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Articles by M. A. I. Khan
Total Records ( 3 ) for M. A. I. Khan
  M. A. I. Khan , K. Ueno , S. Horimoto , F. Komai , K. Tanaka and Y. Ono
  This study evaluated the upland weed control potentiality, germination inhibition ability and growth suppression efficiency of the five combinations of green tea waste – rice bran compost (GRC). GRC was prepared by mixing green tea waste and rice bran at five ratios, and allowed to decompose for 5 mo. Application of GRC suppressed weed growth up to 93.4% in number and 95.4% in dry weight in 2004, and 80.7% in number and 73.4% in dry weight of weeds in 2005, as compared with the untreated control (only soil) under the greenhouse condition. Among the five combinations of GRC, rice bran alone (RC) showed the significantly highest and green tea waste alone (GC) showed the lowest weed suppressing activity in both years. The weed control potentiality of GRC was increased by the increase of rice bran percentages in the mixture. The exudates of GRC inhibited the hypocotyl and radicle elongation of lettuce seedlings when examined by the sandwich method. The water extracts of GRC also inhibited the germination and radicle elongation of the test species in the seed germination tests. The growth inhibitory activity of RC was greater than that of GC, and radicle elongation was more sensitive than seed germination and hypocotyl elongation in all bioassays. The inhibitory activity of GRC water extract varied with the test species and was higher for the dicotyledonous species than monocotyledonous species. The inhibitory effect on seed germination and seedling growth increased as the extract concentration increased. The concentration dependent responses of test species to the water extract of GRC indicated that it might contain phytotoxic substances that were responsible for growth inhibition. Moreover, GRC promoted spinach growth significantly compared with the untreated control. These results suggest that the use of 30% green tea waste + 70% rice bran mixture compost (GRC-3) might be useful to control the upland weeds and enhance spinach growth among the five combinations of GRC, and it may reduce the use of hazardous synthetic agrochemicals. Optimization of the combination of composting materials is necessary for the multipurpose use compost.
  M. A. I. Khan , K. Ueno , S. Horimoto , F. Komai , K. Tanaka and Y. Ono
  Rice bran compost (RC) was evaluated under greenhouse and field conditions for eco-friendly weed control of vegetable crops in organic farming systems. RC was applied 7 days before spinach seed sowing, at the rate of 0% (control), 10%, 20% and 30% of soil (v/v) in the greenhouse and 2 kg m-2 under field conditions. RC significantly controlled the number and dry weight of weeds, and the weed control potentiality was increased by the increased application of RC in both years. The efficacy of RC in reducing weed emergence and dry weight of broadleaf species was higher than grass weeds. Among the broad leaf weeds, Lamium amplexicaule L was the most sensitive to RC and was drastically reduced by the increased application of RC. Under field conditions, the total number of weeds and the dry weight of weeds were also significantly reduced with the application of RC, compared with the untreated control. The growth inhibition potentiality of water soluble fractions of RC was also tested with seed germination and radicle elongation of test species (barley, oat, tomato and lettuce). The concentration response curves for the test species were drawn by plotting the percentage of germination against the logarithm of the concentration. Considering the I25 value (defined as 25% inhibition of control) both for seed germination and radicle elongation, it was indicated that water soluble fractions of RC was more effective in the suppression of dicotyledonous species (tomato and lettuce) than monocotyledonous species (barley and oat). The results of the preliminary experiment with fresh rice bran under greenhouse conditions showed that fresh bran suppressed spinach seed germination when applied as 10% rice bran in soil but RC did not show a significantly negative effect up to 20% RC application, compared with the control. Moreover, RC enhanced spinach growth. Considering both the weed control potentiality and spinach growth enhancing ability of RC, the effective appplication rate of RC is between 10-20% of soil (v/v) for weed control as well as the successful growth of spinach. This research indicates that RC has the potential of being used as a natural herbicides.
  A. K. M. Saleh , M. A. Latif , M. A. I. Khan , H. Rahman and M.K. Uddin
  Seven fungal genera namely Alternaria, Fusarium, Aspergillus, Penicillium, Rhizopus, Chaetomium and Curvularia, were found to be associated with seeds of 4 districts (Narsingdi, Munshiganj, Manikganj and Mymensingh) of Dhaka Division. Percent incidence of different fungi varied with locations and duration of storage period. The highest seed-borne infection of Alternaria was detected at Narshigdi (10.32%), followed by Munshiganj (10.06%), Manikganj (8.66%) and Mymensingh (6.03%). The frequency of Alternaria decreased with the increasing of storage period but Fusarium and Aspergillus increased with the increasing of storage period. Germination of mustard seeds ranged from 57.29 to 77.75% in respect of locations and duration of storage period. Percent germination decreased with increasing of the duration of storage period. Five selected fungicides were tested against Alternaria. Among the fungicides Rovral was found to be the best followed by Panoctine, Lirotect, Topsin M and Cupravit. All the fungicides at the @ 0.25 and 0.50% seed weight increased germination significantly from 5 to 13% over control treatment. But only Rovral increased germination from 11 to 13% at both concentrations.
 
 
 
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