The effect of NPK fertilizer (1:2:1) on the weight per fruit, yield per plant and chemical constituent of Golden Delicious apple was studied in three localities of N.W.F.P. It was found that locality and fertilizer application had no significant effect on the weight per fruit. The yield per plant was not significantly affected by fertilizer. However, significant difference existed due to locality. Fertilizer treatment decreased the moisture, acidity and Vitamin C content of apple, while soluble solids, sugar and mineral matter were increased. The quality of apple fruits was improved due to wider sugar-acid ratio.