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Effect of nitrogen and potassium fertilization on productivity and fruit quality of ‘crimson seedless’ grape Abd El-Razek, E. 1+2 *; D. Treutter 1, M.M.S. Saleh2; M. El-Shammaa2; Amera, A. Fouad2 and N. Abdel-Hamid 3 1 Fruit Science Unit and Tree Physiology, Technical University of Munich, Germany. 2 Pomology Dept., Agricultural and Biological Division, National Research Center, Egypt. 3 Horticulture Dept., Faculty of Agriculture, Ain Shams University, Egypt. * Corresponding author: emad71_9@yahoo.com ABSTRACT