Effect of planting dates on the yield of three cultivars of bread wheat ( Triticum aestivum L.)

In order to evaluate the performance of 3 promising cultivars under the identified optimal planting dates, a field experiment was carried out in the winter season of 2020-2021 in the fields of the Agricultural Research Department at Abu Ghraib. The purpose of the experiment was to examine the effects of 6 planting dates (25/10/20, 10/11/20, 25/11/20, 11/12/20, 25/12/20, 10/1/21) on the yield and its components of 3 approved wheat cultivars (Bohooth 10, Bohooth 22 and Bohooth 158). A Split Plot Design with 3 replications was used. Planting date D3 (25/11/20) outperformed the other dates in most of the studied traits, with the highest weight of 1000 grains (39.14 g) and the highest grain yield (6.42 t ha-1 ). While, cultivar Bohooth 22 outperformed the other cultivars in most of the studied traits, with the highest mean plant height (89.61 cm), number of spikes per m2 2 (281.9), weight of 1000 grains (33.73 g) and grain yield (5.02 t ha-1 ). There were no significant differences between cultivars in the number of grains per spike trait. Cultivar Bohooth 22 at planting date 25/11/20 outperformed the other combinations between cultivars and planting dates, with a grain yield of 8.03 t ha-1 .