https://doi.org/10.37229/fsa.fjb.2026.05.30

The current study was carried out during two consecutive seasons of 2023 and 2024, by using thirty uniforms in vigor, nine years old own rooted ‘Crimson Seedless’ grapevines. The chosen vines were grown in private vineyard located at Beni Mazar district, El-Minia Governorate – Egypt.  The soil texture was sandy loam and it irrigated by using drip irrigation system. Ten treatments from Potassium citrate (at 0.5%, 1.0%, and 1.5%) and Boric acid (at 50, 100, and 150 ppm) as well as their combination were examined. The obtained results showed that foliar spraying of Potassium and Boron play an essential role in improving cluster physical properties and berry physicochemical characters of ‘Crimson Seedless’ grape. The individual treatments with Potassium showed noticeable superiority over Boron treatments. Moreover, the combined application with Potassium and Boron surpassed the individual application of each one. In order to improve the physicochemical properties of Crimson Seedless cluster physical properties and berry physicochemical properties it is recommended to spray Potassium in form of potassium citrate at 1.5% and Boron in form of boric acid at 150 ppm three times yearly.