ABSTRACT A recearch of the effect to of dose of NPK and number of fruit per plant or yield of water-melon (Citrulin vulgazis, Board), had been carried out in August until October, 1999 at Kalisalak villaga salaman Distric Magelang regency Central Java. The soil type ia istosol with pH 6,5 and the altitude 360 meters. The recearch metode is factorial 15 x 3) with randomized complate block desig…