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Articles by Md. Shahidur Rahman
Total Records ( 3 ) for Md. Shahidur Rahman
  Md. Shahidur Rahman , Nashirul Islam Md , Abu Tahar and M. Abdul Karim
  The experiment was conducted to study the effect of plant growth regulators and their time of spray on morphology, yield and yield contributing characters of soybean. Plants of soybean Cv. PB-1 were sprayed three times (T1 = spray at 15 DAS, T2 = spray at 30 DAS and T3 = spray at 45 DAS) with two concentrations (100 and 200 ppm) of gibberellic acid (GA3) and maleic hydrazide (MH). Significant variations exist among the concentrations of growth regulators and with their time of application in respect of morphological, yield and yield contributing characters of soybean. T2 followed by T3 produced the tallest plant with the highest number of branches, leaves, flowers, pods per plant, number of seeds per pod, seed yield per plant, 100-seed weight and seed yield (t ha-1). T1 produced the least of them. GA3 was more effective than MH. GA3 at 100 ppm followed by GA3 at 200 ppm produced the highest number of branches, leaves, flowers, pods per plant, number of seeds per pod, seed yield per plant, 100-seed weight and seed yield (t ha-1) while 200 ppm MH was least effective to produce them. The present study clearly shows that almost all the plants treated with growth regulators performed better than control. However, interaction effect indicated that 100 ppm GA3 treated plants sprayed at 30 DAS (T2C3) showed the best performance.
  Md. Shahidur Rahman , Md. Asraful Haque and Md. Abdus Salam
  The experiment was carried out at the field laboratory of Bangladesh Institute of Nuclear Agriculture, Mymensingh, during amon season (July to October, 2001) to study the effects of different tillage practices on growth, yield and yield contributing characters of BRRI Dhan-33. The crop was grown under supplemented irrigation condition. The soil was calcarious grey belonging to Sonatola series of old Brahmaputra flood plain. The treatment of this study comprised of power tiller with 1, 2, 3 and 4 passes at 7 and 15 cm depth and 4 passes with country plough at normal depth. The 4 passes at 15 cm deep ploughing by power tiller showed the highest yield of grain (4.95 t ha-1) and straw (5.89 t ha-1) which was associated with higher leaf area index (LAI), crop growth rate (CGR), net assimilation rate (NAR), total dry matter (TDM), leaf numbers/hill, plant height, number of total and effective tillers, panicle length, number of filled grains/spikelets/panicle and with lower number of non-bearing tillers/hill and sterile spikelets/panicle. The lowest values of all parameters were found in 1 pass with power tiller at both 7.5 and 15 cm depth. Though 4 passes with country plough at normal depth and 3 passes with power tiller at 15 cm depth showed statistically identical results of 4 passes with power tiller at 15 cm depth in respect of yield performance, this treatment (4 passes with power tiller at 15 cm depth) gave the highest yield practically.
  Md. Shahidur Rahman , Nashirul Islam Md. Abu Tahar and M. Abdul Karim
  A study was conducted to investigate the effect of plant growth regulators on dry matter production and growth attributes of soybean. Plants of soybean Cv. PB-1 were sprayed three times (T1 = spray at 15 DAS, T2 = spray at 30 DAS and T3 = spray at 45 DAS) with two concentrations (100 and 200 ppm) of Gibberellic Acid (GA3) and Maleic Hydrazide (MH). The results of the experiment revealed that significant variations exist with the time of application in respect of dry matter production in root, stem, leaf and total dry matter per plant and growth attributes like Leaf Area Index (LAI), Crop Growth Rate (CGR), Relative Growth Rate (RGR) and Net Assimilation Rate (NAR). CGR and NAR were increased up to 80 DAS and thereafter decreased due to maturity with respect of time of spray and concentration of growth regulators. However, LAI and RGR were maximized at 100 and 60 DAS, respectively. T2 produced the highest root, stem, leaf and total dry matter, LAI, CGR, RGR and NAR followed by T3 and T1 produced the least of them. All growth regulators had positive effect in dry matter production and growth of soybean over non-sprayed control plants. GA3 was more effective than MH. However, 100 ppm GA3 had the most regulatory effect to enhance root, stem, leaf and total dry matter, LAI, CGR, RGR and NAR followed by 200 ppm GA3. 200 ppm MH was least effective among the treatments. Interaction between T2C3 (spray at 30 DAS x 100 ppm GA3) brought about the best improvement in dry matter production and growth of soybean.
 
 
 
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