بررسی صفات تعیین کننده عملکرد دانه گندم دوروم ((Triticum turgidum var durum تحت شرایط تاریخ کاشت متفاوت و تنش رطوبتی در مراحل نموی با استفاده از روش های آماری چند متغیره

To investigate the determinant traits of of durum wheat grain yield under different sowing dates and water stress in the developmental stages an experiment was performed in research field Agriculture and Natural Resources University of Ramin, Ahwaz, in the form a split - plot based on randomized complete block design with 5 replications at 91-1390year. Data analysis based on stepwise regression indicated a significant effect of grain per spike, number of spike/m2 and grain weight, grain in justified of yield. So that these three traits were explained about 0/965% of yield variance. Path analysis determined that grains per spike had the most significant positive direct impact on grain yield (0/554 **) and Spike traits (./398) and grain weight (. / 258), respectively, are given less importance in explaining the yield. Factor analysis showed that 6 factor was justified about 6 91/603% of all data changes. That climate for higher grain yield in Khuzestan province maintain of the number of grains per spike, number of spike and grain weight and also plant height and harvest index along side these traits was more important.