Grain Yield and Critical Yield Determining Component of Bread Wheat Varieties in Response to Sowing Dates
Grain Yield and Critical Yield Determining Component of Bread Wheat Varieties in Response to Sowing Dates
Javed Iqbal1, Ali Zohaib1*, Muzzammil Hussain1, Iftikhar Ahmad1, Adnan Bashir1, Wardah Muzaffer2, Naeem Faisal1, Muhammad Tahir Latif1 and Sami Ullah1
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 impact of sowing dates on grain yield and critical yield component of different wheat varieties. Wheat varieties (Lasani-08, Faislabad-08, Millat-11, AARI-11 and Punjab-11) were sown on different sowing dates (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. Tillers m-2, grain weight, grains per spike 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 manifested negative relations 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, tillers m-2 and grains per spike were correlated positively with wheat yield indicating them most crucial yield imparting traits. In conclusion, wheat sowing on November 15 produced maximum yield; and number of tillers was critical yield determining component followed by grains number per spike in response to sowing dates.
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