ABSTRACT The research about the effect of Grand-K ferti- lizer dose and the number of fruits on yield of water melon (Citrullus vulgaris, Scard) had been done since July 10th to October 17th 2000 at Bojong village Mungkid District, Magelang Regency, Central Java. The kind of soil is regosol and the altitude is 350 meters. The research uses experiment in randomized complete block design, facto…