Bio-efficacy and Phytotoxicity of Gibberellic Acid (GA3) Technical 90% for Improving Yield and Quality in Grapes (Vitis vinifera L.)

The experiment was conducted on Thompson Seedless grapevines grafted on dog ridge rootstock to study its response towards the application of gibberellic acid (GA3) Tech. 90% at different time intervals. The experiment was designed in a randomized block design (RBD) having five treatments with four replications were carried out at Maharashtra Rajya Draksha Bagaitdar Sangh, Pune during 2020-2021 & 2021 - 2022. Significant differences were observed with the applications of GA3 at different developmental stages (pre-bloom and fruit set) resulted in to increased bunch weight, berry weight, berry length, berry size, pedicel thickness, rachis length, and quality parameters viz. total soluble solids along with the highest yield per vine exogenous application of different concentrations of GA3 at different time interval schedules was beneficial for the quality and yield of Thompson Seedless grapevines.