PJB-2020-120
Effect of Sowing Dates on Grain Yield and Yield Components of Bread Wheat Varieties
Javed Iqbal
Abstract
Climate change has affected optimum sowing time of wheat and yield formation by fluctuation in temperature regimes during sowing season of crop. However, different varieties could differ in their potential for yield formation in response to sowing time. This 3-years study was conducted to ascertain the effect of sowing dates on yield formation and grain yield of wheat. Wheat varieties (Lasani-08, Faislabad-08, Millat-11, AARI-11 and Punjab-11) were sown on four different sowing times (November 01, November 15, November 30 and December 15). Yield and related traits of all varieties were decreased by delayed sowing. Early sown crop (November 01) had maximum emergence which decreased gradually with delayed sowing. Number of tillers m-2, grains per spike, grain weight and yield of all varieties was greater on November 15 sowing and decreased by sowing afterwards (November 30 - December 15). Although Lasani-08 and Punjab-11 both were high yielders but grain yield of AARI-11 was least affected by sowing time. Linear regression revealed that sowing time had negative relationship with emergence and grain weight of wheat varieties indicating them the most affected traits in response to temporal variation in sowing. Sowing time had negative relation with number of tillers for only Lasani-08 and Punjab-11, while non-significant relation with grains per spike. Nonetheless, number of tillers and grains per spike were correlated positively with grain yield indicating them the most crucial yield imparting traits. In conclusion, sowing of wheat on November 15 gave highest yield; and sowing time affected yield formation of different wheat varieties differently.
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