اثر تاريخ كاشت بر عملكرد دانه ارقام گندم نان با تيپ هاي رشد متفاوت در منطقه سردسير اردبيل

Effect of Swoing Date on Grain Yield of Bread Wheat Cultivars with Different Growth Habits in Cold Region of Ardabil

For successful wheat production in cold regions, close attention must be paid to all factors that influence the ability of wheat plants to abtain maximum cold tolerance. The effect of different sowing dates of bread wheat (Triticum aestivum L.) cultivars with different growth habit on grain yield and winter survival was studied in cold regions of Ardabil. An experiment was conducted in a randomized complete block design in strip-plot arrangements with five sowing dates (7 Oct., 17 Oct., 27 Oct., 6 Nov., and 16 Nov.) and three wheat (Omid cross as spring and Azadi cross and Barakat as winter). The results showed that the highest grain yield and less winterkill were obtained from early seeding of winter types. A significant (P < 0.05) decrease in grain yield and high winterkill was occurred with delay in seeding of winter habit cultivars. Spring habit cultivar showed the highest winterkill and significantly (P < 0.05) loss of grain yield in the early sowing date. While, a significant reduction in winterkill and increase of grain yield was observed in the late seeding of spring habit cultivar compared to early sowing date. From these results it can be concluded that sowing date x cultivar interaction determines the optimal sowing date in cold regions. Also, planting of a winter habit wheat cultivar at optimal sowing date can increase wheat production in cold region of Ardabil.