Effect Of Gibberellic Acid And Water Stress In Growth, Yield Characteristics And Oil Percentage On Sunflower

Abstract

A field experiment was conducted during spring season 2021 at the Agricultural Research Station, College of Agriculture, University of Basrah (Al-Haritha site) at 25 km from the center of Basrah Government, to determine the effect of four concentration of Gibberellic acid (G0=0, G1=100, G2=200, G3=300 ppm) and three levels of water stress (S1=%100, S2= %75, S3=%50 from field capacity) on the growth, yield and oil quality of sunflower (Helianthus annuus L.), Aqmar cultivar. The experiment was carried out by a Split- Plot according to Randomized Complete Block Design (R.C.B.D.) with tow replicates. Water stress levels occupied the main- plot, and Gibberellic acid concentration occupied sub-plot. The results showed that (G1) was significantly superior in leaf area, disc diameter, plant yield, biology yield, harvest index and oil yield. The water stress (S1) was significantly superior in all studied traits. The interaction between Gibberellic acid and water stress showed the superiority, the combination (S1 G1) give the best mean in all studied traits comported with (S3 G0) which gave lowest of means.