Influence of Application Time and Gibberillic Acid Concentration on ‘Seyval Blanc’ Grapes
DOI:
https://doi.org/10.71318/apom.2004.58.4.220Abstract
Gibberellic acid (GA 3) applied at bloom was more effective than an application four weeks after bloom in reducing cluster weight and yield and increasing juice soluble solids. Cluster weight, good berries per cluster, and berries with rot were increased by hand-thinning at bloom. Cluster weights compared to unthinned vines were decreased linearly as GA 3concentration increased. Berry weight increased and berries per cluster decreased linearly with increasing rates of GA 3. The effects of GA 3on clusters per vine and juice titratable acidity were inconsistent over the three-year study. Juice soluble solids increased with increasing GA concentration with a similar effect on pH in two out of three years. Although an optimum concentration was not determined, GA 3at approximately 60 ppm resulted in a response similar to hand-thinning in reducing yield and improving juice quality.
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