عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In order to study the effect of water deficit effects on agronomic characteristics of sunflower hybrids, three separate experiments were conducted as randomized complete block design with three replications at the research field of seed and Plant Improvement Institute - Karaj. The first experiment conducted at optimum conditions and plants were irrigated after 60 mm evaporation from evaporation pan at germination stage till end of growing period, whereas the second and third experiments were irrigated after 120, 180 mm evaporation from evaporation pan, class A, respectively, and were considered as water deficit conditions. The results showed significant effects of water deficit on 75 percent flowering stage, 1000 seed weight, seed number per plant, seed yield, productivity effort, harvest index and seed oil content. Sever water deficit caused the decrease of seed yield to 500 Kg ha-1 (83 percent reduction) which was due to decrease of 1000 seed weight (50 percent) and seed number per plant (54 percent). Also, Allstar produced the highest yield in medium and severe water deficit and the Mehr was superior to other hybrids in normal condition.