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Articles by D.K. Biswas
Total Records ( 2 ) for D.K. Biswas
  D.K. Biswas , M.M. Haque , A. Hamid , J.U. Ahmed and M.A. Rahman
  A field experiment was carried out to evaluate the growth and yield performance of two blackgram varieties i.e., BARImash 3 and BINAmash 1 under three different population densities. The planting configurations were 40 x 10 cm2, 30 x 10 cm2 and 40 x 5 cm2 representing 25, 33 and 50 plants m-2. Both the blackgram varieties showed identical results in LAI, CGR, NAR, RGR as well as grain yield. But planting density had significant effects on LAI and CGR of the blackgram varieties. The highest planting density showed the highest LAI and CGR but the highest grain yield was recorded from intermediate population density due to the highest number of pods per unit area. The NAR and RGR did not differ due to different population densities.
  D.K. Biswas , M.M. Haque , A. Hamid and J.U. Ahmed
  Pot experiment was conducted to asses the temporal effects on gas exchange characteristics of blackgram at different growth stages. Two blackgram varieties namely BARImash 3 and BINAmash 1 were sown at 10 days interval on August 26, September 6, September 16 and September 26 of 1999. At each sowing time, photosynthetic gas exchange characteristics were measured at vegetative, flowering, pod filling, early maturity, mid maturity and late maturity stages of blackgram. Varietal difference was minimal but sowing time had profound effects on gas exchange characteristics of blackgram. Photosynthetic rate was higher in blackgram leaf sown on August 26 with its higher stomatal conductance, lower intercellular CO2 concentration and higher mesophyll conductance. The highest respiration rate was recorded at pod filling stage and fluctuated widely over the sowing times. Photosynthetic rate of blackgram decreased with delay in sowing times and the lowest rate was observed on September 26 sowing. Gas exchange characteristics were the highest at flowering stage of blackgram and declined gradually with the advent of plant age.
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