Monopotassium Phosphate Foliar Application and Bunch Thinning Enhances Growth and Physical Attributes of ‘Flame Seedless’ Grapes

Elaidy, Ahmed Attia; Abd El-Khalek, Ahmed Fathy; El-Mogy, Shimaa M.; El-Hoseny, Nabil Ibrahim

doi:10.21608/jsaes.2025.425001.1180

Monopotassium Phosphate Foliar Application and Bunch Thinning Enhances Growth and Physical Attributes of ‘Flame Seedless’ Grapes

Document Type : Original research paper

Authors

¹ Horticulture Department, Faculty of Agriculture, Tanta University

² Viticulture Department, Horticulture Research Institute, Agricultural Research Center, Giza, Egypt

³ Department of Horticulture, Faculty of Agriculture, Tanta University

10.21608/jsaes.2025.425001.1180

Abstract

The present investigation was carried out during two seasons in 2023 and 2024; ten-year-old "Flame Seedless" grapevines were grafted on "Freedom" grape rootstocks at the El-Baramon experimental farm in the Dakahlia Governorate. The whole vine was sprayed with monopotassium phosphate at 3 g/L until runoff at three different times: 2 weeks after the beginning of vegetative growth, when shoot length reached about 25–30 cm, after berry set, and at the beginning of berry coloring (véraison stage), bunch thinning was performed by leaving 30 bunches per vine after the fruit set .The results showed that all conducted treatments were effective in improving vegetative growth and physical properties of bunches and berries of ‘Flame Seedless’ as compared with the control. Moreover, foliar application with monopotassium phosphate (MKP) at a rate of 3 g/l and thinning 30 bunches per vine in grapevine improvement vegetative growth, cluster weight, cluster length, width, berry weight, firmness, length, and width.

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