My research directed to ''Allelopathy and allelopathic substances of medicinal plants, Biological activity of natural products, Herbicides development from natural products, Organic farming and Precision agriculture............... Supervisors: Professor Dr Hisashi Kato-Noguchi (PhD Supervisor, JAPAN), Professor Dr ir Marc Van Meirvenne (MSc Supervisor,BELGIUM), and Professor Dr Md Abdur Rahman Sarkar (MS Supervisor, BANGLADESH) Phone: +8801718512082 Address: Department of Agronomy
Bangladesh Agricultural University
Mymensingh-2202
Bangladesh
Herbicide resistance due to the increasing reliance on herbicides is a near-term challenge for th... more Herbicide resistance due to the increasing reliance on herbicides is a near-term challenge for the world’s agriculture. This has led to a desire to develop new herbicides with a novel mode of action, to address resistance in weed species. Lamiaceae, a large dicotyledonous plant family, is very well known for the multitudinous pharmacological and toxicological properties of its member species. Moreover, many species of this family are significant for their allelopathic activity in natural and laboratory settings. Thus, plants in Lamiaceae have the potential to be sources of alternative herbicides. However, gaps in our knowledge need to be addressed prior to adopting these allelopathic activities in agriculture. Therefore, we review the existing state of knowledge about the Lamiaceae family, the reported allelopathic properties of plant extracts, and their isolated allelochemicals under laboratory, greenhouse, and field conditions. In addition, we offer a perspective on existing chall...
Grain legumes are important sources of proteins, essential micronutrients and vitamins and for hu... more Grain legumes are important sources of proteins, essential micronutrients and vitamins and for human nutrition. Climate change, including drought, is a severe threat to grain legume production throughout the world. In this review, the morpho-physiological, physio-biochemical and molecular levels of drought stress in legumes are described. Moreover, different tolerance mechanisms, such as the morphological, physio-biochemical and molecular mechanisms of legumes, are also reviewed. Moreover, various management approaches for mitigating the drought stress effects in grain legumes are assessed. Reduced leaf area, shoot and root growth, chlorophyll content, stomatal conductance, CO2 influx, nutrient uptake and translocation, and water-use efficiency (WUE) ultimately affect legume yields. The yield loss of grain legumes varies from species to species, even variety to variety within a species, depending upon the severity of drought stress and several other factors, such as phenology, soil ...
Journal of the Bangladesh Agricultural University, 2019
Growing two or more cultivars of same crop species in mixture reduces intra-specific competition ... more Growing two or more cultivars of same crop species in mixture reduces intra-specific competition for natural resources and increases competitive ability of crops against weeds and thus enhances crop yield. The objective of this study was to evaluate the potentiality of growing rice cultivars in mixtures for minimizing weed pressure and increasing rice yield. The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during Aman season (July-December) 2017. Two transplant Aman rice cultivars viz. Binadhan-13 (tall, late- maturing and fine grain aromatic cultivar) and BRRI dhan49 (semi-dwarf, mid-maturing and coarse grain cultivar) were grown following two spatial arrangements viz., alternate row and alternate hill, and nine different cultivar mixture (Binadhan-13:BRRI dhan49) row ratios viz., 1:0, 1:2, 2:1, 2:3, 3:2, 2:4, 4:2,1:1 and 0:1. The experiment was laid out in a randomized complete block design (RCBD) with three replications...
To study the response of Boro rice at differential ages of seedling and spacing under SRI method ... more To study the response of Boro rice at differential ages of seedling and spacing under SRI method two ages of seedling viz. 8 and 12-day old seedlings, and six spacing viz. 25cm×25cm, 30cm×30cm, 35cm×35cm, 40cm×40cm, 45cm×45cm and 50cm×50cm were arranged in a randomized complete block design with three replications. 12-day old seedlings exhibited better performance than that of 8-day old seedlings in respect of all crop characters, yield components and yield of BRRI dhan29 in Boro season under SRI technique. Regarding spacing 50cm×50cm was the best in respect of total tillers hill-l, effective tillers hill-1, grains panicle-1 but 25cm×25cm spacing produced the highest grain and straw yields due to more number of effective tillers m-2 and total tillers m-2, respectively. In case of interaction, 12-day old seedlings coupled with 25cm×25cm spacing appeared as the best combination in order to obtain the highest grain and straw yields in Boro season under SRI method.
A field experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural Univer... more A field experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, Aman season, 2006 to find out the influence of mustard oil cake (MOC). In the performance of fine rice Chinigura. The MOC was applied @ 0, 40, 80 and 120 kg ha-1 in three splits at basal, at 15 DAT and at 30 DAT. The experiment was laid out in a randomized complete block design with three replications. Level of mustard oil cake significantly influenced the number of effective tillers hill-1, grains panicle-1, and grain and straw yields. The highest grain yield of 2.69 t ha-1 was obtained when 80 kg MOC t ha-1 was applied, which was identical with the treatment of 120 kg MOC ha-1. This could be due to the cumulative effect of highest number of effective tillers hill-1, and number of grains panicle-1. The lowest one (1.92 t ha-1) was observed when no MOC was applied. On the other hand, application time of MOC significantly influenced all the characters except total tiller...
The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University... more The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to find out the effect of seedling storing time between uprooting and transplanting and fertilizer management on yield of Boro rice (cv. BRRI dhan29) under SRI method. Four duration of storing seedlings after uprooting viz. (i) 30 minutes (SRI recommended), (ii) two hours, (iii) four hours and (iv) eight hours; and five fertilizer management practices viz. (i) BRRI fertilizer management (120-60-40-10-5 kg N,P2O5,K2O, S, Zn ha-1, respectively), (ii) cowdung @ 10 t ha-1, (iii) poultry manure @ 5 t ha-1, (iv) 50% of BRRI recommended fertilizer + 50% of the cowdung (v) 50% BRRI recommended fertilizer + 50% of the poultry manure were included in the trial and the experiment was laid out in a randomized complete block design with three replications. Time of storing seedlings viz. 30 minutes, 2 hours, 4 hours and 8 hours did not significantly affect the grain and straw yields of Bo...
The experiment was to observe the effect of integration of fertilizer and manure on the performan... more The experiment was to observe the effect of integration of fertilizer and manure on the performance of Boro rice under the SRI method. The experiment included ten treatments of rice production method viz. conventional method (CM) with recommended dose of fertilizer (RDF); CM with cowdung (CD) @15t/ha; CM with CD @5 t/ ha+RDF; SRI+CD @15 t/ha; SRI+CD @10 t/ha; SRI+CD @ 10 t/ha+50% RDF; SRI+CD @ 5 t/ha+100% RDF; SRI+100% RDF; SRI+150% RDF; SRI+100% RDF+ biofertilizer. The results indicated that all crop characters except number of non-bearing tillers/hill, sterile spikelets/panicle and harvest index were significantly influenced due to integration of fertilizer and manure. The SRI method performed better than conventional method. Among the SRI, integration of fertilizer and manure and fertilizer more than 100% of the recommended rate produced the highest grain yield. The results showed that the best option for the cultivation of Surjomoni rice variety under SRI method during the Boro ...
Mentha sylvestris L. (Lamiaceae), a medicinal herb is well known for many pharmacological and tox... more Mentha sylvestris L. (Lamiaceae), a medicinal herb is well known for many pharmacological and toxicological properties, but very few are known yet about its allelopathic property. Hence, to investigate the allelopathy of M. sylvestris L., the aqueous methanol extracts of this plant at four different concentrations were examined on the seedling growth of cress (Lepidum sativum L.); lettuce (Lactuca sativa L.); alfalfa (Medicago sativa L.); rapeseed (Brassica napus L.); timothy (Phleum pratense L.); crabgrass (Digitaria sanguinalis L. scop.); barnyard grass (Echinochloa crus-galli L.) and Italian ryegrass (Lolium multiflorum Lam.). The hypocotyl/coleoptile growth of all test species was significantly inhibited by the plant extracts at concentrations ≥30 mg dry weight equivalent extract/mL except crabgrass, barnyard grass and Italian ryegrass. Conversely, the root growth of all but rapeseed, timothy and crabgrass was significantly inhibited at all the tested concentrations. The inhibit...
Allelopathy of Leonurus sibiricus L. (Lamiaceae) was examined against the germination of Italian ... more Allelopathy of Leonurus sibiricus L. (Lamiaceae) was examined against the germination of Italian ryegrass (Lolium multiflorum Lam.), barnyard grass (Echinochloa crus-galli L.), garden cress (Lepidum sativum L.) and lettuce (Lactuca sativa L.), and the seedling growth of Italian ryegrass, barnyard grass, timothy (Phleum pratense L.), hairy crabgrass (Digitaria sanguinalis L. scop.), garden cress, lettuce, alfalfa (Medicago sativa L.) and rapeseed (Brassica napus L.). A significant inhibition and/or delay of germination was found in Italian ryegrass, garden cress and lettuce at concentration of 100 mg dry weight equivalent extract/ml. Except the shoot and root growth of barnyard grass, all other test plant species were significantly inhibited by the plant extracts at concentrations ≥30 mg dry weight equivalent extract/ml. Inhibitory activities of the L. sibiricus extracts depended on the concentrations of the extract and test plant species. Considering the concentration required for 5...
Phytotoxic activity ofOcimum tenuiflorum(Lamiaceae) plant extracts was investigated against the g... more Phytotoxic activity ofOcimum tenuiflorum(Lamiaceae) plant extracts was investigated against the germination and seedling growth of cress (Lepidium sativum), lettuce (Lactuca sativa), alfalfa (Medicago sativa), Italian ryegrass (Lolium multiflorum), barnyard grass (Echinochloa crus-galli), and timothy (Phleum pratense) at four different concentrations. The plant extracts at concentrations greater than 30 mg dry weight equivalent extract mL−1reduced significantly the total germination percent (GP), germination index (GI), germination energy (GE), speed of emergence (SE), seedling vigour index (SVI), and coefficient of the rate of germination (CRG) of all test species except barnyard grass and GP of lettuce. In contrast, time required for 50% germination (T50) and mean germination time (MGT) were increased at the same or higher than this concentration. The increasing trend ofT50and MGT and the decreasing trend of other indices indicated a significant inhibition or delay of germination ...
Hyptis suaveolens(Lamiaceae) is an exotic invasive plant in many countries. Earlier studies repor... more Hyptis suaveolens(Lamiaceae) is an exotic invasive plant in many countries. Earlier studies reported that the aqueous, methanol, and aqueous methanol extract ofH. suaveolensand its residues have phytotoxic properties. However, to date, the phytotoxic substances of this plant have not been reported. Therefore, the objectives of this study were isolation and identification of phytotoxic substances ofH. suaveolens. Aqueous methanol extract of this plant was purified by several chromatographic runs through bioassay guided fractionation using garden cress (Lepidium sativum) as a test plant. Final purification of a phytotoxic substance was achieved by reverse phase HPLC and characterized as 14α-hydroxy-13β-abiet-8-en-18-oic acid (suaveolic acid) by high-resolution ESI-MS,1H-,13C-NMR, CD, and specific rotation. Suaveolic acid inhibited the shoot growth of garden cress, lettuce (Lactuca sativa), Italian ryegrass (Lolium multiflorum), and barnyard grass (Echinochloa crus-galli) at concentrat...
... N) and unidentified hydrolyzable N (UH-N) fractions which constitute between 28% and 34% of t... more ... N) and unidentified hydrolyzable N (UH-N) fractions which constitute between 28% and 34% of the total soil N. Very little is known about the chemical composition of these fractions except that the N in these materials is not protein N, peptide N, amino acid N, nor amino sugar N ...
ABSTRACT Different types of proximal soil sensor are used in precision agriculture to map the app... more ABSTRACT Different types of proximal soil sensor are used in precision agriculture to map the apparent soil electrical conductivity (ECa) to identify the within field soil variability. Most of the work related to map soil properties in precision agriculture has been conducted in upland crops and not a single work is reported to map the soil properties in a paddy field. Therefore, the present study was conducted to check the potentiality of EM38 proximal soil sensor to map the key soil properties of a paddy field in the alluvial plain of Bangladesh. ECa was measured by EM38 in two measurement mode viz. Horizontal and Vertical dipole mode under dry and wet conditions of the field. Almost all the topsoil (0-30 cm) properties showed no correlation with ECa. But the majority of the subsoil (30-60 cm) and all the deep soil (60-90 cm) properties show significant correlations with ECa values. However, among the measurement conditions, it is observed that EM38 in both Horizontal and Vertical dipole mode under dry condition shows higher potentiality to map the deep soil properties compare to the wet conditions.
Herbicide resistance due to the increasing reliance on herbicides is a near-term challenge for th... more Herbicide resistance due to the increasing reliance on herbicides is a near-term challenge for the world’s agriculture. This has led to a desire to develop new herbicides with a novel mode of action, to address resistance in weed species. Lamiaceae, a large dicotyledonous plant family, is very well known for the multitudinous pharmacological and toxicological properties of its member species. Moreover, many species of this family are significant for their allelopathic activity in natural and laboratory settings. Thus, plants in Lamiaceae have the potential to be sources of alternative herbicides. However, gaps in our knowledge need to be addressed prior to adopting these allelopathic activities in agriculture. Therefore, we review the existing state of knowledge about the Lamiaceae family, the reported allelopathic properties of plant extracts, and their isolated allelochemicals under laboratory, greenhouse, and field conditions. In addition, we offer a perspective on existing chall...
Grain legumes are important sources of proteins, essential micronutrients and vitamins and for hu... more Grain legumes are important sources of proteins, essential micronutrients and vitamins and for human nutrition. Climate change, including drought, is a severe threat to grain legume production throughout the world. In this review, the morpho-physiological, physio-biochemical and molecular levels of drought stress in legumes are described. Moreover, different tolerance mechanisms, such as the morphological, physio-biochemical and molecular mechanisms of legumes, are also reviewed. Moreover, various management approaches for mitigating the drought stress effects in grain legumes are assessed. Reduced leaf area, shoot and root growth, chlorophyll content, stomatal conductance, CO2 influx, nutrient uptake and translocation, and water-use efficiency (WUE) ultimately affect legume yields. The yield loss of grain legumes varies from species to species, even variety to variety within a species, depending upon the severity of drought stress and several other factors, such as phenology, soil ...
Journal of the Bangladesh Agricultural University, 2019
Growing two or more cultivars of same crop species in mixture reduces intra-specific competition ... more Growing two or more cultivars of same crop species in mixture reduces intra-specific competition for natural resources and increases competitive ability of crops against weeds and thus enhances crop yield. The objective of this study was to evaluate the potentiality of growing rice cultivars in mixtures for minimizing weed pressure and increasing rice yield. The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during Aman season (July-December) 2017. Two transplant Aman rice cultivars viz. Binadhan-13 (tall, late- maturing and fine grain aromatic cultivar) and BRRI dhan49 (semi-dwarf, mid-maturing and coarse grain cultivar) were grown following two spatial arrangements viz., alternate row and alternate hill, and nine different cultivar mixture (Binadhan-13:BRRI dhan49) row ratios viz., 1:0, 1:2, 2:1, 2:3, 3:2, 2:4, 4:2,1:1 and 0:1. The experiment was laid out in a randomized complete block design (RCBD) with three replications...
To study the response of Boro rice at differential ages of seedling and spacing under SRI method ... more To study the response of Boro rice at differential ages of seedling and spacing under SRI method two ages of seedling viz. 8 and 12-day old seedlings, and six spacing viz. 25cm×25cm, 30cm×30cm, 35cm×35cm, 40cm×40cm, 45cm×45cm and 50cm×50cm were arranged in a randomized complete block design with three replications. 12-day old seedlings exhibited better performance than that of 8-day old seedlings in respect of all crop characters, yield components and yield of BRRI dhan29 in Boro season under SRI technique. Regarding spacing 50cm×50cm was the best in respect of total tillers hill-l, effective tillers hill-1, grains panicle-1 but 25cm×25cm spacing produced the highest grain and straw yields due to more number of effective tillers m-2 and total tillers m-2, respectively. In case of interaction, 12-day old seedlings coupled with 25cm×25cm spacing appeared as the best combination in order to obtain the highest grain and straw yields in Boro season under SRI method.
A field experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural Univer... more A field experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, Aman season, 2006 to find out the influence of mustard oil cake (MOC). In the performance of fine rice Chinigura. The MOC was applied @ 0, 40, 80 and 120 kg ha-1 in three splits at basal, at 15 DAT and at 30 DAT. The experiment was laid out in a randomized complete block design with three replications. Level of mustard oil cake significantly influenced the number of effective tillers hill-1, grains panicle-1, and grain and straw yields. The highest grain yield of 2.69 t ha-1 was obtained when 80 kg MOC t ha-1 was applied, which was identical with the treatment of 120 kg MOC ha-1. This could be due to the cumulative effect of highest number of effective tillers hill-1, and number of grains panicle-1. The lowest one (1.92 t ha-1) was observed when no MOC was applied. On the other hand, application time of MOC significantly influenced all the characters except total tiller...
The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University... more The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to find out the effect of seedling storing time between uprooting and transplanting and fertilizer management on yield of Boro rice (cv. BRRI dhan29) under SRI method. Four duration of storing seedlings after uprooting viz. (i) 30 minutes (SRI recommended), (ii) two hours, (iii) four hours and (iv) eight hours; and five fertilizer management practices viz. (i) BRRI fertilizer management (120-60-40-10-5 kg N,P2O5,K2O, S, Zn ha-1, respectively), (ii) cowdung @ 10 t ha-1, (iii) poultry manure @ 5 t ha-1, (iv) 50% of BRRI recommended fertilizer + 50% of the cowdung (v) 50% BRRI recommended fertilizer + 50% of the poultry manure were included in the trial and the experiment was laid out in a randomized complete block design with three replications. Time of storing seedlings viz. 30 minutes, 2 hours, 4 hours and 8 hours did not significantly affect the grain and straw yields of Bo...
The experiment was to observe the effect of integration of fertilizer and manure on the performan... more The experiment was to observe the effect of integration of fertilizer and manure on the performance of Boro rice under the SRI method. The experiment included ten treatments of rice production method viz. conventional method (CM) with recommended dose of fertilizer (RDF); CM with cowdung (CD) @15t/ha; CM with CD @5 t/ ha+RDF; SRI+CD @15 t/ha; SRI+CD @10 t/ha; SRI+CD @ 10 t/ha+50% RDF; SRI+CD @ 5 t/ha+100% RDF; SRI+100% RDF; SRI+150% RDF; SRI+100% RDF+ biofertilizer. The results indicated that all crop characters except number of non-bearing tillers/hill, sterile spikelets/panicle and harvest index were significantly influenced due to integration of fertilizer and manure. The SRI method performed better than conventional method. Among the SRI, integration of fertilizer and manure and fertilizer more than 100% of the recommended rate produced the highest grain yield. The results showed that the best option for the cultivation of Surjomoni rice variety under SRI method during the Boro ...
Mentha sylvestris L. (Lamiaceae), a medicinal herb is well known for many pharmacological and tox... more Mentha sylvestris L. (Lamiaceae), a medicinal herb is well known for many pharmacological and toxicological properties, but very few are known yet about its allelopathic property. Hence, to investigate the allelopathy of M. sylvestris L., the aqueous methanol extracts of this plant at four different concentrations were examined on the seedling growth of cress (Lepidum sativum L.); lettuce (Lactuca sativa L.); alfalfa (Medicago sativa L.); rapeseed (Brassica napus L.); timothy (Phleum pratense L.); crabgrass (Digitaria sanguinalis L. scop.); barnyard grass (Echinochloa crus-galli L.) and Italian ryegrass (Lolium multiflorum Lam.). The hypocotyl/coleoptile growth of all test species was significantly inhibited by the plant extracts at concentrations ≥30 mg dry weight equivalent extract/mL except crabgrass, barnyard grass and Italian ryegrass. Conversely, the root growth of all but rapeseed, timothy and crabgrass was significantly inhibited at all the tested concentrations. The inhibit...
Allelopathy of Leonurus sibiricus L. (Lamiaceae) was examined against the germination of Italian ... more Allelopathy of Leonurus sibiricus L. (Lamiaceae) was examined against the germination of Italian ryegrass (Lolium multiflorum Lam.), barnyard grass (Echinochloa crus-galli L.), garden cress (Lepidum sativum L.) and lettuce (Lactuca sativa L.), and the seedling growth of Italian ryegrass, barnyard grass, timothy (Phleum pratense L.), hairy crabgrass (Digitaria sanguinalis L. scop.), garden cress, lettuce, alfalfa (Medicago sativa L.) and rapeseed (Brassica napus L.). A significant inhibition and/or delay of germination was found in Italian ryegrass, garden cress and lettuce at concentration of 100 mg dry weight equivalent extract/ml. Except the shoot and root growth of barnyard grass, all other test plant species were significantly inhibited by the plant extracts at concentrations ≥30 mg dry weight equivalent extract/ml. Inhibitory activities of the L. sibiricus extracts depended on the concentrations of the extract and test plant species. Considering the concentration required for 5...
Phytotoxic activity ofOcimum tenuiflorum(Lamiaceae) plant extracts was investigated against the g... more Phytotoxic activity ofOcimum tenuiflorum(Lamiaceae) plant extracts was investigated against the germination and seedling growth of cress (Lepidium sativum), lettuce (Lactuca sativa), alfalfa (Medicago sativa), Italian ryegrass (Lolium multiflorum), barnyard grass (Echinochloa crus-galli), and timothy (Phleum pratense) at four different concentrations. The plant extracts at concentrations greater than 30 mg dry weight equivalent extract mL−1reduced significantly the total germination percent (GP), germination index (GI), germination energy (GE), speed of emergence (SE), seedling vigour index (SVI), and coefficient of the rate of germination (CRG) of all test species except barnyard grass and GP of lettuce. In contrast, time required for 50% germination (T50) and mean germination time (MGT) were increased at the same or higher than this concentration. The increasing trend ofT50and MGT and the decreasing trend of other indices indicated a significant inhibition or delay of germination ...
Hyptis suaveolens(Lamiaceae) is an exotic invasive plant in many countries. Earlier studies repor... more Hyptis suaveolens(Lamiaceae) is an exotic invasive plant in many countries. Earlier studies reported that the aqueous, methanol, and aqueous methanol extract ofH. suaveolensand its residues have phytotoxic properties. However, to date, the phytotoxic substances of this plant have not been reported. Therefore, the objectives of this study were isolation and identification of phytotoxic substances ofH. suaveolens. Aqueous methanol extract of this plant was purified by several chromatographic runs through bioassay guided fractionation using garden cress (Lepidium sativum) as a test plant. Final purification of a phytotoxic substance was achieved by reverse phase HPLC and characterized as 14α-hydroxy-13β-abiet-8-en-18-oic acid (suaveolic acid) by high-resolution ESI-MS,1H-,13C-NMR, CD, and specific rotation. Suaveolic acid inhibited the shoot growth of garden cress, lettuce (Lactuca sativa), Italian ryegrass (Lolium multiflorum), and barnyard grass (Echinochloa crus-galli) at concentrat...
... N) and unidentified hydrolyzable N (UH-N) fractions which constitute between 28% and 34% of t... more ... N) and unidentified hydrolyzable N (UH-N) fractions which constitute between 28% and 34% of the total soil N. Very little is known about the chemical composition of these fractions except that the N in these materials is not protein N, peptide N, amino acid N, nor amino sugar N ...
ABSTRACT Different types of proximal soil sensor are used in precision agriculture to map the app... more ABSTRACT Different types of proximal soil sensor are used in precision agriculture to map the apparent soil electrical conductivity (ECa) to identify the within field soil variability. Most of the work related to map soil properties in precision agriculture has been conducted in upland crops and not a single work is reported to map the soil properties in a paddy field. Therefore, the present study was conducted to check the potentiality of EM38 proximal soil sensor to map the key soil properties of a paddy field in the alluvial plain of Bangladesh. ECa was measured by EM38 in two measurement mode viz. Horizontal and Vertical dipole mode under dry and wet conditions of the field. Almost all the topsoil (0-30 cm) properties showed no correlation with ECa. But the majority of the subsoil (30-60 cm) and all the deep soil (60-90 cm) properties show significant correlations with ECa values. However, among the measurement conditions, it is observed that EM38 in both Horizontal and Vertical dipole mode under dry condition shows higher potentiality to map the deep soil properties compare to the wet conditions.
Jatropha carcus is an important plant for the commencement of energy plantation. Jatropha can be ... more Jatropha carcus is an important plant for the commencement of energy plantation. Jatropha can be grown in marginal, degraded, waste lands in tropical and subtropical regions of the world. It is a partially domesticated plant hence development of high yielding cultivars and package of management practices needs prime importance. The most important use propagation is to produce high quality planting materials. Jatropha can propagate through seeds, cuttings and tissue culture. Due to poor seed germination, short viability and high heterozygosity seed propagation may not produce high quality planting materials. On the other hand propagation through vegetative means or micropropagation can be the most effective alternatives to produce quality seedlings with desirable traits for higher seed and oil yield. Vegetative propagation has inimitable significance to maintain homogeneity among the progeny and provide early production.
Different types of proximal soil sensor are used in precision agriculture to map the apparent soi... more Different types of proximal soil sensor are used in precision agriculture to map the apparent soil electrical conductivity (ECa) to identify the within field soil variability. Most of the work related to map soil properties in precision agriculture has been conducted in upland crops and not a single work is reported to map the soil properties in a paddy field. Therefore, the present study was conducted to check the potentiality of EM38 proximal soil sensor to map the key soil properties of a paddy field in the alluvial plain of Bangladesh. ECa was measured by EM38 in two measurement mode viz. Horizontal and Vertical dipole mode under dry and wet conditions of the field. Almost all the topsoil (0-30 cm) properties showed no correlation with ECa. But the majority of the subsoil (30-60 cm) and all the deep soil (60-90 cm) properties show significant correlations with ECa values. However, among the measurement conditions, it is observed that EM38 in both Horizontal and Vertical dipole mode under dry condition shows higher potentiality to map the deep soil properties compare to the wet conditions.
The experiment was conducted to see the effect of spacing and poultry manure (PM) based integrate... more The experiment was conducted to see the effect of spacing and poultry manure (PM) based integrated plant nutrient management in SRI method on the growth and yield of transplant aman rice. The experiment included three spacings viz. 25cm×15cm (conventional spacing), 30cm×30cm and 40cm×40cm, and seven PM based integrated fertilizer (NPKSZn) management viz. control i.e. without fertilizer, 100% NPKSZn i.e. recommended dose of fertilizer by BRRI [80, 26, 33, 11 and 2 kg/ha of N, P, K, S and Zn, respectively], 5 t/ha of PM, 50% NPKSZn+5 t/ha of PM, 50% NPKSZn+2.5 t/ha of PM, 75% NPKSZn+5 t/ha of PM and 75% NPKSZn+2.5 t/ha of PM were used. From this study it is found that both conventional spacing with 50% NPKSZn and 5 t/ha PM, and conventional spacing with BRRI recommended dose of fertilizer gives the highest grain yield. Based on the results obtained the best combination for the cultivation of BRRI dhan41 under SRI method during aman season was to use the conventional spacing×50% NPKSZn with 5 t/ha of PM to obtain the highest grain yield. Because it not only reduced the production cost but also had a long term impact on improvement of soil properties.
The experiment was to observe the effect of integration of fertilizer and manure on the performa... more The experiment was to observe the effect of integration of fertilizer and manure on the performance of Boro rice under the SRI method. The experiment included ten treatments of rice production method viz. conventional method (CM) with recommended dose of fertilizer (RDF); CM with cowdung (CD) @15t/ha; CM with CD @5 t/ ha+RDF; SRI+CD @15 t/ha; SRI+CD @10 t/ha; SRI+CD @ 10 t/ha+50% RDF; SRI+CD @ 5 t/ha+100% RDF; SRI+100% RDF; SRI+150% RDF; SRI+100% RDF+ biofertilizer. The results indicated that all crop characters except number of non-bearing tillers/hill, sterile spikelets/panicle and harvest index were significantly influenced due to integration of fertilizer and manure. The SRI method performed better than conventional method. Among the SRI, integration of fertilizer and manure and fertilizer more than 100% of the recommended rate produced the highest grain yield. The results showed that the best option for the cultivation of Surjomoni rice variety under SRI method during the Boro season was 10 t ha-1 cowdung with 50% of the RDF obtain the highest grain yield .This integration not only reduced the production cost but also had a long term impact on improvement of soil properties.
Recently the land productivity in Bangladesh is declining fast due to HYV (High Yielding Variety)... more Recently the land productivity in Bangladesh is declining fast due to HYV (High Yielding Variety) rice production, intensive cropping and indiscriminate use of fertilizers, pesticides and water irrigation. Such an extensive dependence on agrochemicals leads to various negative effects on environment and causes natural-health hazards. Ecotechnology and sustainable development concept would be very much helpful to overcome the solution. It is time to build a new paradigm of policies that can promote sustainable agriculture to help ensure food security, anchor rural development, provide resources for the livelihood and adequate incomes of a majority of people, all without destroying the environment base.
Keywords: Green revolution, crop intensification, HYV, sustainability, local varieties
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Papers by Dr. A K M Mominul Islam
Keywords: Green revolution, crop intensification, HYV, sustainability, local varieties