Effect of Foliar Application with Gibberellic Acid on Growth, Yield Components of Sesame and its Seed Oil Content

Howaida E. Abdel Kader*

Agronomy Department ، Faculty of Agriculture ، Assiut University، Assiut ، Egypt. Correspondence Author: howidaahmed10@gmail.com

DOI: 10.21608/AJAS.2026.451090.1586

© Faculty of Agriculture, Assiut University

Assiut Journal of Agricultural Sciences 57 (2) 2025 (27-44)

Abstract

The present investigation was carried out at field Experimental Station, Agric. Faculty., Assiut Univ., during the two successive summer seasons, 2023 and 2024 to evaluate the effects of foliar application of gibberellic acid at three times; 25 or 45 days once and twice at 25 and 45 DAS during growing season with concentrations of 0, 50, 100, and 150 ppm GA₃ on the growth, yield, and seed oil characteristics of sesame (Giza 32).

Results showed that highly significant differences in mean vegetative growth, yield components and seed oil yield in both seasons. Application of 150 ppm of GA₃ significantly increased plant height by (18.23 & 18.18%) and fruiting zone length by (31.61 & 31.65%) as well as, No. of capsules plant ^-1 by (28.86 & 28.90 %), capsule length by (5.86 & 11.22 %) and No. of seeds capsule^-1 by (19.84 & 19.87 %) in comparison to the control treatment in both seasons, respectively.

Spraying GA3 twice at 25 and 45 DAS induced significant values of all vegetative and yield components and seed oil yield in both seasons.

The most effective treatment which gave the highest values of yield and its components in both studied seasons was that of spraying 150 ppm GA3 twice at 25 and 45 DAS which recorded (1036.1 & 1152.5kg fed) for Seed yield, (514.3 & 572.1kg fed) for Oil yield and (20.75 & 23.08) for HI in both seasons, respectively