This investigation was conducted for two consecutive seasons (2021 & 2022) in a private vineyard located at Matay center, Minia governorate to study the effect of naphthalene acetic acid (NAA) and gibberellic acid (GA₃) on yield and fruit quality of Black Magic grapevines. The chosen vines were five-year-old, grown in sandy soil, irrigated by drip system, planted at distance of 2 x 3 meters, cane-pruned and trellised by the Gable system. Eight treatments were performed as follows: three doses of NAA (25, 50 and 75 ppm) and GA₃ at 20 ppm were applied either solely or in combined with each other, in addition to the control treatment (spraying with water). All different doses of NAA were foliar sprayed twice: at the beginning of blooming stage and after fruit set stage when the berry diameter reaches 2-3 mm, while cluster dipping with GA₃ at 20 ppm was done after fruit set stage when the berry diameter reaches 8-10 mm.

       The results revealed that all different doses of NAA either solely or in combined with GA₃ at 20 ppm significantly affected the growth, yield and physical and chemical properties of berries compared to control in both seasons. The combined application of NAA at 75 ppm plus GA₃ at 20 ppm was most effective for achieving the best results in terms of enhancing all vegetative growth traits, increasing yield and its attributes as well as improving berry physical and chemical properties of Black Magic grapes.