Foliar applications of ascorbic and citric acids with soil application of humic acid to improve growth, yield, and fruit quality of grape

Document Type : Original Article

Author

Department of Horticulture, Faculty of Agriculture, Al-Azhar University, Cairo, Egypt.

Abstract

The purpose of this study is to see how foliar applications of ascorbic acid and citric acid, as well as soil applications of humic acid, affect Superior seedless grapevine growth, yield, and fruit quality in both seasons of 2021 and 2022. This research was carried out at a private orchard in Al-Khatahtbah-Sadat, Menoufia Governorate, Egypt. The vineyard was planted at a distance of 2 x 3 meters apart under drip irrigation and trellised using the Spanish Parron technique, which resulted in 12 spurs with ten eyes each. The treatments were as follows: control (untreated vines), foliar ascorbic acid and citric acid at concentrations 1200 and 1300 PPm for each, and soil humic acid addition at concentrations 1.5 and 2 kg/fed. and varied combinations of them. All treatments significantly improved characteristics of vegetative growth such as shoot length, leaf development, leaf area, number of leaves/shoot, fresh weight, and dry weight, total chlorophyll content, as well as cluster characteristics, berry physical parameters, berry biochemical characteristics, and yield. The results cleared that increasing rates of ascorbic acid, citric acid, and humic acid were followed gradually by an increase in all studied parameters.

Keywords

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Main Subjects

Al-Azhar Journal of Agricultural Research
Volume 48, Issue 2
December 2023
Pages 129-139

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