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Articles by M. Abdul Karim
Total Records ( 6 ) for M. Abdul Karim
  Md. Shahidul Haque , Md. Rezaul Islam , M. Abdul Karim and Md. Abdul Halim Khan
  The experiment was carried out to study the effect of natural and synthetic mulches on yield of local and exotic garlic cultivars during the period from November, 2000 to march, 2001. The results of the experiment revealed that significant variations exist among the different mulches in respect of morphological characters, yield contributing characters and yield of garlic. Water hyacinth mulch produced the tallest plant with higher number of leaves and roots per plant, higher fresh and dry weight of bulb, length of bulb and highest yield per hectare. Bulb diameter and number of cloves per bulb were higher in black polyethylene mulch. The exotic cultivar performed better than the local cultivar in respect of plant height, number of leaves and roots per plant, fresh and dry weight of bulb and yield per hectare.
  Md. Shahidul Haque , Md. Rezaul Islam , M. Abdul Karim and M.A. Halim Khan
  A field experiment was conducted to study the effect of natural and synthetic mulches on biomass distribution in various parts and growth rates at different phenophases of local and exotic garlic (Allium sativum L.) cultivars. Significant variations exist among the different mulches in respect of dry matter partitioning and physiological characters of garlic. The results showed that Biomass production of leaf, root and pseudostem increased up to 105 days after planting (DAP) and thereafter decreased gradually at the approach of maturity. Total dry matter (TDM) also had a similar trend. Leaf area index (LAI) increased up to 90 DAP and then decreased gradually. CGR increased gradually with the advancement of crop growth. However, RGR from its highest value at early growth stage continued to decrease with crop age. The results indicated that among the natural mulches, water hyacinth mulch produced the plants with higher LAI, TDM and CGR but lower RGR. Transparent polyethylene mulch had a negative effect on growth of garlic. However, it had relatively higher RGR except 75 DAP and the non-irrigated control had the highest RGR. The exotic cultivar had higher biomass production, LAI, TDM and CGR but lower RGR in comparison to the local one.
  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.
  Pulak Kumar Sarkar , Md. Shahidul Haque and M. Abdul Karim
  Effect of plant growth regulators on yield of soybean was investigated. Plants of soybean cv BS-3 were sprayed at three different times with two concentrations (100 and 200 ppm) of gibberellic acid (GA3) and indole acetic acid (IAA). GA3 at 100 ppm had regulatory effect to enhance the plant height, number of branches, number of leaves, leaf area per plant, number of flowers, number of pods, percentage of fruit set, number of seed per plant, seed yield per plant, 100-seeds weight and seed yield (t ha-1). On the other hand, 100 ppm IAA produced the highest plant height, number of flowers, number of pods, percentage of fruit set, number of seed per plant, seed yield per plant and seed yield (t ha-1), as compared to other plant growth regulators and control. IAA at 200 ppm increased number of branches, number of leaves, leaf area per plant, 100-seeds weight and net assimilation rate.
  Pulak Kumar Sarkar , Md. Shahidul Haque and M. Abdul Karim
  The experiment was carried to investigate the effect of plant growth regulators on the growth of soybean. Soybean (cv. BS-3) plants were sprayed with 0, 100 or 200 ppm of GA3 and IAA at three different times (20 and/or 42 days after sowing). The results indicate that physiological characters e.g. leaf area index (LAI), crop growth rate (CGR), relative growth rate (RGR) and net assimilation rate (NAR) were influenced by the application of the growth regulators. GA3 and IAA at 100 ppm significantly increased LAI, CGR, RGR and NAR. IAA at 200 ppm increased NAR. Double spraying at 20 and 42 DAS performed better than single spraying at 20 DAS and spraying at 42 DAS. Double spraying with GA3 and IAA had the highest CGR, NAR, LAI. On the other hand, single spraying with GA3 produced highest RGR and 200 ppm of IAA produced highest NAR. Spraying at 42 DAS of GA3 and IAA produced highest leaf area index and CGR over the single and double spraying. LAI, RGR, CGR and NAR progressed in similar patterns, regardless of the treatments. The treated plants attained high LAI, RGR, CGR and NAR than the control. This study clearly shows that 100 ppm of GA3 and IAA treated plants performed better than control and other treated plants.
  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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