Effect of Spraying Organic Acids on Growth and Fruiting of Crimson Seedless Grapevines Grown in Sandy Soil

This study was conducted through 2023 and 2024 seasons on Crimson seedless grapevines grown in a private vineyard located at west El- Kossia district, Assiut Governorate, Egypt to investigate the effects of three organic acids (citric, ascorbic and salicylic acids) each at 0.05 to 0.1% on vegetative growth, vine nutritional status, the yield per vine, percentage berry colouration and fruit quality. Treated vines any one of three organic acids namely citric ascorbic or salicylic acids were very effective in enhancing some growth aspects, vine nutritional status, yield, colouration % and quality of berries compared to the control treatment. The promotion was related to the application of salicylic acid, ascorbic and citric acids in descending order. Conclusively: treating Crimson seedless grapevines three times (at growth start, just after berry setting and at three weeks later) with salicylic acid at 0.1% is the best treatment yield, improved percentage berries colouration and gave height fruit quality under the circumstances of this region