Abstract
THIS STUDY was carried out during two successive seasons ……(2014 & 2015) in a private vineyard at El-deer village, Aga, Dakahlia Governorate, Egypt. The experiment was conducted on 12-year-old Flame seedless grapevines cultivar. The vines were grown in clay soil under surface irrigation system, trained to quadrilateral cordon using Gable supporting system. Three amino acids namely Methionine, Glutamic acid and Argenine at a rate (500 ppm) were used as a spray application either alone or with Vitamin B1 (Thiamin) or Vitamin B2 (Riboflavin) at a rate (250 ppm) on the vines for three times at growth start (when shoots length reached about 40 - 50 cm), after fruit set and 2 weeks after fruit set as an attempts to improve growth, physical and chemical properties of Flame seedless grapevines.
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