Effect of spraying certain organic acids and micronutrients on growth and vine nutritional status of Early Sweet grapevines under Upper Egypt conditions.

Document Type : Original papers

Authors

1 Hort. Dept. Fac. of Agric. Al-Azhar Univ. (Assiut branch)Egypt.

2 Hort. Res. Instit. ARC, Giza, Egypt.

3 Department of Horticulture (Pomology), Faculty of Agriculture and Natural Resources, Aswan University

4 جامعه أسوان كلية الزراعة والموارد الطبيعية قسم البساتين

Abstract

This study was conducted during three seasons 2021, 2022 and 2023 on Early Sweet grapevines grown in Upper Egypt to investigate the effect of spraying certain micronutrients (Fe + Zn + Mn+ Cu) at 0.025 to 0.1% and /or any one of three organic acids (citric acid at 500 ppm or ascorbic acid at 500 ppm or salicylic acid at 50 ppm) on growth and vine nutritional status of Early Sweet grapevines grown under sandy soil. Spraying the vines three times with Micromix ( containing 6.0% Fe+ 3.0% Mn + 3.0% Zn + 1.5% Cu in chelated from) at 0.025 to 0.1% and /or any one of three organic acids ( citric or ascorbic acids each at 500 ppm or salicylic acid at 50ppm ) was very effective in stimulating shoot length , leaf area, wood ripening coefficient, pruning wood weight/ vine, chlorophyll a, chlorophyll b , total chlorophylls, total carotenoids, N, P, K (as%) , Fe, Zn, and Mn (as ppm ) of Early Sweet grapevines over the control. Carrying out three sprays of mixture of Micromix at 0.1% and salicylic acid at 50 ppm gave the best results with regard to vegetative growth characteristics and vine nutritional status of Early Sweet grapevines grown under sandy soil

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