Vegetative growth, yield and berry physical and chemical quality of Thompson Seedless
grapevines grown in clay soil under El-Minia region conditions – Egypt in response to three sprays with
vitamin E at 40 ppm, citric acid at 500 ppm and folic acid at 500 ppm singly or in combination were
investigated during 2019 and 2020 seasons. spraying the three antioxidants were very effective in improving
all vegetative growth parameters (in terms of shoot lengths (cm), number of leaves/shoot and leaf area (cm2
),
one-year-old wood pruning wood (kg/vine), cane thickness (cm), Yield and berry physical and chemical
properties, rather than non- application. However, any combined application of these three antioxidants in
was remarkably superior than using each one alone, on all vegetative growth, yield and its components and
berry physical and chemical properties of Thompson seedless grapevines. Furthermore, spraying the citric
acid in combination with folic acid present superiority effect on all studied parameters than spring citric acid
in combination with vitamin E, during the two experimental seasons. The best results with regard to
vegetative growth, yield and berry quality of Thompson Seedless grown in clay soil under El-Minia region
conditions were obtained when the vines received the three examined antioxidants in combination.