بررسي اثر كم آبياري بر عملكرد 7 رقم سورگوم دانه اي با استفاده از شاخص هاي تحمل به تنش

The study of low irrigation effect on yield of seven grain sorghum cultivars with use of drought tolerance indices

In order to study of low irrigation on seven grain sorghum yield in sistan region one experiment carried out as split plot in bas e design of randomized complete block design with 3 replications. Cultivars inserted in sub plot and 2 levels irrigation (normal and low irrigation) inserted in main plot as in normal condition irrigation continued to harvest stage but in low irrigation condition in panicle appearance irrigation interrupted to harve st stage.Analysis of variance showed there are signi ficant difference among cultivars for grain yield in 1% level. Comparison means showed cultivars kirnia, KOS3 and KOS4 with 263 8.8 ,2665.6 and 2771.3 kg/ha had the most yield respectively. In order to study of drought stress indices, cultivars was studied by this indices. MP indic e showed the high positive and significant correlation in 1% level with grain yield in drought condition (0.939 ) and 5% level (0.793) in normal condition and was selected the best indice for selection of tolerance cultivars , and on base of amount this indice (658.95) KOS3 cultivar was known as tolerate cultivar,