Variation in morpho-physiological characters of spring wheat (Triticum aestivum L) evaluated under normal and late planting
1992
Bhatta, M.R.
Marked variations were observed among genotypes with respect to various plant attributes in each planting date. Plant characters not influenced by planting dates were length of awns, number of spikelets per spike, number of kernels per spikelet, 100 kernel weight, and grain yield. Average heading and flowering duration were shortened by three days, maturity by six days, grain filling duration by four days, and green area duration by three days under late planting. However, absolute differences among genotypes with respect to these traits became rather small and delayed sowing. On the other hand, there was an overall increase in harvest index by eight percent under late planting. This increase in harvest index could be associated with the decrease in biological yield. On the basis of overall grain yield and other plant characters, genotypes C1690-1, C676-4, Acc43686, and C278-9 and Trigo-2 appeared to have better yield advantage in both plantings. Correlation analysis involving sixteen morpho-physiological characters indicated that eight traits namely, length of flag leaf sheath, extrusion length, green area duration, plant height, spike length, kernels per spikelet, kernel per spike, and biological yield were significantly and positively correlated with grain yield in both normal and late plantings. Additionally, kernel weight per spike and 100 kernel weight in the normal planting, and length of flag leaf, flag leaf area, flag leaf angle, awn length, and productive tillers in the late planting appeared to be closely associated with grain yield.
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