Biochemical composition and antioxidant activity affected by spraying potassium sulfate in black grape (Vitis vinifera L. cv. Rasha)

The physiological and metabolic processes involved with grapevine growth and production are influenced by key macro- and micronutrients. Potassium is an essential plant nutrient that affects growth and fruit quality. In this study, the impact of foliar spraying of potassium sulfate (KSignificant increases in anthocyanin, total protein content, and antioxidant enzyme activities were observed in the berries treated twice with 3 g LThese findings suggest that K