Simultaneous Selection for Yield and Yield Stability and its comparison with Different Stability Statistics of grain yield in Wheat cultrivars in Kurdestan Province

To select stable and high grain yield wheat varieties as well as to determine suitable sowing date for cold agro-climatic zone in Iran, eight wheat varieties were studied using randomized complete block design with four replications in six locations (Sanandaj, Gorveh, Marivan, Divandarreh, Saggez and Baneh) during three growing seasons (2007-2010). Since interaction of cultivar × year × location was significant, stability analysis was performed using different methods. Results of stability analysis with shukla’s stability variance method showed that the Zarrin and Sabalan varieties were more stable than other varieties. Also, lowest environmental variance was belonged to Azar 2. The results of ranking method showed that cultivars Sabalan, Bezostiya, Alvand, Alamout and Omid had the lowest i R and cultivars Alvand, Sabalan, Navid, Zarrin and Omid had also the lowest SDR among the experimental cultivars. Results of stability analysis with yield - stability statistic (YSi) method indicated that the varieties Alvand and Alamout were the most stable varieties, respectively. Results of this research showed that the Alvand and Sabalan varieties had the highest yield stability than the other varieties and can be recommended for studied locations.