الفهرس 
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Abstract
To get the best outcomes from the interaction between cultivars and environment conditions, we should choose the perfect sowing dates. The current study aimed to detect the most suitable sowing date that increases grain yield and improves the quality of seven wheat cultivars (Gemmiza 12, Sakha 94, Misr 1, Giza 171, Gemmiza 11, Misr 2, Sids 12). They were estimated under four sowings (1st November, 15th November, 1st December, 15th December) during two consecutive seasons 2017/18 and 2018/19. The experiment was conducted at Sakha Agricultural Research Center (ARC) at north region of Delta, Egypt. The second sowing 15th November recorded the best results for all the studied characteristics which gave the highest values of grain yield, one thousand grain weight, number of grain/spike, weight of the spike, stander germination, storability, relative density (R.D), hectoliter and crude protein content among all cultivars specially in the first season 2017/18. Misr 1 recorded the highest percentage of germination, storability and viability (by declaration E.C value). Misr 2 recorded the highest value of R.D and crude protein percentage. Meanwhile, Giza 171recorded the highest percentage of wet gluten. Gemmeiza11 superior the other cultivars for dry gluten percentage. On the other hand, Gemmeiza 11 recorded the lowest percentage of gluten hydration. Misr 2 recorded the highest value of R.D and crude protein percentage. Delayed sowing is related with generous misfortunes in grain yield assessed by 29.81% compared with early sowing date. Giza171 cultivar surpassed the other cultivars in grain yield and its components and the crude protein content however, Misr 1 outperformed the other six cultivars in other technological characteristics. The current investigation supports the utilization of early sowing dates for acquiring most extreme yield. Moreover, the wheat yield can be raised fundamentally by cultivar selection.