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Articles by M.A.H. Chowdhury
Total Records ( 3 ) for M.A.H. Chowdhury
  S.B. Bhyan , M.A.H. Chowdhury , M.M. Alam and M.S. Ali
  The experimentation was made to investigate the incidence of tomato yellow leaf curl virus and its effect on the nutritional components in fruits and chlorophyll content in the leaves of Lycopersicon esculentum taken under phytopesticidal management. Phytopesticidal treatments used in the study were extracts of neem (Azadiracta indica) fruits, garlic (Allium sativum) bulbs, karamja (Pongamia pinnata) leaves and mehogoni (Swietenia macrophylla) seeds. Plots with no phytopesticidal treatments were used as control. Plants under no management were found to be in highest incidence of the virus. There were significant role of phytopesticides in reducing the incidence and severity of tomato yellow leaf curl virus. Among the treatments, Karamja extract performed best against TYLCV in all respect of yield and yield related parameters of tomato. Viral infection in tomato plants caused a negative effect on fruit nutrition. Though negative effect of TYLCV infection was found for chlorophyll A content in tomato leaves, but for chlorophyll B, it caused no significant effect.
  R. Begum , M.A.H. Chowdhury , H.M. Zakir and M.R. Kabir
  Glucose and cellulose decomposition and subsequent transformation of sulphur (S) and phosphorus (P) in were examined. S was applied @ 0 and 20 μg as MgSO4.7H2O together with either 3000 μg glucose-C or 3333 μg cellulose-C, 250 μg N, 200 μg P and 250 μg kg -1 soil. Microbial respiration (CO2 evolution), inorganic SO4-S and available P were monitored over 30 days during incubation at room temperature at different intervals of time. Both glucose and cellulose decomposition rates responded positively to the S application. Respiration rate in glucose amended soil was approximately 3 times higher than cellulose. In glucose amended soil, 71 % and in cellulose amended soil, 51 % of the added C was decomposed at the end of the incubation period. Concentration of SO4-S varied significantly during incubation. Mineralization followed by immobilization was observed and maximum net immobilization was 14 and 8 μg S g -1 soil for cellulose plus S20 and glucose plus S2O treatments, respectively. During incubation glucose and cellulose amendment caused immobilization of P.
  S.K. Sarker , M.A.H. Chowdhury and H.M. Zakir
  Effect of S and B fertilization on yield, quality and nutrient uptake by soybean was investigated. Experiment comprised five levels of both sulphur and boron viz. 0, 10, 20, 30 and 50 kg S ha-1 and 0, 0.5, 1.0, 2.0 and 4.0 kg B ha-1. Yield and yield attributes were significant when S and B were applied individually but their interaction were not significant. The highest biological yield and most of the yield attributes were obtained for the treatment combination of 30 kg S and 1.0 kg B ha-1. Grain yield was found to be significantly and positively correlated with effective pod and seed per plant. Grain yield was directly proportional to harvest index. Grain S and B uptake was significant by both S and B application individually but their content was not significant. Protein and oil contents of soybean grain were increased with increasing levels of both S and B though their effects were not significant. A positive and significant correlation was observed between protein and oil contents of Bangladesh soybean-4. The overall results suggested that S and B @ 30 and 1.0 kg ha-1 alone or in combination proved to be the best in respect of the parameters studied.
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