https://doi.org/10.37229/fsa.fjas.2026.05.10

The present investigation was achieved 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 orchard located at Beni Mazar district, El-Minia Governorate, Egypt.  The soil texture in the farm was sandy loam and irrigated by using drip irrigation system. Ten treatments from Potassium citrate and Boric acid as well as their combination were examined. The obtained results indicated that foliar spraying of Potassium and Boron play an essential role in improving nutritional status and productivity of Crimson grapevines. 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 nutritional status and vine productivity, 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.