تعيين صفات مؤثر در افزايش عملكرد ارقام گندم نان پخت تحت شرايط متفاوت رطوبتي با استفاده از تجزيه هاي آماري چند متغيره

The Effects of Some Agronomic Traits on Grain Yield of Wheat under Irrigated and Non-irrigated Conditions by Using Multivariate Statistical Analysis

In order to determine the effects of some agronomic traits on yield of wheat under irrigated and non-irrigated conditions, an experiment was conducted at Mehran and Sarableh Research Stations of Ilam province, in Iran during 2004-05 crop seasons. In this study 12 bread wheat cultivars were planted under irrigated and non-irrigated (drought stress) conditions in a randomized complete block design with three replications. The results indicated that plant height, 1000 kernel weight, seed yield and harvest index were decreased under drought condition. Under non-irrigated conditions the number of spike per m2 and 1000 kernel weight, had a high positive correlation with grain yield. In irrigated condition high positive correlation were observed between the seed yield with the number of spike per m2 and harvest index. Results of stepwise regression analysis indicated that the biological yield and harvest index had the most influence on yield. Their influence accounted for nearly 99.3% and 97.7% of yield variation under irrigated and non-irrigated conditions, respectively. These results in path analysis were confirmed. Principle components analysis under irrigated conditions showed that the five principle components included 78% of total variances, whereas under non-irrigated condition (drought stress) five principle components included 87% of total variances. By using a desirable compound of characteristics these results can be used in breeding programs. According to these results it can be concluded that Mohammadi, Gahar, Koohdasht and Ghanari varieties had the highest and the most stable seed yields.