EFFECT OF GIBBERELLIC ACID ON THE YIELD OF PARTENOCARPIC AND STENOSPERMOCARPIC GRAPE CULTIVARS
EFFECT OF GIBBERELLIC ACID ON THE YIELD OF PARTENOCARPIC AND STENOSPERMOCARPIC GRAPE CULTIVARS
The aim of this study was to determine the effects of gibberellic acid (GA₃) on yield of table grape cultivars at the relationships structure-function: Leaf ÷ Yield. The GA₃ was applied in “Flora”, “Talisman” and “Kishmish luchistii” grapevine cultivars by spraying clusters 4-6 days after full bloom. The GA₃ treatments were at the 0 (control); 20; 40; 50; 60; 80; 100 ppm. The application GA₃ changes of grape yield, bunch compactness parameter, and quality of grape berries. Permissible values of ratio Leaf ÷ Yield will be equal to 0.8 m² for ripeness under normal conditions of 1 kg of table grapes. In “Flora”, “Talisman” and “Kishmish luchistii” cultivars at the cordon trained system with a density of 2222 vines ÷ ha (3×1.5 m), the increase of the yields and quality of table grape occurred after the use of 40 ppm of GA₃ with one application after full bloom and norms 8-10 clusters per vine.
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