Evaluation of yield and yield components of different bread wheat cultivars under drought stress conditions in Sanandaj region

In order to investigate the effect of drought stress on yield and yield components of four bread wheat cultivars, an experiment was conducted in the form of split plots based on randomized complete blocks in three replications at Sanandaj Grizzah Agricultural Research Station. In this experiment, irrigation cessation as the main treatment at four levels, including cessation of irrigation in the spike stage, cessation of irrigation in the flowering stage, cessation of irrigation in the milking stage and normal irrigation, and bread wheat cultivars as a sub-treatment in four levels, including Sions were Gascogen, Zarrin and Alvand. The results of this study showed that irrigation cut-off treatment led to a significant reduction in traits such as spike length, 1000-seed weight and grain yield, but traits such as number of seeds per spike, number of spikelets per spike and number of seeds per spike were not significant. The results also showed that Alvand and Zarrin cultivars were the most resistant cultivars to different levels of stress, respectively. In addition, normal irrigation had the best results in increasing the yield and yield components of bread wheat cultivars.