بررسي تاثير حذف برگ در مرحله شروع گرده افشاني طبق بر روي عملكرد روغن و اجزاي آن در دو رقم آفتابگردان

The Effects of Defoliation During the Beginning of Anthesis Stage on Oil Yield and Other Components of Sunflower

Effects of defoliation during the beginning of anthesis stage on oil yield and other components of sunflower was studied at Karaj Research Station , Faculty of Agriculture , University of Tabriz, in 2000 . Two varieties including Azargol (CMS19xR46) and Golshid (CMS31xR46) were used in this study. Leaves were removed at the beginning of anthesis(R5)and the treatments consisted of five levels: removal of 1/3upper leaves, 1/3middle leaves, 1/3lower leaves, total leaves and the control(no leaf removal).The trial was conducted as factorial experiment based on a randomized complete block design with three replications .Results of this experiment showed that time of maturity, duration of grain filling , ratio of kernel to whole grain and oil percent were affected by total defoliation but defoliation of - leaves did not affect these traits . Hollow achene percent,grain yield and oil yield were decreased by removal of total and - of leaves .Defoliation of - of lower leaves had less effect on these three traits as compared with other leaves. Middle leaves showed more effect than other leaves on grain yield and oil yield in this research.