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Articles by D. Wright
Total Records ( 6 ) for D. Wright
  A. B. Siddique , D. Wright and S. M. Mahbub Ali
  This experiment was conducted to test a range of sowing dates, between 01.03.99 and 07.06.99 and in this way covering a wide range of environmental situations. Seed yield, yield component and different development periods of peas were measured. It was found that seed yield generally decreased in delayed sowing. Decrease of yield in delayed sowing was due to decreases in all yield components. The effects were significant for number of seeds per m2, number of seeds per plant and number of seeds per pod but not for number of pods per m2 and per plant.
  A. B. Siddique , D. Wright , S. M. M. Ali and A. F. Mollah
  This experiment was conducted to test a range of sowing dates, between 01.03.99 and 07.06.99 and in this way covering a wide range of environmental situations. Seed yield, yield component and different development periods of flax were measured and compared. It was found that seed yield generally decreased by delayed sowing. The effects were significant for number of seeds per m2, number of capsules per plant, number of seeds per plant and number of seeds per capsule but not for number of capsules per m2
  A.B. Siddique , D. Wright and S.M. Mahbub Ali
  An experiment was conducted to identify the effect of time of sowing on the quality of pea seeds. Eight sowing dates from 01.03.99 to 07.06.99 with an interval of fifteen days were tested for covering a wide range of environmental variations. Seed quality was determined by using germination percentage, emergence percentage, controlled determination test (ageing test) and electrical conductivity test. Starch, protein, water soluble carbohydrate and fat percentages of seeds from four selected sowings were also determined. Germination percentage of unaged seeds obtained from sowing 1 to 5 i.e., from 1-3-99 to 26-4-99 was high and similar and then decreased. This decrease was only significantly lower of seeds obtained from last sowing date (07.06.99). Vigour of aged seeds was markedly lower in 1, it then increased and was relatively constant between 2 and 5 (15.03.99 and 26.4.99) and after that it decreased to 8%. In all treatments emergence percentage of unaged seeds was over 70%, but in aged seeds, emergence percentage was decreased markedly after 5.
  A.B. Siddique , D. Wright and S.M. Mahbub Ali
  An experiment was conducted to identify the effects of time of sowing on the quality of flax seed. Eight sowing dates from 01.03.99 to 07.06.99 with an internal of fifteen days were tested for covering a wide range of environmental variations. Seed quality was determined by using germination percentage, emergence percentage and controlled determination test (ageing test). Starch, protein, water soluble carbohydrate and fat percentages of seeds from four selected sowings were also determined. Germination percentage of unaged seeds ranged from 94 to 99%. Germination percentage was slightly lower at the last sowing date but the effect was not significant. Raising seed moisture content followed by ageing at 50oC for 36 h decreased germination percentage markedly. In aged seeds germination increased from S1 to S4 and then decreased as sowing was delayed after that. Emergence percentage of unaged seeds ranged from 73 to 95%. Raising seed moisture content followed by ageing at 50oC for 36 h decreased emergence percentage. Sowings from 01-03-99 to 12-04-99 were given o vigorous seeds but sowing made on 12-04-99 had the highest vigour.
  M. Ahsan and D. Wright
  Effects of leaf age on ion uptake (Na+, K+ and CI‾) and K+/Na+ ratio were investigated using the three S1 wheat selections Alex-1, KRL-24 and Khar-1. Na+ and CI‾ contents were found to be increasing in the older leaves, but K+ content and K+/Na+ ratio were found to be decreasing in the younger leaves. However, it is suggested from the results that sampling should be done when leaves are fully expanded. Khar-1 was found to be intermediate between Alex-1 and KRL-24 in ion uptake and K+/Na+ ratio at three out of the four sampling dates. The considerable variation in Na+, K+, Cl‾ uptake and K+/Na+ ratio between sampling dates suggests that these traits might be less useful as selection criteria.
  A.B. Siddique , A. Khatun , M.M. Rahman and D. Wright
  Studies were provided evidence that as density of plant increased seed yield decreased and number of pods per plant, number of seeds per plant, number of seeds per pod, seed weight per plant and 100 seed weight all decreased. High density also produced the poorest quality pea seeds. There were no differences in germination percentage of the seeds produced from the main stem. However, the seeds produced from the branches showed a variation in germination. The germination percentage was similar in the lower nodes but in the upper nodes of the branches showed a lower germination percentage.
 
 
 
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