investigate the regulatory role of exogenous application of calcium (Ca) in enhancing the antioxidant defense and glyoxalase systems in mitigating cadmium (Cd) stress in rice. Hydroponically grown fourteen-day-old rice (Oryza sativa L. cv. BRRI dhan29) seedlings were exposed to 0.25 and 0.5 mM CdCl2 alone and in combination with 2.5 mM CaCl2 for three days. Exposure to Cd caused chlorosis, leaf rolling symptoms, and growth inhibition. A higher concentration of Cd in the growth medium resulted in higher Cd accumulation, which induced oxidative stress through overproduction of reactive oxygen species (ROS) by disrupting the antioxidant defense system. Cadmium treatment increased the methylglyoxal (MG) level. Calcium supplementation in the Cd-treated growth medium reduced Cd uptake. Application of Ca also significantly increased the (ascorbate) AsA content, increased the activities of superoxide dismutase (SOD), catalase (CAT), glutathione S-transferase (GST), monodehydroascorbate reductase (MDHAR) and dehydroascorbate reductase (DHAR) in the antioxidant system, and increased the glyoxalase I (Gly I) and glyoxalase II (Gly II) activities in the glyoxalase system in rice seedlings exposed to both levels of Cd. Exogenous Ca regulates the antioxidant defense and glyoxalase systems, which reverses overproduced ROS and detoxifies methylglyoxal, which in turn reduces Cd toxicity.
The effect of exogenous calcium (Ca) on hydroponically grown rice seedlings was studied under ars... more The effect of exogenous calcium (Ca) on hydroponically grown rice seedlings was studied under arsenic (As) stress by investigating the antioxidant and glyoxalase systems. Fourteen-day-old rice (Oryza sativa L. cv. BRRI dhan29) seedlings were exposed to 0.5 and 1 mM Na2HAsO4 (As) alone and in combination with 10 mM CaCl2 (Ca) for 5 days. Both levels of As caused growth inhibition, chlorosis, reduced leaf RWC, and increased As accumulation in the rice seedlings. Both doses of As in growth medium induced oxidative stress through overproduction of reactive oxygen species (ROS) by disrupting the antioxidant defense and glyoxalase systems. Exogenous application of Ca along with both levels of As significantly decreased As accumulation and restored plant growth and water loss. Calcium supplementation in the As-exposed rice seedlings reduced ROS production, increased ascorbate (AsA) content, and increased the activities of monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), catalase (CAT), glutathione peroxidase (GPX), superoxide dismutase (SOD), and the glyoxalase I (Gly I) and glyoxalase II (Gly II) enzymes compared with seedlings exposed to As only. These results suggest that Ca supplementation improves rice seedling tolerance to As-induced oxidative stress by reducing As uptake, enhancing their antioxidant defense and glyoxalase systems, and also by improving growth and physiological condition.
A field experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh duri... more A field experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during aman season with a view to find out the yield potential of transplant aromatic rice varieties under different weed control strategies. The experiment was carried out with four varieties i.e. BRRI dhan34, BRRI dhan37, BRRI dhan50 and Chinigura in the main plot and five weed controlstrategies viz. control (no weeding), one hand weeding at 15DAT, two hand weeding 15DAT + 40DAT, Topstar® 400SC (Oxadiargyl 400 g L-1) @ 100 g ha-1 as post-emergence and Sunrice® 150WG (Ethoxysulfuron 150 g kg-1) @ 185 ml ha-1 as pre-emergence herbicide in the sub plot in split plot design. The result showed that BRRI dhan34 gave highest (3.16 t ha-1) and BRRI dhan50 produced lowest grain yield (1.88 t ha-1). Sunrice® 150WG as pre-emergence herbicide controlled weeds very successfully which performed better in response of yield contributing characters of rice. Application of Sunrice® 150WG achieved highest grain yield which was 50.73%, 32.07%, 11.95% and 5.25% higher than the yield obtained from control, one hand weeding, two hand weeding and Topstar® 400SC treated plots, respectively. The interaction of BRRI dhan34 in combination with Sunrice® 150WG produced the highest grain yield (4.10 t ha-1) while lowest grain yield (1.44 t ha-1) was obtained from BRRI dhan50 in control treatment.
Mirza Hasanuzzaman,1 Md. Mahabub Alam,2 Anisur Rahman,1,2 Md. Hasanuzzaman,1
Kamrun Nahar,2,3 an... more Mirza Hasanuzzaman,1 Md. Mahabub Alam,2 Anisur Rahman,1,2 Md. Hasanuzzaman,1
Kamrun Nahar,2,3 andMasayuki Fujita2
Abstract
The present study investigates the roles of exogenous proline (Pro, 5mM) and glycine betaine (GB, 5mM) in improving salt stress tolerance in salt sensitive (BRRI dhan49) and salt tolerant (BRRI dhan54) rice (Oryza sativa L.) varieties. Salt stresses (150 and 300mM NaCl for 48 h) significantly reduced leaf relative water (RWC) and chlorophyll (chl) content and increased endogenous Pro and increased lipid peroxidation and H2O2 levels. Ascorbate (AsA), glutathione (GSH) and GSH/GSSG, ascorbate peroxidae (APX),monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), glutathione reductase (GR), glutathione peroxidase (GPX), catalase (CAT), and glyoxalase I (Gly I) activities were reduced in sensitive variety and these were increased in tolerant variety due to salt stress. The glyoxalase II (Gly II), glutathione S-transferase (GST), and superoxide dismutase (SOD) activities were increased in both cultivars by salt stress. Exogenous Pro and GB application with salt stress improved physiological parameters and reduced oxidative damage in both cultivars where BRRI dhan54 showed better tolerance. The result suggests that exogenous application of Pro and GB increased rice seedlings’ tolerance to salt-induced oxidative damage by upregulating their antioxidant defense system where these protectants rendered better performance to BRRI dhan54 and Pro can be considered as better protectant than GB.
A. Rahman, P. K. Biswas, M. S. A. Sarder and M. I. K. Khan
ABSTRACT
The experiment was conduc... more A. Rahman, P. K. Biswas, M. S. A. Sarder and M. I. K. Khan
ABSTRACT
The experiment was conducted at the Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka from November, 2008 to March, 2009 to study the allelopathic effect of Brassica biomass on weed control and yield of wheat. The treatment of the experiment consisted of 3 factors as: 2 levels of field status viz. fallow land and field with Brassica; 2 levels of age viz. 25 days old Brassica and 35 days old Brassica; and 3 levels of Brassica biomass amount viz. 0 kg biomass m−2, 0.5 kg biomass m−2 and 1.0 kg biomass m−2. The highest grain yield was found from Brassica grown fields (2.68 t ha−1), 35 days old Brassica biomass (2.59 t ha−1) & 1.0 kg m−2 biomass application (2.71 t ha−1). The interaction effect of field status and Brassica biomass amount showed significant result on effective tillers linear m−1 (84.67), spike length (16.09 cm), filled grain spike−1 (50.93), weight of 1000 grains (41.22 g), grain yield (2.83 t ha−1) and straw yield (4.08 t ha−1). The highest thousand grain weight (41.84 g) was found from the field with 35 days old Brassica application @ 0.50 kg m−2. The maximum grain yield (2.86 t ha−1) was found from the field with 35 days old Brassica biomass application @ 1.0 kg m−2. Land with Brassica and application of 35 days old Brassica biomass @ 0.5−1.0 kg m−2 increased yield contributing characters and yield of wheat.
M. J. Jalal, M. J. Ullah, H. M. M. T. Hossain and A. Rahman
Abstract
The experiment was conduct... more M. J. Jalal, M. J. Ullah, H. M. M. T. Hossain and A. Rahman
Abstract
The experiment was conducted at the Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka from June, 2008 to December, 2008 to study the yield performance of aman rice with storage durations of uprooted rice seedlings at different ages. The experiment comprised three factors viz. A. Variety (2): BRRI dhan31 and BRRI dhan34, B. Seedling age (2): 30 days old seedlings and 40 days old seedlings and C. Storage durations (4): 0, 2, 4 and 6 days after uprooting. The experiment was laid out in Randomized Complete Block Design (Factorial) with three replications. Results indicated that BRRI dhan31 produced significantly higher number of effective tillers hill−1, weight of 1000-grains, grain yield (4.41 t ha−1), straw yield and harvest index. The results also revealed that 30 days old seedlings showed better performance than 40 days old ones in respect of the longer panicle (26.64 cm), higher number of total grains panicle−1 (160.26), number of filled grains panicle−1 (134.84), weight of 1000-grain (20.22 g) and grain yield (4.38 t ha−1). Among the storage durations of uprooted rice seedlings, 0 days storage durations showed best performance in respect of total grains panicle−1 (158.86), filled grains panicle−1 (138.54), 1000-grain weight (20.62 g), grain yield (3.98 t ha−1), straw yield (6.68 t ha−1) and harvest index (37.33%). BRRI dhan31 with 30 days old seedlings stored for up to 4 days and 40 days old seedlings stored for 2 days statistically showed no yield loss.
A. Rahman, P. K. Biswas, M. S. A. Sarder, M. Hasanuzzaman and M. Malek
Abstract
The experiment ... more A. Rahman, P. K. Biswas, M. S. A. Sarder, M. Hasanuzzaman and M. Malek
Abstract
The experiment was conducted at the Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka from November, 2008 to March, 2009 to find out the allelopathic effect of Brassica biomass on weed control and growth of wheat. The treatment of the experiment consisted of 2 levels of previous field condition viz. fallow land (C1) and field with Brassica (C2); 2 levels of maturity viz. 25 days old Brassica biomass (M1) and 35 days old Brassica biomass (M2); and 3 levels of Brassica biomass concentyration viz. 0 kg biomass m−2 (B1), 0.5 kg biomass m−2 (B2) and 1.0 kg biomass m−2 (B3). The lowest dry weight of weed at 60 DAS was found from field with Brassica (45.61gm−2), 35 days old Brassica (74.58 gm−2) & 1.0 kg biomass application (65.06 g m−2). The previous Brassica field along with 1.0 kg m−2 Brassica biomass concentration showed significantly lowest result on weed population (80.33 m−2) and dry weight of weed (39.74 g m−2) and the highest plant height (33.98 cm) at 30 DAS. The lowest weed population at 30 DAS (73.33 m−2) was found in previous Brassica field with 35 days old biomass applied @ 1.0 kg m−2 whereas at 60 DAS, the lowest weed population was recorded in same field and same concentration but 25 days old biomass. Weed population and weed dry weight showed highest result in fallow land with no biomass application. Fallow land, less matured biomass and no biomass application and their interaction encouraged growth of weed and dry weight of weed that means Brassica biomass reduced weed growth in all cases of application. Weed control was quite positive with Brassica biomass. On the other hand, land with Brassica and application of 35 days old Brassica biomass @ 0.5 -1.0 kg m−2 increased growth of wheat.
A. Debnath, P. K. Biswas, M. S. A. Sarder and A. Rahman
Abstract
A field experiment was carried... more A. Debnath, P. K. Biswas, M. S. A. Sarder and A. Rahman
Abstract
A field experiment was carried out at the Agronomy Field, Sher-e-Bangla Agricultural University, Dhaka during December, 2008 to May, 2009 to study the growth and yield of inbred and hybrid rice in Boro season using mother plant and clonal tillers. The experiment consisted of two levels of treatment, viz. planting material and variety. The experiment was laid out in a split-plot design with planting material in the main plot and variety in sub-plot having three replications. Results showed that the planting material significantly influenced all the studied characters such as panicle length, unfilled grains panicle−1, total grains panicle−1, 1000-grain weight, grain:straw ratio and harvest index. Mother plant showed better performance compared to that of clonal tillers. Significantly higher grain yield (6.85 t ha−1) and straw yield (6.45 t ha−1) were obtained from the mother plant, while the lowest grain yield (4.47 t ha−1) and straw yield (4.59 t ha−1) obtained from clonal tillers. Maximum biological yield (13.31 t ha−1) was recorded from the mother plant, whereas the minimum (9.06 t ha−1) was from the clonal tillers. Variety had significant effect on all the agronomic parameters, except number of effective and ineffective tillers, total tillers, grain:straw ratio and biological yield. BRRI hybrid dhan2 produced the highest grain yield (5.92 t ha −1) but the lowest straw yield (4.97 t ha−1). Whereas BRRI dhan29 produced the lowest grain yield (4.16 t ha−1) and the highest straw yield (6.70 t ha−1). The maximum harvest index (56.50 %) was found from BRAC aloron, while the lowest (37.67 %) was from BRRI dhan29. The harvest index was 33.32 % higher in BRAC aloron compared to that of BRRI dhan29. The interaction effect of planting material and variety showed a significant variation in tillers m−2, panicle length, unfilled grains panicle−1, total grains panicle−1, 1000-grain weight, grain:straw ratio and harvest index. Clonal tillers had the potentiality to produce similar number of effective tillers m−2, grain wt. and harvest index to those of mother plant. However, the highest grain yield (7.80 t ha−1) was produced by the mother plant of hybrid variety Sonarbangla-6 and that was similar to that of the mother plant of BRRI hybrid dhan2 (7.67 t ha−1) and BRAC aloron (7.28 t ha−1)
M.B. Islam, M.H. Ali, S.M. Masum, M. Hasanuzzaman, A. Rahman, M.T. Hosain, M. S. Islam, M.P. Chow... more M.B. Islam, M.H. Ali, S.M. Masum, M. Hasanuzzaman, A. Rahman, M.T. Hosain, M. S. Islam, M.P. Chowdhury and M.I. Khalil
A field experiment was conducted at Agronomy field of Sher-e-Bangla Agricultural University (SAU), during July- December, 2010 with a view to find out the varietal performance of aman rice as affected by different methods of urea application. The experimental treatments included four varieties i.e. BR11, BRRI dhan33, BRRI dhan39, BRRI dhan46 and four urea application methods viz. 15 kg N ha-1 as prilled urea (PU) at final land preparation + 15 kg N ha-1 as PU at 30 DAT+ 15 kg N ha-1 as PU 50 DAT; 15 kgN ha-1 as PU at 7 DAT + 15 kg N ha-1 as PU at 30 DAT + 15 kg N ha-1 as PU at 50 DAT; 60 kg N ha-1 USG (1.8 g) at 7 DAT; 15 kg N ha-1 as PU at 15 DAT+ 15 kg N ha-1 as PU 30 DAT+ 15 kg N ha-1 as PU at 50 DAT. The experiment was laid out in a split-plot design with three replications having urea application in the main plots and variety in the sub-plots. The results showed that urea fertilizer application method significantly influenced plant height, tillering production, leaf area index, effective tillers hill-1, filled grains panicle-1, unfilled grains panicle-1, total grains panicle-1, 1000-grain weight, grain yield, straw yield, and biological yield. Application of USG N as at 7 DAT gave highest yield (7.82 t ha-1) while application of 15 kg N ha-1 as PU 30 DAT+ 15 kg N ha-1 as PU at 50 DAT gave lowest yield (4.88 t ha-1). Varietal influence were significant on tillering pattern, leaf area index, effective tillers hill-1, filled grains panicle- 1,1000-grain weight, grain yield, straw yield and biological yield. BR11 gave the highest yield (8.17 t ha-1) which was statistically similar with BRRI dhan46 (7.3 t ha-1) while the lowest yield obtained from BRRI dhan33 (2.87 t ha-1). Interaction effect of 1.8 g USG along with BR11 showed the highest effective tillers hill-1 (14.00), 1000-grain weight (30.32 g), grain yield
Mohammad Malek, Md. Jafar Ullah, Md. Hazrat Ali, Sheikh Muhammad Masum and Anisur Rahman
ABSTR... more Mohammad Malek, Md. Jafar Ullah, Md. Hazrat Ali, Sheikh Muhammad Masum and Anisur Rahman
ABSTRACT
An experiment on the performance of wheat-lentil mixed cropping under different seed rates of both wheat and lentil (100%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20% and 10%, respectively) was conducted at the Agronomy Field, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh. The experiment was laid out in a randomized complete block design with three replications. Results showed that significantly higher yields of wheat (3.14, 2.92, 2.88 and 2.84 t ha−1, respectively) were obtained with the treatment of sole wheat, wheat 90% + lentil 10%, wheat 80% + lentil 20% and wheat 70% + lentil 30%. Significantly the highest combined yield of 3.21 t ha−1 was obtained with the treatment of wheat 70% + lentil 30%. The highest land equivalent ratio, benefit-cost ratio and total net return of 1.30, 2.14 and Tk. 61026.75 ha−1, respectively were obtained with the treatment of wheat 70% + lentil 30%. It was concluded that lentil may be intercropped with wheat using the combination of 70% wheat seed rate + 30% lentil seed rate.
M. T. Azam, M. H. Ali, M. F. Karim, A. Rahman, J. Jalal and A. F. M. Mamun
ABSTRACT
A fi... more M. T. Azam, M. H. Ali, M. F. Karim, A. Rahman, J. Jalal and A. F. M. Mamun
ABSTRACT
A field experiment was conducted at at the agronomy field of Sher-e-Bangla Agricultural University, Dhaka during with the objectives to find out the Influence of different urea fertilizer application method on growth and yield of boro rice’. The experiment was carried out in split-plot design with three replications having three variety viz. (i) V1 = ACI Hybrid dhan 1, (ii) V2 = BRRI dhan29 and (iii) V3 = BRRI hybrid dhan2 in main plot and four urea application method viz. (i) T1 = 2.7 g size USG placement at 8 DAT, (ii) T2 = 1.8 g size USG placement at 8 DAT + Prilled urea plot−1 (75 g for V1 and V3 and 45 g for V2) at 30 DAT, (iii) T3 =1.8 g size USG placement at 8 DAT + foliar spray plot−1 (75 g for V1 and V3 and 45 g for V2) at 30 DAT and (iv) T4 = 0.9 g size USG placement at 8 DAT + Prilled urea plot−1 (37.5 g for V1 and V3 and 22.5 g V2) at 30 DAT + foliar spray plot−1 (37.5 g for V1 and V3 and 22.5 g for V2) at 50 DAT. Result showed that variety and urea fertilizer application method had significant effect on plant height, tillers hill−1, dry weight hill−1, leaf area index, grain panicle−1, 1000 grain weight, grain yield, straw yield and harvest index. BRRI hybrid dhan2 (V3) showed the highest plant height (108 cm), number of tillers hill−1 (23.98), dry weight hill−1 (84.14 g), leaf area index (7.12), grains panicle−1 (131.20), 1000 grain weight (26.12 g), grain yield (4.79 t ha−1), straw yield (6.80 t ha−1), biological yield (11.6 t ha−1) and harvest index (41.25%) at harvest. With different methods of urea application T1 gave the highest number of tillers hill−1 (24.67), dry weight hill−1 (83.22 g), leaf area index (6.83), grains panicle−1 (128.2), 1000 grain weight (25.73 g), grain yield (4.67 t ha−1), straw yield (6.72 t ha−1), biological yield (11.39 t ha−1) and harvest index (40.66%). With the combined effect of different boro rice variety and methods of urea application the highest number of tillers hill−1 (28.00 at harvest), dry weight hill−1 (90.59 g at harvest), leaf area index (7.87 at harvest), grains panicle−1 (146.20), 1000 grain weight (26.79 g), grain yield (5.41 t ha−1), straw yield (7.20 t ha−1), biological yield (12.61 t ha−1) was at V3T1. So, V3T1 (BRRI hybrid dhan2 × 2.7 g size USG placement at 8 DAT) was the best treatment under the present study.
J. Roy, P. K. Biswas, M. H. Ali and Anisur Rahman
ABSTRACT
A field experiment was conducted a... more J. Roy, P. K. Biswas, M. H. Ali and Anisur Rahman
ABSTRACT
A field experiment was conducted at the agronomy field of Sher-e-Bangla Agricultural University; Dhaka during with the objectives to find out the influence of sowing depth and population density on the yield contributes and yield of wheat. The experiment was carried out in split-plot design with three replications having three sowing depths viz. 2 cm, 4 cm and 6 cm in main plot and 6 population densities viz. 100 seeds m−2, 200 seeds m−2, 300 seeds m−2, 400 seeds m−2, 500 seeds m−2 and 600 seeds m−2 in the sub plot. Result showed that sowing depth had significant influence on number of spikes m−2, length of spike, number of grains spike−1, grain yield and straw yield. Population densities had significant effect on number of spikes m−2, length of spike, number of grains spike−1, grain yield, straw yield and harvest index. The result also revealed that 4 cm sowing depth showed best performance in case of grain and straw yield. The highest grain yield (3.01 t ha−1) and straw yield (6.26 t ha−1) was obtained from 4 cm sowing depth. Highest grain yield (3.36 t ha−1) was also produced from 300 seeds m−2 treatment, whereas, 100 seeds m−2 treatment produced the lowest grain yield (2.29 t ha−1). The highest straw yield was observed with 400 seeds m−2 and the lowest from 100 seeds m−2. The highest harvest index was recorded with 100 seeds m−2. Among the interaction treatments, the sowing depth of 2 cm and 300 seeds m−2 produced the highest grain yield of 3.72 t ha−1.
U. Jabin, M.F. Karim, M.J. Ullah, M. Hasanuzzaman, S.M. Masum and Anisur Rahman
ABSTRACT
The... more U. Jabin, M.F. Karim, M.J. Ullah, M. Hasanuzzaman, S.M. Masum and Anisur Rahman
ABSTRACT
The field experiment was conducted at the Agronomy field of Sher-e-Bangla Agricultural University, Dhaka during Rabi season (October- February) 2009-2010 to study the influence of application method of prilled urea and urea suppergranule on yield of mustard. The treatments comprised of T1= Prilled Urea (PU) broadcasted (conventional method), T2=PU given in the side furrows, T3= PU given between two rows, T4=PU and seed given in the same furrows, T5=Urea Super Granules (USG) placed at 5 cm depth as basal, T6=USG placed at 5 cm depth at 10 days after sowing (DAS), T7=USG placed at 5 cm depth at 20 DAS, T8=USG placed at 5 cm depth at 30 DAS, T9=USG placed at 10 cm depth as basal, T10=USG placed at 10 cm depth at 10 DAS, T11=USG placed at 10 cm depth at 20 DAS, T12=USG placed at 10 cm depth at 30 DAS, T13=USG placed at 15 cm depth as basal, T14=USG placed at 15 cm depth at 10 DAS, T15=USG placed at 15 cm depth at 20 DAS and T16=USG placed at 15 cm depth at 30 DAS. Results showed that USG placed at 5 cm depth at 20 DAS gave the highest branches plant−1 (6.86), siliquae plant−1 (58.60), seeds siliqua−1 (32.00), 1000 grain weight (3.56 g) which reflected in higher values of seed yield (3.59 t ha−1), biological yield (6.78 t ha−1) and harvest index (52.62%) compared to PU application. Use of USG had two fold advantages over conventional use of PU. It out yielded PU by 39.14% when this method required about 52.38% less urea than the amount of PU was used.
M. A. Al-Mamun, P. K. Biswas, M. F. Karim, M. Hasanuzzaman* and A. Rahman
Abstract
The experime... more M. A. Al-Mamun, P. K. Biswas, M. F. Karim, M. Hasanuzzaman* and A. Rahman
Abstract
The experiment was conducted at the Agronomy fi eld, Sher-e-Bangla Agricultural
University, Dhaka from November, 2009 to May, 2010 to fi nd out the effect of rice
straw and water hyacinth incorporation into the soil on the performance of boro rice.
The treatments of the experiment consisted of two rice varieties viz., BRRI dhan29
and BRRI hybrid dhan2, two biomass materials viz., rice straw and water hyacinth;
and three levels of biomass concentration viz., control (no biomass), 0.5 kg biomass
m-2 and 1.0 kg biomass m-2. The experiment was laid out in a double split plot design
with three replications having varieties in the main plot, biomass materials in the sub
plot and concentrations in the sub sub-plot. Signifi cantly higher grain yield of rice (6.90
t ha-1) and harvest index (49.27) was obtained from BRRI hybrid dhan2 as compared
to BRRI dhan29 (6.08 t ha-1 and 41.27) , however, signifi cantly higher straw yield
(8.64 t ha-1) was registered with the latter variety.
Hydroponically grown 12-day-old rice (Oryza sativa L. cv. BRRI dhan47) seedlings were exposed to ... more Hydroponically grown 12-day-old rice (Oryza sativa L. cv. BRRI dhan47) seedlings were exposed to 150 mM NaCl alone and combined with 0.5 mM MnSO 4. Salt stress resulted in disruption of ion homeostasis by Na ? influx and K ? efflux. Higher accumulation of Na ? and water imbalance under salinity caused osmotic stress, chlorosis, and growth inhibition. Salt-induced ionic toxicity and osmotic stress consequently resulted in oxidative stress by disrupting the antioxidant defense and glyoxalase systems through overproduction of reactive oxygen species (ROS) and methylglyoxal (MG), respectively. The salt-induced damage increased with the increasing duration of stress. However, exogenous application of manganese (Mn) helped the plants to partially recover from the inhibited growth and chlorosis by improving ionic and osmotic homeostasis through decreasing Na ? influx and increasing water status, respectively. Exogenous application of Mn increased ROS detoxification by increasing the content of the phenolic compounds, flavonoids, and ascorbate (AsA), and increasing the activities of monode-hydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), superoxide dismutase (SOD), and catalase (CAT) in the salt-treated seedlings. Supplemental Mn also reinforced MG detoxification by increasing the activities of glyoxalase I (Gly I) and glyoxalase II (Gly II) in the salt-affected seedlings. Thus, exogenous application of Mn conferred salt-stress tolerance through the coordinated action of ion homeostasis and the antioxidant defense and glyoxalase systems in the salt-affected seedlings.
The present study was undertaken to investigate the regulatory role of exogenous application of c... more The present study was undertaken to investigate the regulatory role of exogenous application of calcium (Ca) in enhancing the antioxidant defense and glyoxalase systems in mitigating cadmium (Cd) stress in rice. Hydroponically grown fourteen-day-old rice (Oryza sativa L. cv. BRRI dhan29) seedlings were exposed to 0.25 and 0.5 mM CdCl2 alone and in combination with 2.5 mM CaCl2 for three days. Exposure to Cd caused chlorosis, leaf rolling symptoms, and growth inhibition. A higher concentration of Cd in the growth medium resulted in higher Cd accumulation, which induced oxidative stress through overproduction of reactive oxygen species (ROS) by disrupting the antioxidant defense system. Cadmium treatment increased the methylglyoxal (MG) level. Calcium supplementation in the Cd-treated growth medium reduced Cd uptake. Application of Ca also significantly increased the (ascorbate) AsA content, increased the activities of superoxide dismutase (SOD), catalase (CAT), glutathione S-transferase (GST), monodehydroascorbate reductase (MDHAR) and dehydroascorbate reductase (DHAR) in the antioxidant system, and increased the glyoxalase I (Gly I) and glyoxalase II (Gly II) activities in the glyoxalase system in rice seedlings exposed to both levels of Cd. Exogenous Ca regulates the antioxidant defense and glyoxalase systems, which reverses overproduced ROS and detoxifies methylglyoxal, which in turn reduces Cd toxicity.
The effect of exogenous calcium (Ca) on hydroponically grown rice seedlings was studied under ars... more The effect of exogenous calcium (Ca) on hydroponically grown rice seedlings was studied under arsenic (As) stress by investigating the antioxidant and glyoxalase systems. Fourteen-day-old rice (Oryza sativa L. cv. BRRI dhan29) seedlings were exposed to 0.5 and 1 mM Na2HAsO4 (As) alone and in combination with 10 mM CaCl2 (Ca) for 5 days. Both levels of As caused growth inhibition, chlorosis, reduced leaf RWC, and increased As accumulation in the rice seedlings. Both doses of As in growth medium induced oxidative stress through overproduction of reactive oxygen species (ROS) by disrupting the antioxidant defense and glyoxalase systems. Exogenous application of Ca along with both levels of As significantly decreased As accumulation and restored plant growth and water loss. Calcium supplementation in the As-exposed rice seedlings reduced ROS production, increased ascorbate (AsA) content, and increased the activities of monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), catalase (CAT), glutathione peroxidase (GPX), superoxide dismutase (SOD), and the glyoxalase I (Gly I) and glyoxalase II (Gly II) enzymes compared with seedlings exposed to As only. These results suggest that Ca supplementation improves rice seedling tolerance to As-induced oxidative stress by reducing As uptake, enhancing their antioxidant defense and glyoxalase systems, and also by improving growth and physiological condition.
A field experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh duri... more A field experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during aman season with a view to find out the yield potential of transplant aromatic rice varieties under different weed control strategies. The experiment was carried out with four varieties i.e. BRRI dhan34, BRRI dhan37, BRRI dhan50 and Chinigura in the main plot and five weed controlstrategies viz. control (no weeding), one hand weeding at 15DAT, two hand weeding 15DAT + 40DAT, Topstar® 400SC (Oxadiargyl 400 g L-1) @ 100 g ha-1 as post-emergence and Sunrice® 150WG (Ethoxysulfuron 150 g kg-1) @ 185 ml ha-1 as pre-emergence herbicide in the sub plot in split plot design. The result showed that BRRI dhan34 gave highest (3.16 t ha-1) and BRRI dhan50 produced lowest grain yield (1.88 t ha-1). Sunrice® 150WG as pre-emergence herbicide controlled weeds very successfully which performed better in response of yield contributing characters of rice. Application of Sunrice® 150WG achieved highest grain yield which was 50.73%, 32.07%, 11.95% and 5.25% higher than the yield obtained from control, one hand weeding, two hand weeding and Topstar® 400SC treated plots, respectively. The interaction of BRRI dhan34 in combination with Sunrice® 150WG produced the highest grain yield (4.10 t ha-1) while lowest grain yield (1.44 t ha-1) was obtained from BRRI dhan50 in control treatment.
Mirza Hasanuzzaman,1 Md. Mahabub Alam,2 Anisur Rahman,1,2 Md. Hasanuzzaman,1
Kamrun Nahar,2,3 an... more Mirza Hasanuzzaman,1 Md. Mahabub Alam,2 Anisur Rahman,1,2 Md. Hasanuzzaman,1
Kamrun Nahar,2,3 andMasayuki Fujita2
Abstract
The present study investigates the roles of exogenous proline (Pro, 5mM) and glycine betaine (GB, 5mM) in improving salt stress tolerance in salt sensitive (BRRI dhan49) and salt tolerant (BRRI dhan54) rice (Oryza sativa L.) varieties. Salt stresses (150 and 300mM NaCl for 48 h) significantly reduced leaf relative water (RWC) and chlorophyll (chl) content and increased endogenous Pro and increased lipid peroxidation and H2O2 levels. Ascorbate (AsA), glutathione (GSH) and GSH/GSSG, ascorbate peroxidae (APX),monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), glutathione reductase (GR), glutathione peroxidase (GPX), catalase (CAT), and glyoxalase I (Gly I) activities were reduced in sensitive variety and these were increased in tolerant variety due to salt stress. The glyoxalase II (Gly II), glutathione S-transferase (GST), and superoxide dismutase (SOD) activities were increased in both cultivars by salt stress. Exogenous Pro and GB application with salt stress improved physiological parameters and reduced oxidative damage in both cultivars where BRRI dhan54 showed better tolerance. The result suggests that exogenous application of Pro and GB increased rice seedlings’ tolerance to salt-induced oxidative damage by upregulating their antioxidant defense system where these protectants rendered better performance to BRRI dhan54 and Pro can be considered as better protectant than GB.
A. Rahman, P. K. Biswas, M. S. A. Sarder and M. I. K. Khan
ABSTRACT
The experiment was conduc... more A. Rahman, P. K. Biswas, M. S. A. Sarder and M. I. K. Khan
ABSTRACT
The experiment was conducted at the Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka from November, 2008 to March, 2009 to study the allelopathic effect of Brassica biomass on weed control and yield of wheat. The treatment of the experiment consisted of 3 factors as: 2 levels of field status viz. fallow land and field with Brassica; 2 levels of age viz. 25 days old Brassica and 35 days old Brassica; and 3 levels of Brassica biomass amount viz. 0 kg biomass m−2, 0.5 kg biomass m−2 and 1.0 kg biomass m−2. The highest grain yield was found from Brassica grown fields (2.68 t ha−1), 35 days old Brassica biomass (2.59 t ha−1) & 1.0 kg m−2 biomass application (2.71 t ha−1). The interaction effect of field status and Brassica biomass amount showed significant result on effective tillers linear m−1 (84.67), spike length (16.09 cm), filled grain spike−1 (50.93), weight of 1000 grains (41.22 g), grain yield (2.83 t ha−1) and straw yield (4.08 t ha−1). The highest thousand grain weight (41.84 g) was found from the field with 35 days old Brassica application @ 0.50 kg m−2. The maximum grain yield (2.86 t ha−1) was found from the field with 35 days old Brassica biomass application @ 1.0 kg m−2. Land with Brassica and application of 35 days old Brassica biomass @ 0.5−1.0 kg m−2 increased yield contributing characters and yield of wheat.
M. J. Jalal, M. J. Ullah, H. M. M. T. Hossain and A. Rahman
Abstract
The experiment was conduct... more M. J. Jalal, M. J. Ullah, H. M. M. T. Hossain and A. Rahman
Abstract
The experiment was conducted at the Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka from June, 2008 to December, 2008 to study the yield performance of aman rice with storage durations of uprooted rice seedlings at different ages. The experiment comprised three factors viz. A. Variety (2): BRRI dhan31 and BRRI dhan34, B. Seedling age (2): 30 days old seedlings and 40 days old seedlings and C. Storage durations (4): 0, 2, 4 and 6 days after uprooting. The experiment was laid out in Randomized Complete Block Design (Factorial) with three replications. Results indicated that BRRI dhan31 produced significantly higher number of effective tillers hill−1, weight of 1000-grains, grain yield (4.41 t ha−1), straw yield and harvest index. The results also revealed that 30 days old seedlings showed better performance than 40 days old ones in respect of the longer panicle (26.64 cm), higher number of total grains panicle−1 (160.26), number of filled grains panicle−1 (134.84), weight of 1000-grain (20.22 g) and grain yield (4.38 t ha−1). Among the storage durations of uprooted rice seedlings, 0 days storage durations showed best performance in respect of total grains panicle−1 (158.86), filled grains panicle−1 (138.54), 1000-grain weight (20.62 g), grain yield (3.98 t ha−1), straw yield (6.68 t ha−1) and harvest index (37.33%). BRRI dhan31 with 30 days old seedlings stored for up to 4 days and 40 days old seedlings stored for 2 days statistically showed no yield loss.
A. Rahman, P. K. Biswas, M. S. A. Sarder, M. Hasanuzzaman and M. Malek
Abstract
The experiment ... more A. Rahman, P. K. Biswas, M. S. A. Sarder, M. Hasanuzzaman and M. Malek
Abstract
The experiment was conducted at the Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka from November, 2008 to March, 2009 to find out the allelopathic effect of Brassica biomass on weed control and growth of wheat. The treatment of the experiment consisted of 2 levels of previous field condition viz. fallow land (C1) and field with Brassica (C2); 2 levels of maturity viz. 25 days old Brassica biomass (M1) and 35 days old Brassica biomass (M2); and 3 levels of Brassica biomass concentyration viz. 0 kg biomass m−2 (B1), 0.5 kg biomass m−2 (B2) and 1.0 kg biomass m−2 (B3). The lowest dry weight of weed at 60 DAS was found from field with Brassica (45.61gm−2), 35 days old Brassica (74.58 gm−2) & 1.0 kg biomass application (65.06 g m−2). The previous Brassica field along with 1.0 kg m−2 Brassica biomass concentration showed significantly lowest result on weed population (80.33 m−2) and dry weight of weed (39.74 g m−2) and the highest plant height (33.98 cm) at 30 DAS. The lowest weed population at 30 DAS (73.33 m−2) was found in previous Brassica field with 35 days old biomass applied @ 1.0 kg m−2 whereas at 60 DAS, the lowest weed population was recorded in same field and same concentration but 25 days old biomass. Weed population and weed dry weight showed highest result in fallow land with no biomass application. Fallow land, less matured biomass and no biomass application and their interaction encouraged growth of weed and dry weight of weed that means Brassica biomass reduced weed growth in all cases of application. Weed control was quite positive with Brassica biomass. On the other hand, land with Brassica and application of 35 days old Brassica biomass @ 0.5 -1.0 kg m−2 increased growth of wheat.
A. Debnath, P. K. Biswas, M. S. A. Sarder and A. Rahman
Abstract
A field experiment was carried... more A. Debnath, P. K. Biswas, M. S. A. Sarder and A. Rahman
Abstract
A field experiment was carried out at the Agronomy Field, Sher-e-Bangla Agricultural University, Dhaka during December, 2008 to May, 2009 to study the growth and yield of inbred and hybrid rice in Boro season using mother plant and clonal tillers. The experiment consisted of two levels of treatment, viz. planting material and variety. The experiment was laid out in a split-plot design with planting material in the main plot and variety in sub-plot having three replications. Results showed that the planting material significantly influenced all the studied characters such as panicle length, unfilled grains panicle−1, total grains panicle−1, 1000-grain weight, grain:straw ratio and harvest index. Mother plant showed better performance compared to that of clonal tillers. Significantly higher grain yield (6.85 t ha−1) and straw yield (6.45 t ha−1) were obtained from the mother plant, while the lowest grain yield (4.47 t ha−1) and straw yield (4.59 t ha−1) obtained from clonal tillers. Maximum biological yield (13.31 t ha−1) was recorded from the mother plant, whereas the minimum (9.06 t ha−1) was from the clonal tillers. Variety had significant effect on all the agronomic parameters, except number of effective and ineffective tillers, total tillers, grain:straw ratio and biological yield. BRRI hybrid dhan2 produced the highest grain yield (5.92 t ha −1) but the lowest straw yield (4.97 t ha−1). Whereas BRRI dhan29 produced the lowest grain yield (4.16 t ha−1) and the highest straw yield (6.70 t ha−1). The maximum harvest index (56.50 %) was found from BRAC aloron, while the lowest (37.67 %) was from BRRI dhan29. The harvest index was 33.32 % higher in BRAC aloron compared to that of BRRI dhan29. The interaction effect of planting material and variety showed a significant variation in tillers m−2, panicle length, unfilled grains panicle−1, total grains panicle−1, 1000-grain weight, grain:straw ratio and harvest index. Clonal tillers had the potentiality to produce similar number of effective tillers m−2, grain wt. and harvest index to those of mother plant. However, the highest grain yield (7.80 t ha−1) was produced by the mother plant of hybrid variety Sonarbangla-6 and that was similar to that of the mother plant of BRRI hybrid dhan2 (7.67 t ha−1) and BRAC aloron (7.28 t ha−1)
M.B. Islam, M.H. Ali, S.M. Masum, M. Hasanuzzaman, A. Rahman, M.T. Hosain, M. S. Islam, M.P. Chow... more M.B. Islam, M.H. Ali, S.M. Masum, M. Hasanuzzaman, A. Rahman, M.T. Hosain, M. S. Islam, M.P. Chowdhury and M.I. Khalil
A field experiment was conducted at Agronomy field of Sher-e-Bangla Agricultural University (SAU), during July- December, 2010 with a view to find out the varietal performance of aman rice as affected by different methods of urea application. The experimental treatments included four varieties i.e. BR11, BRRI dhan33, BRRI dhan39, BRRI dhan46 and four urea application methods viz. 15 kg N ha-1 as prilled urea (PU) at final land preparation + 15 kg N ha-1 as PU at 30 DAT+ 15 kg N ha-1 as PU 50 DAT; 15 kgN ha-1 as PU at 7 DAT + 15 kg N ha-1 as PU at 30 DAT + 15 kg N ha-1 as PU at 50 DAT; 60 kg N ha-1 USG (1.8 g) at 7 DAT; 15 kg N ha-1 as PU at 15 DAT+ 15 kg N ha-1 as PU 30 DAT+ 15 kg N ha-1 as PU at 50 DAT. The experiment was laid out in a split-plot design with three replications having urea application in the main plots and variety in the sub-plots. The results showed that urea fertilizer application method significantly influenced plant height, tillering production, leaf area index, effective tillers hill-1, filled grains panicle-1, unfilled grains panicle-1, total grains panicle-1, 1000-grain weight, grain yield, straw yield, and biological yield. Application of USG N as at 7 DAT gave highest yield (7.82 t ha-1) while application of 15 kg N ha-1 as PU 30 DAT+ 15 kg N ha-1 as PU at 50 DAT gave lowest yield (4.88 t ha-1). Varietal influence were significant on tillering pattern, leaf area index, effective tillers hill-1, filled grains panicle- 1,1000-grain weight, grain yield, straw yield and biological yield. BR11 gave the highest yield (8.17 t ha-1) which was statistically similar with BRRI dhan46 (7.3 t ha-1) while the lowest yield obtained from BRRI dhan33 (2.87 t ha-1). Interaction effect of 1.8 g USG along with BR11 showed the highest effective tillers hill-1 (14.00), 1000-grain weight (30.32 g), grain yield
Mohammad Malek, Md. Jafar Ullah, Md. Hazrat Ali, Sheikh Muhammad Masum and Anisur Rahman
ABSTR... more Mohammad Malek, Md. Jafar Ullah, Md. Hazrat Ali, Sheikh Muhammad Masum and Anisur Rahman
ABSTRACT
An experiment on the performance of wheat-lentil mixed cropping under different seed rates of both wheat and lentil (100%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20% and 10%, respectively) was conducted at the Agronomy Field, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh. The experiment was laid out in a randomized complete block design with three replications. Results showed that significantly higher yields of wheat (3.14, 2.92, 2.88 and 2.84 t ha−1, respectively) were obtained with the treatment of sole wheat, wheat 90% + lentil 10%, wheat 80% + lentil 20% and wheat 70% + lentil 30%. Significantly the highest combined yield of 3.21 t ha−1 was obtained with the treatment of wheat 70% + lentil 30%. The highest land equivalent ratio, benefit-cost ratio and total net return of 1.30, 2.14 and Tk. 61026.75 ha−1, respectively were obtained with the treatment of wheat 70% + lentil 30%. It was concluded that lentil may be intercropped with wheat using the combination of 70% wheat seed rate + 30% lentil seed rate.
M. T. Azam, M. H. Ali, M. F. Karim, A. Rahman, J. Jalal and A. F. M. Mamun
ABSTRACT
A fi... more M. T. Azam, M. H. Ali, M. F. Karim, A. Rahman, J. Jalal and A. F. M. Mamun
ABSTRACT
A field experiment was conducted at at the agronomy field of Sher-e-Bangla Agricultural University, Dhaka during with the objectives to find out the Influence of different urea fertilizer application method on growth and yield of boro rice’. The experiment was carried out in split-plot design with three replications having three variety viz. (i) V1 = ACI Hybrid dhan 1, (ii) V2 = BRRI dhan29 and (iii) V3 = BRRI hybrid dhan2 in main plot and four urea application method viz. (i) T1 = 2.7 g size USG placement at 8 DAT, (ii) T2 = 1.8 g size USG placement at 8 DAT + Prilled urea plot−1 (75 g for V1 and V3 and 45 g for V2) at 30 DAT, (iii) T3 =1.8 g size USG placement at 8 DAT + foliar spray plot−1 (75 g for V1 and V3 and 45 g for V2) at 30 DAT and (iv) T4 = 0.9 g size USG placement at 8 DAT + Prilled urea plot−1 (37.5 g for V1 and V3 and 22.5 g V2) at 30 DAT + foliar spray plot−1 (37.5 g for V1 and V3 and 22.5 g for V2) at 50 DAT. Result showed that variety and urea fertilizer application method had significant effect on plant height, tillers hill−1, dry weight hill−1, leaf area index, grain panicle−1, 1000 grain weight, grain yield, straw yield and harvest index. BRRI hybrid dhan2 (V3) showed the highest plant height (108 cm), number of tillers hill−1 (23.98), dry weight hill−1 (84.14 g), leaf area index (7.12), grains panicle−1 (131.20), 1000 grain weight (26.12 g), grain yield (4.79 t ha−1), straw yield (6.80 t ha−1), biological yield (11.6 t ha−1) and harvest index (41.25%) at harvest. With different methods of urea application T1 gave the highest number of tillers hill−1 (24.67), dry weight hill−1 (83.22 g), leaf area index (6.83), grains panicle−1 (128.2), 1000 grain weight (25.73 g), grain yield (4.67 t ha−1), straw yield (6.72 t ha−1), biological yield (11.39 t ha−1) and harvest index (40.66%). With the combined effect of different boro rice variety and methods of urea application the highest number of tillers hill−1 (28.00 at harvest), dry weight hill−1 (90.59 g at harvest), leaf area index (7.87 at harvest), grains panicle−1 (146.20), 1000 grain weight (26.79 g), grain yield (5.41 t ha−1), straw yield (7.20 t ha−1), biological yield (12.61 t ha−1) was at V3T1. So, V3T1 (BRRI hybrid dhan2 × 2.7 g size USG placement at 8 DAT) was the best treatment under the present study.
J. Roy, P. K. Biswas, M. H. Ali and Anisur Rahman
ABSTRACT
A field experiment was conducted a... more J. Roy, P. K. Biswas, M. H. Ali and Anisur Rahman
ABSTRACT
A field experiment was conducted at the agronomy field of Sher-e-Bangla Agricultural University; Dhaka during with the objectives to find out the influence of sowing depth and population density on the yield contributes and yield of wheat. The experiment was carried out in split-plot design with three replications having three sowing depths viz. 2 cm, 4 cm and 6 cm in main plot and 6 population densities viz. 100 seeds m−2, 200 seeds m−2, 300 seeds m−2, 400 seeds m−2, 500 seeds m−2 and 600 seeds m−2 in the sub plot. Result showed that sowing depth had significant influence on number of spikes m−2, length of spike, number of grains spike−1, grain yield and straw yield. Population densities had significant effect on number of spikes m−2, length of spike, number of grains spike−1, grain yield, straw yield and harvest index. The result also revealed that 4 cm sowing depth showed best performance in case of grain and straw yield. The highest grain yield (3.01 t ha−1) and straw yield (6.26 t ha−1) was obtained from 4 cm sowing depth. Highest grain yield (3.36 t ha−1) was also produced from 300 seeds m−2 treatment, whereas, 100 seeds m−2 treatment produced the lowest grain yield (2.29 t ha−1). The highest straw yield was observed with 400 seeds m−2 and the lowest from 100 seeds m−2. The highest harvest index was recorded with 100 seeds m−2. Among the interaction treatments, the sowing depth of 2 cm and 300 seeds m−2 produced the highest grain yield of 3.72 t ha−1.
U. Jabin, M.F. Karim, M.J. Ullah, M. Hasanuzzaman, S.M. Masum and Anisur Rahman
ABSTRACT
The... more U. Jabin, M.F. Karim, M.J. Ullah, M. Hasanuzzaman, S.M. Masum and Anisur Rahman
ABSTRACT
The field experiment was conducted at the Agronomy field of Sher-e-Bangla Agricultural University, Dhaka during Rabi season (October- February) 2009-2010 to study the influence of application method of prilled urea and urea suppergranule on yield of mustard. The treatments comprised of T1= Prilled Urea (PU) broadcasted (conventional method), T2=PU given in the side furrows, T3= PU given between two rows, T4=PU and seed given in the same furrows, T5=Urea Super Granules (USG) placed at 5 cm depth as basal, T6=USG placed at 5 cm depth at 10 days after sowing (DAS), T7=USG placed at 5 cm depth at 20 DAS, T8=USG placed at 5 cm depth at 30 DAS, T9=USG placed at 10 cm depth as basal, T10=USG placed at 10 cm depth at 10 DAS, T11=USG placed at 10 cm depth at 20 DAS, T12=USG placed at 10 cm depth at 30 DAS, T13=USG placed at 15 cm depth as basal, T14=USG placed at 15 cm depth at 10 DAS, T15=USG placed at 15 cm depth at 20 DAS and T16=USG placed at 15 cm depth at 30 DAS. Results showed that USG placed at 5 cm depth at 20 DAS gave the highest branches plant−1 (6.86), siliquae plant−1 (58.60), seeds siliqua−1 (32.00), 1000 grain weight (3.56 g) which reflected in higher values of seed yield (3.59 t ha−1), biological yield (6.78 t ha−1) and harvest index (52.62%) compared to PU application. Use of USG had two fold advantages over conventional use of PU. It out yielded PU by 39.14% when this method required about 52.38% less urea than the amount of PU was used.
M. A. Al-Mamun, P. K. Biswas, M. F. Karim, M. Hasanuzzaman* and A. Rahman
Abstract
The experime... more M. A. Al-Mamun, P. K. Biswas, M. F. Karim, M. Hasanuzzaman* and A. Rahman
Abstract
The experiment was conducted at the Agronomy fi eld, Sher-e-Bangla Agricultural
University, Dhaka from November, 2009 to May, 2010 to fi nd out the effect of rice
straw and water hyacinth incorporation into the soil on the performance of boro rice.
The treatments of the experiment consisted of two rice varieties viz., BRRI dhan29
and BRRI hybrid dhan2, two biomass materials viz., rice straw and water hyacinth;
and three levels of biomass concentration viz., control (no biomass), 0.5 kg biomass
m-2 and 1.0 kg biomass m-2. The experiment was laid out in a double split plot design
with three replications having varieties in the main plot, biomass materials in the sub
plot and concentrations in the sub sub-plot. Signifi cantly higher grain yield of rice (6.90
t ha-1) and harvest index (49.27) was obtained from BRRI hybrid dhan2 as compared
to BRRI dhan29 (6.08 t ha-1 and 41.27) , however, signifi cantly higher straw yield
(8.64 t ha-1) was registered with the latter variety.
Uploads
Papers by Anisur Rahman
Kamrun Nahar,2,3 andMasayuki Fujita2
Abstract
The present study investigates the roles of exogenous proline (Pro, 5mM) and glycine betaine (GB, 5mM) in improving salt stress tolerance in salt sensitive (BRRI dhan49) and salt tolerant (BRRI dhan54) rice (Oryza sativa L.) varieties. Salt stresses (150 and 300mM NaCl for 48 h) significantly reduced leaf relative water (RWC) and chlorophyll (chl) content and increased endogenous Pro and increased lipid peroxidation and H2O2 levels. Ascorbate (AsA), glutathione (GSH) and GSH/GSSG, ascorbate peroxidae (APX),monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), glutathione reductase (GR), glutathione peroxidase (GPX), catalase (CAT), and glyoxalase I (Gly I) activities were reduced in sensitive variety and these were increased in tolerant variety due to salt stress. The glyoxalase II (Gly II), glutathione S-transferase (GST), and superoxide dismutase (SOD) activities were increased in both cultivars by salt stress. Exogenous Pro and GB application with salt stress improved physiological parameters and reduced oxidative damage in both cultivars where BRRI dhan54 showed better tolerance. The result suggests that exogenous application of Pro and GB increased rice seedlings’ tolerance to salt-induced oxidative damage by upregulating their antioxidant defense system where these protectants rendered better performance to BRRI dhan54 and Pro can be considered as better protectant than GB.
ABSTRACT
The experiment was conducted at the Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka from November, 2008 to March, 2009 to study the allelopathic effect of Brassica biomass on weed control and yield of wheat. The treatment of the experiment consisted of 3 factors as: 2 levels of field status viz. fallow land and field with Brassica; 2 levels of age viz. 25 days old Brassica and 35 days old Brassica; and 3 levels of Brassica biomass amount viz. 0 kg biomass m−2, 0.5 kg biomass m−2 and 1.0 kg biomass m−2. The highest grain yield was found from Brassica grown fields (2.68 t ha−1), 35 days old Brassica biomass (2.59 t ha−1) & 1.0 kg m−2 biomass application (2.71 t ha−1). The interaction effect of field status and Brassica biomass amount showed significant result on effective tillers linear m−1 (84.67), spike length (16.09 cm), filled grain spike−1 (50.93), weight of 1000 grains (41.22 g), grain yield (2.83 t ha−1) and straw yield (4.08 t ha−1). The highest thousand grain weight (41.84 g) was found from the field with 35 days old Brassica application @ 0.50 kg m−2. The maximum grain yield (2.86 t ha−1) was found from the field with 35 days old Brassica biomass application @ 1.0 kg m−2. Land with Brassica and application of 35 days old Brassica biomass @ 0.5−1.0 kg m−2 increased yield contributing characters and yield of wheat.
Abstract
The experiment was conducted at the Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka from June, 2008 to December, 2008 to study the yield performance of aman rice with storage durations of uprooted rice seedlings at different ages. The experiment comprised three factors viz. A. Variety (2): BRRI dhan31 and BRRI dhan34, B. Seedling age (2): 30 days old seedlings and 40 days old seedlings and C. Storage durations (4): 0, 2, 4 and 6 days after uprooting. The experiment was laid out in Randomized Complete Block Design (Factorial) with three replications. Results indicated that BRRI dhan31 produced significantly higher number of effective tillers hill−1, weight of 1000-grains, grain yield (4.41 t ha−1), straw yield and harvest index. The results also revealed that 30 days old seedlings showed better performance than 40 days old ones in respect of the longer panicle (26.64 cm), higher number of total grains panicle−1 (160.26), number of filled grains panicle−1 (134.84), weight of 1000-grain (20.22 g) and grain yield (4.38 t ha−1). Among the storage durations of uprooted rice seedlings, 0 days storage durations showed best performance in respect of total grains panicle−1 (158.86), filled grains panicle−1 (138.54), 1000-grain weight (20.62 g), grain yield (3.98 t ha−1), straw yield (6.68 t ha−1) and harvest index (37.33%). BRRI dhan31 with 30 days old seedlings stored for up to 4 days and 40 days old seedlings stored for 2 days statistically showed no yield loss.
Abstract
The experiment was conducted at the Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka from November, 2008 to March, 2009 to find out the allelopathic effect of Brassica biomass on weed control and growth of wheat. The treatment of the experiment consisted of 2 levels of previous field condition viz. fallow land (C1) and field with Brassica (C2); 2 levels of maturity viz. 25 days old Brassica biomass (M1) and 35 days old Brassica biomass (M2); and 3 levels of Brassica biomass concentyration viz. 0 kg biomass m−2 (B1), 0.5 kg biomass m−2 (B2) and 1.0 kg biomass m−2 (B3). The lowest dry weight of weed at 60 DAS was found from field with Brassica (45.61gm−2), 35 days old Brassica (74.58 gm−2) & 1.0 kg biomass application (65.06 g m−2). The previous Brassica field along with 1.0 kg m−2 Brassica biomass concentration showed significantly lowest result on weed population (80.33 m−2) and dry weight of weed (39.74 g m−2) and the highest plant height (33.98 cm) at 30 DAS. The lowest weed population at 30 DAS (73.33 m−2) was found in previous Brassica field with 35 days old biomass applied @ 1.0 kg m−2 whereas at 60 DAS, the lowest weed population was recorded in same field and same concentration but 25 days old biomass. Weed population and weed dry weight showed highest result in fallow land with no biomass application. Fallow land, less matured biomass and no biomass application and their interaction encouraged growth of weed and dry weight of weed that means Brassica biomass reduced weed growth in all cases of application. Weed control was quite positive with Brassica biomass. On the other hand, land with Brassica and application of 35 days old Brassica biomass @ 0.5 -1.0 kg m−2 increased growth of wheat.
Abstract
A field experiment was carried out at the Agronomy Field, Sher-e-Bangla Agricultural University, Dhaka during December, 2008 to May, 2009 to study the growth and yield of inbred and hybrid rice in Boro season using mother plant and clonal tillers. The experiment consisted of two levels of treatment, viz. planting material and variety. The experiment was laid out in a split-plot design with planting material in the main plot and variety in sub-plot having three replications. Results showed that the planting material significantly influenced all the studied characters such as panicle length, unfilled grains panicle−1, total grains panicle−1, 1000-grain weight, grain:straw ratio and harvest index. Mother plant showed better performance compared to that of clonal tillers. Significantly higher grain yield (6.85 t ha−1) and straw yield (6.45 t ha−1) were obtained from the mother plant, while the lowest grain yield (4.47 t ha−1) and straw yield (4.59 t ha−1) obtained from clonal tillers. Maximum biological yield (13.31 t ha−1) was recorded from the mother plant, whereas the minimum (9.06 t ha−1) was from the clonal tillers. Variety had significant effect on all the agronomic parameters, except number of effective and ineffective tillers, total tillers, grain:straw ratio and biological yield. BRRI hybrid dhan2 produced the highest grain yield (5.92 t ha −1) but the lowest straw yield (4.97 t ha−1). Whereas BRRI dhan29 produced the lowest grain yield (4.16 t ha−1) and the highest straw yield (6.70 t ha−1). The maximum harvest index (56.50 %) was found from BRAC aloron, while the lowest (37.67 %) was from BRRI dhan29. The harvest index was 33.32 % higher in BRAC aloron compared to that of BRRI dhan29. The interaction effect of planting material and variety showed a significant variation in tillers m−2, panicle length, unfilled grains panicle−1, total grains panicle−1, 1000-grain weight, grain:straw ratio and harvest index. Clonal tillers had the potentiality to produce similar number of effective tillers m−2, grain wt. and harvest index to those of mother plant. However, the highest grain yield (7.80 t ha−1) was produced by the mother plant of hybrid variety Sonarbangla-6 and that was similar to that of the mother plant of BRRI hybrid dhan2 (7.67 t ha−1) and BRAC aloron (7.28 t ha−1)
A field experiment was conducted at Agronomy field of Sher-e-Bangla Agricultural University (SAU), during July- December, 2010 with a view to find out the varietal performance of aman rice as affected by different methods of urea application. The experimental treatments included four varieties i.e. BR11, BRRI dhan33, BRRI dhan39, BRRI dhan46 and four urea application methods viz. 15 kg N ha-1 as prilled urea (PU) at final land preparation + 15 kg N ha-1 as PU at 30 DAT+ 15 kg N ha-1 as PU 50 DAT; 15 kgN ha-1 as PU at 7 DAT + 15 kg N ha-1 as PU at 30 DAT + 15 kg N ha-1 as PU at 50 DAT; 60 kg N ha-1 USG (1.8 g) at 7 DAT; 15 kg N ha-1 as PU at 15 DAT+ 15 kg N ha-1 as PU 30 DAT+ 15 kg N ha-1 as PU at 50 DAT. The experiment was laid out in a split-plot design with three replications having urea application in the main plots and variety in the sub-plots. The results showed that urea fertilizer application method significantly influenced plant height, tillering production, leaf area index, effective tillers hill-1, filled grains panicle-1, unfilled grains panicle-1, total grains panicle-1, 1000-grain weight, grain yield, straw yield, and biological yield. Application of USG N as at 7 DAT gave highest yield (7.82 t ha-1) while application of 15 kg N ha-1 as PU 30 DAT+ 15 kg N ha-1 as PU at 50 DAT gave lowest yield (4.88 t ha-1). Varietal influence were significant on tillering pattern, leaf area index, effective tillers hill-1, filled grains panicle- 1,1000-grain weight, grain yield, straw yield and biological yield. BR11 gave the highest yield (8.17 t ha-1) which was statistically similar with BRRI dhan46 (7.3 t ha-1) while the lowest yield obtained from BRRI dhan33 (2.87 t ha-1). Interaction effect of 1.8 g USG along with BR11 showed the highest effective tillers hill-1 (14.00), 1000-grain weight (30.32 g), grain yield
ABSTRACT
An experiment on the performance of wheat-lentil mixed cropping under different seed rates of both wheat and lentil (100%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20% and 10%, respectively) was conducted at the Agronomy Field, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh. The experiment was laid out in a randomized complete block design with three replications. Results showed that significantly higher yields of wheat (3.14, 2.92, 2.88 and 2.84 t ha−1, respectively) were obtained with the treatment of sole wheat, wheat 90% + lentil 10%, wheat 80% + lentil 20% and wheat 70% + lentil 30%. Significantly the highest combined yield of 3.21 t ha−1 was obtained with the treatment of wheat 70% + lentil 30%. The highest land equivalent ratio, benefit-cost ratio and total net return of 1.30, 2.14 and Tk. 61026.75 ha−1, respectively were obtained with the treatment of wheat 70% + lentil 30%. It was concluded that lentil may be intercropped with wheat using the combination of 70% wheat seed rate + 30% lentil seed rate.
ABSTRACT
A field experiment was conducted at at the agronomy field of Sher-e-Bangla Agricultural University, Dhaka during with the objectives to find out the Influence of different urea fertilizer application method on growth and yield of boro rice’. The experiment was carried out in split-plot design with three replications having three variety viz. (i) V1 = ACI Hybrid dhan 1, (ii) V2 = BRRI dhan29 and (iii) V3 = BRRI hybrid dhan2 in main plot and four urea application method viz. (i) T1 = 2.7 g size USG placement at 8 DAT, (ii) T2 = 1.8 g size USG placement at 8 DAT + Prilled urea plot−1 (75 g for V1 and V3 and 45 g for V2) at 30 DAT, (iii) T3 =1.8 g size USG placement at 8 DAT + foliar spray plot−1 (75 g for V1 and V3 and 45 g for V2) at 30 DAT and (iv) T4 = 0.9 g size USG placement at 8 DAT + Prilled urea plot−1 (37.5 g for V1 and V3 and 22.5 g V2) at 30 DAT + foliar spray plot−1 (37.5 g for V1 and V3 and 22.5 g for V2) at 50 DAT. Result showed that variety and urea fertilizer application method had significant effect on plant height, tillers hill−1, dry weight hill−1, leaf area index, grain panicle−1, 1000 grain weight, grain yield, straw yield and harvest index. BRRI hybrid dhan2 (V3) showed the highest plant height (108 cm), number of tillers hill−1 (23.98), dry weight hill−1 (84.14 g), leaf area index (7.12), grains panicle−1 (131.20), 1000 grain weight (26.12 g), grain yield (4.79 t ha−1), straw yield (6.80 t ha−1), biological yield (11.6 t ha−1) and harvest index (41.25%) at harvest. With different methods of urea application T1 gave the highest number of tillers hill−1 (24.67), dry weight hill−1 (83.22 g), leaf area index (6.83), grains panicle−1 (128.2), 1000 grain weight (25.73 g), grain yield (4.67 t ha−1), straw yield (6.72 t ha−1), biological yield (11.39 t ha−1) and harvest index (40.66%). With the combined effect of different boro rice variety and methods of urea application the highest number of tillers hill−1 (28.00 at harvest), dry weight hill−1 (90.59 g at harvest), leaf area index (7.87 at harvest), grains panicle−1 (146.20), 1000 grain weight (26.79 g), grain yield (5.41 t ha−1), straw yield (7.20 t ha−1), biological yield (12.61 t ha−1) was at V3T1. So, V3T1 (BRRI hybrid dhan2 × 2.7 g size USG placement at 8 DAT) was the best treatment under the present study.
ABSTRACT
A field experiment was conducted at the agronomy field of Sher-e-Bangla Agricultural University; Dhaka during with the objectives to find out the influence of sowing depth and population density on the yield contributes and yield of wheat. The experiment was carried out in split-plot design with three replications having three sowing depths viz. 2 cm, 4 cm and 6 cm in main plot and 6 population densities viz. 100 seeds m−2, 200 seeds m−2, 300 seeds m−2, 400 seeds m−2, 500 seeds m−2 and 600 seeds m−2 in the sub plot. Result showed that sowing depth had significant influence on number of spikes m−2, length of spike, number of grains spike−1, grain yield and straw yield. Population densities had significant effect on number of spikes m−2, length of spike, number of grains spike−1, grain yield, straw yield and harvest index. The result also revealed that 4 cm sowing depth showed best performance in case of grain and straw yield. The highest grain yield (3.01 t ha−1) and straw yield (6.26 t ha−1) was obtained from 4 cm sowing depth. Highest grain yield (3.36 t ha−1) was also produced from 300 seeds m−2 treatment, whereas, 100 seeds m−2 treatment produced the lowest grain yield (2.29 t ha−1). The highest straw yield was observed with 400 seeds m−2 and the lowest from 100 seeds m−2. The highest harvest index was recorded with 100 seeds m−2. Among the interaction treatments, the sowing depth of 2 cm and 300 seeds m−2 produced the highest grain yield of 3.72 t ha−1.
ABSTRACT
The field experiment was conducted at the Agronomy field of Sher-e-Bangla Agricultural University, Dhaka during Rabi season (October- February) 2009-2010 to study the influence of application method of prilled urea and urea suppergranule on yield of mustard. The treatments comprised of T1= Prilled Urea (PU) broadcasted (conventional method), T2=PU given in the side furrows, T3= PU given between two rows, T4=PU and seed given in the same furrows, T5=Urea Super Granules (USG) placed at 5 cm depth as basal, T6=USG placed at 5 cm depth at 10 days after sowing (DAS), T7=USG placed at 5 cm depth at 20 DAS, T8=USG placed at 5 cm depth at 30 DAS, T9=USG placed at 10 cm depth as basal, T10=USG placed at 10 cm depth at 10 DAS, T11=USG placed at 10 cm depth at 20 DAS, T12=USG placed at 10 cm depth at 30 DAS, T13=USG placed at 15 cm depth as basal, T14=USG placed at 15 cm depth at 10 DAS, T15=USG placed at 15 cm depth at 20 DAS and T16=USG placed at 15 cm depth at 30 DAS. Results showed that USG placed at 5 cm depth at 20 DAS gave the highest branches plant−1 (6.86), siliquae plant−1 (58.60), seeds siliqua−1 (32.00), 1000 grain weight (3.56 g) which reflected in higher values of seed yield (3.59 t ha−1), biological yield (6.78 t ha−1) and harvest index (52.62%) compared to PU application. Use of USG had two fold advantages over conventional use of PU. It out yielded PU by 39.14% when this method required about 52.38% less urea than the amount of PU was used.
Abstract
The experiment was conducted at the Agronomy fi eld, Sher-e-Bangla Agricultural
University, Dhaka from November, 2009 to May, 2010 to fi nd out the effect of rice
straw and water hyacinth incorporation into the soil on the performance of boro rice.
The treatments of the experiment consisted of two rice varieties viz., BRRI dhan29
and BRRI hybrid dhan2, two biomass materials viz., rice straw and water hyacinth;
and three levels of biomass concentration viz., control (no biomass), 0.5 kg biomass
m-2 and 1.0 kg biomass m-2. The experiment was laid out in a double split plot design
with three replications having varieties in the main plot, biomass materials in the sub
plot and concentrations in the sub sub-plot. Signifi cantly higher grain yield of rice (6.90
t ha-1) and harvest index (49.27) was obtained from BRRI hybrid dhan2 as compared
to BRRI dhan29 (6.08 t ha-1 and 41.27) , however, signifi cantly higher straw yield
(8.64 t ha-1) was registered with the latter variety.
Kamrun Nahar,2,3 andMasayuki Fujita2
Abstract
The present study investigates the roles of exogenous proline (Pro, 5mM) and glycine betaine (GB, 5mM) in improving salt stress tolerance in salt sensitive (BRRI dhan49) and salt tolerant (BRRI dhan54) rice (Oryza sativa L.) varieties. Salt stresses (150 and 300mM NaCl for 48 h) significantly reduced leaf relative water (RWC) and chlorophyll (chl) content and increased endogenous Pro and increased lipid peroxidation and H2O2 levels. Ascorbate (AsA), glutathione (GSH) and GSH/GSSG, ascorbate peroxidae (APX),monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), glutathione reductase (GR), glutathione peroxidase (GPX), catalase (CAT), and glyoxalase I (Gly I) activities were reduced in sensitive variety and these were increased in tolerant variety due to salt stress. The glyoxalase II (Gly II), glutathione S-transferase (GST), and superoxide dismutase (SOD) activities were increased in both cultivars by salt stress. Exogenous Pro and GB application with salt stress improved physiological parameters and reduced oxidative damage in both cultivars where BRRI dhan54 showed better tolerance. The result suggests that exogenous application of Pro and GB increased rice seedlings’ tolerance to salt-induced oxidative damage by upregulating their antioxidant defense system where these protectants rendered better performance to BRRI dhan54 and Pro can be considered as better protectant than GB.
ABSTRACT
The experiment was conducted at the Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka from November, 2008 to March, 2009 to study the allelopathic effect of Brassica biomass on weed control and yield of wheat. The treatment of the experiment consisted of 3 factors as: 2 levels of field status viz. fallow land and field with Brassica; 2 levels of age viz. 25 days old Brassica and 35 days old Brassica; and 3 levels of Brassica biomass amount viz. 0 kg biomass m−2, 0.5 kg biomass m−2 and 1.0 kg biomass m−2. The highest grain yield was found from Brassica grown fields (2.68 t ha−1), 35 days old Brassica biomass (2.59 t ha−1) & 1.0 kg m−2 biomass application (2.71 t ha−1). The interaction effect of field status and Brassica biomass amount showed significant result on effective tillers linear m−1 (84.67), spike length (16.09 cm), filled grain spike−1 (50.93), weight of 1000 grains (41.22 g), grain yield (2.83 t ha−1) and straw yield (4.08 t ha−1). The highest thousand grain weight (41.84 g) was found from the field with 35 days old Brassica application @ 0.50 kg m−2. The maximum grain yield (2.86 t ha−1) was found from the field with 35 days old Brassica biomass application @ 1.0 kg m−2. Land with Brassica and application of 35 days old Brassica biomass @ 0.5−1.0 kg m−2 increased yield contributing characters and yield of wheat.
Abstract
The experiment was conducted at the Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka from June, 2008 to December, 2008 to study the yield performance of aman rice with storage durations of uprooted rice seedlings at different ages. The experiment comprised three factors viz. A. Variety (2): BRRI dhan31 and BRRI dhan34, B. Seedling age (2): 30 days old seedlings and 40 days old seedlings and C. Storage durations (4): 0, 2, 4 and 6 days after uprooting. The experiment was laid out in Randomized Complete Block Design (Factorial) with three replications. Results indicated that BRRI dhan31 produced significantly higher number of effective tillers hill−1, weight of 1000-grains, grain yield (4.41 t ha−1), straw yield and harvest index. The results also revealed that 30 days old seedlings showed better performance than 40 days old ones in respect of the longer panicle (26.64 cm), higher number of total grains panicle−1 (160.26), number of filled grains panicle−1 (134.84), weight of 1000-grain (20.22 g) and grain yield (4.38 t ha−1). Among the storage durations of uprooted rice seedlings, 0 days storage durations showed best performance in respect of total grains panicle−1 (158.86), filled grains panicle−1 (138.54), 1000-grain weight (20.62 g), grain yield (3.98 t ha−1), straw yield (6.68 t ha−1) and harvest index (37.33%). BRRI dhan31 with 30 days old seedlings stored for up to 4 days and 40 days old seedlings stored for 2 days statistically showed no yield loss.
Abstract
The experiment was conducted at the Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka from November, 2008 to March, 2009 to find out the allelopathic effect of Brassica biomass on weed control and growth of wheat. The treatment of the experiment consisted of 2 levels of previous field condition viz. fallow land (C1) and field with Brassica (C2); 2 levels of maturity viz. 25 days old Brassica biomass (M1) and 35 days old Brassica biomass (M2); and 3 levels of Brassica biomass concentyration viz. 0 kg biomass m−2 (B1), 0.5 kg biomass m−2 (B2) and 1.0 kg biomass m−2 (B3). The lowest dry weight of weed at 60 DAS was found from field with Brassica (45.61gm−2), 35 days old Brassica (74.58 gm−2) & 1.0 kg biomass application (65.06 g m−2). The previous Brassica field along with 1.0 kg m−2 Brassica biomass concentration showed significantly lowest result on weed population (80.33 m−2) and dry weight of weed (39.74 g m−2) and the highest plant height (33.98 cm) at 30 DAS. The lowest weed population at 30 DAS (73.33 m−2) was found in previous Brassica field with 35 days old biomass applied @ 1.0 kg m−2 whereas at 60 DAS, the lowest weed population was recorded in same field and same concentration but 25 days old biomass. Weed population and weed dry weight showed highest result in fallow land with no biomass application. Fallow land, less matured biomass and no biomass application and their interaction encouraged growth of weed and dry weight of weed that means Brassica biomass reduced weed growth in all cases of application. Weed control was quite positive with Brassica biomass. On the other hand, land with Brassica and application of 35 days old Brassica biomass @ 0.5 -1.0 kg m−2 increased growth of wheat.
Abstract
A field experiment was carried out at the Agronomy Field, Sher-e-Bangla Agricultural University, Dhaka during December, 2008 to May, 2009 to study the growth and yield of inbred and hybrid rice in Boro season using mother plant and clonal tillers. The experiment consisted of two levels of treatment, viz. planting material and variety. The experiment was laid out in a split-plot design with planting material in the main plot and variety in sub-plot having three replications. Results showed that the planting material significantly influenced all the studied characters such as panicle length, unfilled grains panicle−1, total grains panicle−1, 1000-grain weight, grain:straw ratio and harvest index. Mother plant showed better performance compared to that of clonal tillers. Significantly higher grain yield (6.85 t ha−1) and straw yield (6.45 t ha−1) were obtained from the mother plant, while the lowest grain yield (4.47 t ha−1) and straw yield (4.59 t ha−1) obtained from clonal tillers. Maximum biological yield (13.31 t ha−1) was recorded from the mother plant, whereas the minimum (9.06 t ha−1) was from the clonal tillers. Variety had significant effect on all the agronomic parameters, except number of effective and ineffective tillers, total tillers, grain:straw ratio and biological yield. BRRI hybrid dhan2 produced the highest grain yield (5.92 t ha −1) but the lowest straw yield (4.97 t ha−1). Whereas BRRI dhan29 produced the lowest grain yield (4.16 t ha−1) and the highest straw yield (6.70 t ha−1). The maximum harvest index (56.50 %) was found from BRAC aloron, while the lowest (37.67 %) was from BRRI dhan29. The harvest index was 33.32 % higher in BRAC aloron compared to that of BRRI dhan29. The interaction effect of planting material and variety showed a significant variation in tillers m−2, panicle length, unfilled grains panicle−1, total grains panicle−1, 1000-grain weight, grain:straw ratio and harvest index. Clonal tillers had the potentiality to produce similar number of effective tillers m−2, grain wt. and harvest index to those of mother plant. However, the highest grain yield (7.80 t ha−1) was produced by the mother plant of hybrid variety Sonarbangla-6 and that was similar to that of the mother plant of BRRI hybrid dhan2 (7.67 t ha−1) and BRAC aloron (7.28 t ha−1)
A field experiment was conducted at Agronomy field of Sher-e-Bangla Agricultural University (SAU), during July- December, 2010 with a view to find out the varietal performance of aman rice as affected by different methods of urea application. The experimental treatments included four varieties i.e. BR11, BRRI dhan33, BRRI dhan39, BRRI dhan46 and four urea application methods viz. 15 kg N ha-1 as prilled urea (PU) at final land preparation + 15 kg N ha-1 as PU at 30 DAT+ 15 kg N ha-1 as PU 50 DAT; 15 kgN ha-1 as PU at 7 DAT + 15 kg N ha-1 as PU at 30 DAT + 15 kg N ha-1 as PU at 50 DAT; 60 kg N ha-1 USG (1.8 g) at 7 DAT; 15 kg N ha-1 as PU at 15 DAT+ 15 kg N ha-1 as PU 30 DAT+ 15 kg N ha-1 as PU at 50 DAT. The experiment was laid out in a split-plot design with three replications having urea application in the main plots and variety in the sub-plots. The results showed that urea fertilizer application method significantly influenced plant height, tillering production, leaf area index, effective tillers hill-1, filled grains panicle-1, unfilled grains panicle-1, total grains panicle-1, 1000-grain weight, grain yield, straw yield, and biological yield. Application of USG N as at 7 DAT gave highest yield (7.82 t ha-1) while application of 15 kg N ha-1 as PU 30 DAT+ 15 kg N ha-1 as PU at 50 DAT gave lowest yield (4.88 t ha-1). Varietal influence were significant on tillering pattern, leaf area index, effective tillers hill-1, filled grains panicle- 1,1000-grain weight, grain yield, straw yield and biological yield. BR11 gave the highest yield (8.17 t ha-1) which was statistically similar with BRRI dhan46 (7.3 t ha-1) while the lowest yield obtained from BRRI dhan33 (2.87 t ha-1). Interaction effect of 1.8 g USG along with BR11 showed the highest effective tillers hill-1 (14.00), 1000-grain weight (30.32 g), grain yield
ABSTRACT
An experiment on the performance of wheat-lentil mixed cropping under different seed rates of both wheat and lentil (100%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20% and 10%, respectively) was conducted at the Agronomy Field, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh. The experiment was laid out in a randomized complete block design with three replications. Results showed that significantly higher yields of wheat (3.14, 2.92, 2.88 and 2.84 t ha−1, respectively) were obtained with the treatment of sole wheat, wheat 90% + lentil 10%, wheat 80% + lentil 20% and wheat 70% + lentil 30%. Significantly the highest combined yield of 3.21 t ha−1 was obtained with the treatment of wheat 70% + lentil 30%. The highest land equivalent ratio, benefit-cost ratio and total net return of 1.30, 2.14 and Tk. 61026.75 ha−1, respectively were obtained with the treatment of wheat 70% + lentil 30%. It was concluded that lentil may be intercropped with wheat using the combination of 70% wheat seed rate + 30% lentil seed rate.
ABSTRACT
A field experiment was conducted at at the agronomy field of Sher-e-Bangla Agricultural University, Dhaka during with the objectives to find out the Influence of different urea fertilizer application method on growth and yield of boro rice’. The experiment was carried out in split-plot design with three replications having three variety viz. (i) V1 = ACI Hybrid dhan 1, (ii) V2 = BRRI dhan29 and (iii) V3 = BRRI hybrid dhan2 in main plot and four urea application method viz. (i) T1 = 2.7 g size USG placement at 8 DAT, (ii) T2 = 1.8 g size USG placement at 8 DAT + Prilled urea plot−1 (75 g for V1 and V3 and 45 g for V2) at 30 DAT, (iii) T3 =1.8 g size USG placement at 8 DAT + foliar spray plot−1 (75 g for V1 and V3 and 45 g for V2) at 30 DAT and (iv) T4 = 0.9 g size USG placement at 8 DAT + Prilled urea plot−1 (37.5 g for V1 and V3 and 22.5 g V2) at 30 DAT + foliar spray plot−1 (37.5 g for V1 and V3 and 22.5 g for V2) at 50 DAT. Result showed that variety and urea fertilizer application method had significant effect on plant height, tillers hill−1, dry weight hill−1, leaf area index, grain panicle−1, 1000 grain weight, grain yield, straw yield and harvest index. BRRI hybrid dhan2 (V3) showed the highest plant height (108 cm), number of tillers hill−1 (23.98), dry weight hill−1 (84.14 g), leaf area index (7.12), grains panicle−1 (131.20), 1000 grain weight (26.12 g), grain yield (4.79 t ha−1), straw yield (6.80 t ha−1), biological yield (11.6 t ha−1) and harvest index (41.25%) at harvest. With different methods of urea application T1 gave the highest number of tillers hill−1 (24.67), dry weight hill−1 (83.22 g), leaf area index (6.83), grains panicle−1 (128.2), 1000 grain weight (25.73 g), grain yield (4.67 t ha−1), straw yield (6.72 t ha−1), biological yield (11.39 t ha−1) and harvest index (40.66%). With the combined effect of different boro rice variety and methods of urea application the highest number of tillers hill−1 (28.00 at harvest), dry weight hill−1 (90.59 g at harvest), leaf area index (7.87 at harvest), grains panicle−1 (146.20), 1000 grain weight (26.79 g), grain yield (5.41 t ha−1), straw yield (7.20 t ha−1), biological yield (12.61 t ha−1) was at V3T1. So, V3T1 (BRRI hybrid dhan2 × 2.7 g size USG placement at 8 DAT) was the best treatment under the present study.
ABSTRACT
A field experiment was conducted at the agronomy field of Sher-e-Bangla Agricultural University; Dhaka during with the objectives to find out the influence of sowing depth and population density on the yield contributes and yield of wheat. The experiment was carried out in split-plot design with three replications having three sowing depths viz. 2 cm, 4 cm and 6 cm in main plot and 6 population densities viz. 100 seeds m−2, 200 seeds m−2, 300 seeds m−2, 400 seeds m−2, 500 seeds m−2 and 600 seeds m−2 in the sub plot. Result showed that sowing depth had significant influence on number of spikes m−2, length of spike, number of grains spike−1, grain yield and straw yield. Population densities had significant effect on number of spikes m−2, length of spike, number of grains spike−1, grain yield, straw yield and harvest index. The result also revealed that 4 cm sowing depth showed best performance in case of grain and straw yield. The highest grain yield (3.01 t ha−1) and straw yield (6.26 t ha−1) was obtained from 4 cm sowing depth. Highest grain yield (3.36 t ha−1) was also produced from 300 seeds m−2 treatment, whereas, 100 seeds m−2 treatment produced the lowest grain yield (2.29 t ha−1). The highest straw yield was observed with 400 seeds m−2 and the lowest from 100 seeds m−2. The highest harvest index was recorded with 100 seeds m−2. Among the interaction treatments, the sowing depth of 2 cm and 300 seeds m−2 produced the highest grain yield of 3.72 t ha−1.
ABSTRACT
The field experiment was conducted at the Agronomy field of Sher-e-Bangla Agricultural University, Dhaka during Rabi season (October- February) 2009-2010 to study the influence of application method of prilled urea and urea suppergranule on yield of mustard. The treatments comprised of T1= Prilled Urea (PU) broadcasted (conventional method), T2=PU given in the side furrows, T3= PU given between two rows, T4=PU and seed given in the same furrows, T5=Urea Super Granules (USG) placed at 5 cm depth as basal, T6=USG placed at 5 cm depth at 10 days after sowing (DAS), T7=USG placed at 5 cm depth at 20 DAS, T8=USG placed at 5 cm depth at 30 DAS, T9=USG placed at 10 cm depth as basal, T10=USG placed at 10 cm depth at 10 DAS, T11=USG placed at 10 cm depth at 20 DAS, T12=USG placed at 10 cm depth at 30 DAS, T13=USG placed at 15 cm depth as basal, T14=USG placed at 15 cm depth at 10 DAS, T15=USG placed at 15 cm depth at 20 DAS and T16=USG placed at 15 cm depth at 30 DAS. Results showed that USG placed at 5 cm depth at 20 DAS gave the highest branches plant−1 (6.86), siliquae plant−1 (58.60), seeds siliqua−1 (32.00), 1000 grain weight (3.56 g) which reflected in higher values of seed yield (3.59 t ha−1), biological yield (6.78 t ha−1) and harvest index (52.62%) compared to PU application. Use of USG had two fold advantages over conventional use of PU. It out yielded PU by 39.14% when this method required about 52.38% less urea than the amount of PU was used.
Abstract
The experiment was conducted at the Agronomy fi eld, Sher-e-Bangla Agricultural
University, Dhaka from November, 2009 to May, 2010 to fi nd out the effect of rice
straw and water hyacinth incorporation into the soil on the performance of boro rice.
The treatments of the experiment consisted of two rice varieties viz., BRRI dhan29
and BRRI hybrid dhan2, two biomass materials viz., rice straw and water hyacinth;
and three levels of biomass concentration viz., control (no biomass), 0.5 kg biomass
m-2 and 1.0 kg biomass m-2. The experiment was laid out in a double split plot design
with three replications having varieties in the main plot, biomass materials in the sub
plot and concentrations in the sub sub-plot. Signifi cantly higher grain yield of rice (6.90
t ha-1) and harvest index (49.27) was obtained from BRRI hybrid dhan2 as compared
to BRRI dhan29 (6.08 t ha-1 and 41.27) , however, signifi cantly higher straw yield
(8.64 t ha-1) was registered with the latter variety.