Influence of delayed sowing in wheat (T. aestivum L.) genotypes: plant growth and yield attributes
2008
Chandra, Ruchi | Singh, Munna | Singh, Dheer | Saini, Sonia | Verma, A.P.
Wheat (Triticum aestivum L.) is a major cereal crop of north India, usually sown after rice harvesting under rice- wheat, and after harvesting of sugarcane ratoon in sugarcane based cropping systems in late Nov.-Dec., and even goes upto January. It grows well under low temperature (10-20°C) while anthesis occurs during the on-set of continuous warm temperature (25-30°C) coupled with hot and dry air (RH 45-50%) in late Jan. and Feb. The genotypes viz., PBW-396, Raj-3765, UP-2382, UP-1109, PBW- 373, C-306, VL-802 and VL- 738 were sown at two different dates abbreviated as D1 and D2 keeping 30 days time interval (25 Nov- 25t h Dec.). The leaf area was recorded with the view that it has got tremendous role for intercepting photosynthetic irradiance linked with light use efficiency to transform photochemical energy for carbon economy based on photosynthesis. The loss in leaf surface area was observed 10-16% in late sown cultivars. The optimal value of Chl content was found 4.6 mg/g fresh mass with Chl a/b ratio 3.8 in VL-802. Chl content and Chl a/b ratio were found decreased in delayed sown cultivars. The flag leaf senescence also occurred faster in delayed sown cultivars with reduction in total life span linked with down-regulation of plant performance and plant productivity.
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