Effect of sowing date on yield and its components for some bread wheat genotypes

الملخص EN

Two field experiments were conducted at the experimental farm of Sakha Agricultural Research Station ARC, Kafr El-Sheikh, Egypt, during two winter successive seasons 2016/17 and 2017/18 to determine the effect of two planting dates (23 November and 23 December) on yield and its components of 14 bread wheat genotypes.

The experimental design was randomize complete bloke with three replications.

Each sowing date is sown in separated experiment, the first experiment was planted on 23 Nov.

(recommended sowing date), while late one were on 23 Dec.

in both seasons, Results indicdated that, heading and, maturity dates, grain filling period and rate, plant height, grain weight, number of grains/spike, number of spikes/m², grain and straw yields and harvest index were significantly affected by sowing dates.

Recommended sowing date (23 Nov.

) recorded the highest value for each of character in both growing seasons.

Sids 4 and Line 10 were the earlier genotypes for days to heading and maturity.

Misr 2 and Line 8 were the best genotypes for grain filling rate, grain and straw yield in both seasons.

Whereas, Misr 2 recorded the highest value for each of plant height and No.

of spikes/m².

Line 7 recorded the highest value for each of grain weight and harvest index.

For tolerance index (TOL), the lowest values were recorded for Lines 9, 11 and 10, respectively.

With regard for yield reduction, the lowest values were obtained by Misr 2 and line 9.

Therefore, Misr2 and line 9 recommended to sowing in both recommended and late sowing date in North Delta region.