Purpose: Silicon established as a beneficial nutrient element especially for cereals, however it’s suitable source and optimum rate of application as a chemical fertilizer still not recommended. The purpose of the study was to identify... more
Purpose: Silicon established as a beneficial nutrient element especially for cereals, however it’s suitable source and optimum rate of application as a chemical fertilizer still not recommended. The purpose of the study was to identify the suitable source and optimum rate of silicon for growing rice at Ganges delta coastal zone soils. Methodology: Two similar succeeding field experiments: one at early monsoon season with T. Aus rice and another at monsoon season with T. Aman rice in 2021 were carried out using a two factor split plot design having replicated thrice. The first factor was three different sources of silicon (silicic acid, sodium meta silicate and calcium silicate) and second factor was seven rates of silicon (0, 1, 2, 5, 10, 20 and 40 kg Si ha-1). Results: Using a quadratic model the optimum rate of silicic acid, sodium meta silicate and calcium silicate were 32.2, 25.7 and 23.6 kg Si ha-1 for T. Aus rice, and 42.9, 25.8 and 24.5 kg Si ha-1 for T. Aman rice, respective...
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An experiment was conducted with three levels of salinity (0, 60, and 120 mM NaCl) and four levels of silicon (0, 5, 10, and 20 mM) in petridish. All the growth parameters were decreased gradually with increasing salt concentration,... more
An experiment was conducted with three levels of salinity (0, 60, and 120 mM NaCl) and four levels of silicon (0, 5, 10, and 20 mM) in petridish. All the growth parameters were decreased gradually with increasing salt concentration, whereas increasing silicon concentration progressively increased the parameters up to 10 mM Si across all the salt concentrations. The beneficial role of Si was noticed both in saline and non-saline conditions. Silicon application in the growth medium dramatically reduced shoot Na content, making plants tolerant to salt stress. J. Bangladesh Acad. Sci. 45(2); 251-253: December 2021
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A consecutive three year duration field experiment was carried out to identify which of a suitable mulch material and a planting bed or their combinations potentially reduce salt accumulation in soil and increase snake gourd yield in... more
A consecutive three year duration field experiment was carried out to identify which of a suitable mulch material and a planting bed or their combinations potentially reduce salt accumulation in soil and increase snake gourd yield in coastal saline soils. There were nine treatment combinations having three kinds of mulch materials: no mulch (control), rice straw mulch and plastic mulch, and three kinds of planting beds: convex bed, flat bed and concave bed. Plastic mulch reduced electrical conductivity of soil by 32% and increased soil temperature by 23% and gravimetric soil moisture content by 25% over control treatment. Plastic mulch had a fruit yield of 30.73, 28.06 and 26.32 t ha-1, which was 72, 237 and 268 % higher than control treatment in 2018, 2019 and 2020, respectively. The convex bed planting had significantly higher fruit yield than flat bed and concave bed planting. Plastic mulching and convex bed planting may therefore be recommended for reducing soil salinity and imp...
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Plastics are used widely everywhere in our life and without plastic, modern civilization would indeed look very diverse. This study focuses on the toxic effects of plastic on human health and environment and possible consequences of... more
Plastics are used widely everywhere in our life and without plastic, modern civilization would indeed look very diverse. This study focuses on the toxic effects of plastic on human health and environment and possible consequences of health risk assessment in Bangladesh. Plastics are essential materials in modern civilization, and many products manufactured from plastics and in numerous cases, they promote risks to human health and the environment. Plastics are contained many chemical and hazardous substances such as Bisphenol A (BPA), thalates, antiminitroxide, brominated flame retardants, and poly- fluorinated chemicals etc. which are a serious risk factor for human health and environment. Plastics are being used by Bangladeshi people without knowing the toxic effects of plastic on human health and environment. Different human health problems like irritation in the eye, vision failure, breathing difficulties, respiratory problems, liver dysfunction, cancers, skin diseases, lungs pr...
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The experiment was conducted to see the phosphorus (P) mineralization pattern of bioslurry under aerobic and anaerobic soil conditions. Two bioslurry (cowdung bioslurry and poultry manure bioslurry) and their original manure (cowdung and... more
The experiment was conducted to see the phosphorus (P) mineralization pattern of bioslurry under aerobic and anaerobic soil conditions. Two bioslurry (cowdung bioslurry and poultry manure bioslurry) and their original manure (cowdung and poultry manure) at 3, 5, 10 and 20 t ha -1 , respectively were thoroughly mixed with soil and incubated in aerobic and anaerobic moisture condition for 12 weeks. Among the four different types of manure, P release from poultry manure slurry was the highest. Poultry manure and cowdung slurry recorded very closer amount of available P. Both cowdung slurry and poultry manure slurry released higher amount of P compared to their original state (cowdung and poultry manure). P mineralization reaches in peak within 4-6 weeks of incubation. Under anaerobic condition the P mineralization was found higher compared to aerobic condition. The P mineralization data fitted strongly to the first order kinetic model. The bioslurries had lower rate of mineralization b...
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Salinity intrusion is one of the major environmental issues throughout the world. The spatial variability of salt accumulation through the soil profile was studied at Kalapara Upazila, Patuakhali district, Bangladesh. The soil samples... more
Salinity intrusion is one of the major environmental issues throughout the world. The spatial variability of salt accumulation through the soil profile was studied at Kalapara Upazila, Patuakhali district, Bangladesh. The soil samples were collected from 30 locations covering six villages: Solimpur, Umidpur, Diaramkhola, Hazipur, Monoharpur and Puranmohipur of Kalapara Upazila, Patuakhali district. From each spot, soil samples were collected from two soil depths (0-5cm and 5-10 cm).The study was therefore consisted (30 locations and 2 soil depths) 60 soil samples. The soils were strongly acidic having mean pH value of 4.11, and 4.83 in 0-5, and 5-10 cm soil depth, respectively. In 0-5 cm soil depth, the EC1:5 values were 5.80 dS/m. The EC1:5 values were drastically reduced to 1.86dS/m in 5-10 cm soil depth. The available P content in 0-5 and 5-10 cm soil depth was 21.3 and 24.1 ppm indicating the less availability of P in the surface soil. Available sulphur content found in 0-5 cm s...
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Two pot and two field experiments were conducted at Patuakhali Science and Technology University research farm to investigate the contribution of tidal submergence to phosphorus nutrition and yield of rice. Pot and field experiments were... more
Two pot and two field experiments were conducted at Patuakhali Science and Technology University research farm to investigate the contribution of tidal submergence to phosphorus nutrition and yield of rice. Pot and field experiments were conducted in the Aus and Aman seasons of 2009, respectively. The factorial experiments include two levels of water source-i) tidal water and ii) ground water, and three levels of fertilizers-i) absolute control (no fertilizer), ii) NK (P omission) and iii) NPK (P addition). The rice varieties used were BRRI dhan27 (HYV) and Local Mala (Traditional variety) in Aus season and BR23 (HYV) and Lalmota (Traditional variety) in Aman season. A general increase in growth, yield and yield contributing parameters were found due to irrigation with tidal water. Tidal water contributed about 21 (BR23) and 7 (Lalmota) % higher grain yield in Aman season 2009 and about 2 g biomass yield per pot (both BRRI dhan27 and Local Mala) in Aus season of 2009 compared to gro...
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Salinity is a serious threat to the crop production in the southern region of Bangladesh and it is especially important during dry period of a year. A study was undertaken to examine the changes in water and soil salinity over the period... more
Salinity is a serious threat to the crop production in the southern region of Bangladesh and it is especially important during dry period of a year. A study was undertaken to examine the changes in water and soil salinity over the period from February to April, 2014 at Kalapara upazila of Patuakhali district. Water samples were periodically collected from lake, pond, earthen well, deep tube-wells (5, 15 and 30 km away from the sea) and rivers (Tulatoli, Khaprabhanga, Sonatala and Andharmanik). Soil sampling was done from different crop fields (mustard, sweet gourd, potato, chilli, Khira-cucumber) and water melon and also from Sonatala and Andharmanik River flooded soils inside and outside polders. The electrical conductivity (EC) value of lake and pond waters was below 4 dS/m showing quite safe for irrigation while the EC value of earthen well exceeded 4 dS/m which are suitable in April. Water salinity of deep tube-wells (DTWs) increased as the DTW was closer to the sea, however all...
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The spatial variability of salt accumulation through the soil profile was studied at Latachapali union of Kalapara upazila, Patuakhali district, Bangladesh. The soil samples were collected from 30 locations covering six villages of the... more
The spatial variability of salt accumulation through the soil profile was studied at Latachapali union of Kalapara upazila, Patuakhali district, Bangladesh. The soil samples were collected from 30 locations covering six villages of the union: Kuakata, Malapara, Fashipara, Khajura, Mothaopara and Tajepara. Five locations were randomly selected from each village. From each location soil samples were collected from three soil depths at 0-2 cm, 2.1-4 cm and 4.1-6 cm. Electrical conductivity of top 0-2 cm soil depth was 20.49 dS/m, in 2.1-4 cm soil depth was 7.14 dS/m and in 4.1-6 cm soil depth 4.15 dS/m. The study soils were strongly acidic having pH value 4.73, 4.99 and 5.20 in 0-2, 2.1-4 and 4.1-6 cm soil depth, respectively. The highest of 8.8 Na:K ratio was found in 0-2 cm soil depth. The Na:K ratio gradually decreased with the increase of soil depth, having 6.59 in 2.1-4 cm and 5.42. in 4.1-6 cm soil depth. The results clearly reveal that the top soil is very much sensitive to salt...
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The effect of different rates of boron application on wheat cv. Bijoy was studied through a field experiment at Bangladesh Agricultural University (BAU) farm, Mymensingh during 2009-10 rabi season. The BAU farm belongs to Old... more
The effect of different rates of boron application on wheat cv. Bijoy was studied through a field experiment at Bangladesh Agricultural University (BAU) farm, Mymensingh during 2009-10 rabi season. The BAU farm belongs to Old Brahmaputra Floodplain agroecological zone (AEZ 9). Texturally the soil was silt loam, with 7.2 pH, 0.81% organic matter and 0.15 mg kg-1 available boron content. The experiment was laid out in a randomized complete block design with five boron rates and four replications. Boron rates were 0, 0.75, 1.5, 2.25 and 3.0 kg ha-1, with boric acid as a source. Every plot received blanket doses of 115 kg N, 25 kg P, 75 kg K and 15 kg S ha-1 from urea, TSP, MoP and gypsum, respectively. Treatment receiving B @ 2.25 kg ha-1 produced the highest grain yield (4.22 t ha-1) which was statistically identical with that obtained with 1.75 kg B ha-1. However, the crop response curve showed 1.90 kg ha-1 to be the optimum boron rate for the maximization of whe...
The experiment was conducted to see the phosphorus (P) mineralization pattern of bioslurry under aerobic and anaerobic soil conditions. Two bioslurry (cowdung bioslurry and poultry manure bioslurry) and their original manure (cowdung and... more
The experiment was conducted to see the phosphorus (P) mineralization pattern of bioslurry under aerobic and anaerobic soil conditions. Two bioslurry (cowdung bioslurry and poultry manure bioslurry) and their original manure (cowdung and poultry manure) at 3, 5, 10 and 20 t ha-1, respectively were thoroughly mixed with soil and incubated in aerobic and anaerobic moisture condition for 12 weeks. Among the four different types of manure, P release from poultry manure slurry was the highest. Poultry manure and cowdung slurry recorded very closer amount of available P. Both cowdung slurry and poultry manure slurry released higher amount of P compared to their original state (cowdung and poultry manure). P mineralization reaches in peak within 4-6 weeks of incubation. Under anaerobic condition the P mineralization was found higher compared to aerobic condition. The P mineralization data fitted strongly to the first order kinetic model. The bioslurries had lower rate of mineralization but had higher potentiality to release P in the soil compared to their original state.