ABSTRACT The experiment is about the effect of Potash ferti- lizer on the Potato (Solanum tuberosum L.) yield of Gra- nola variety that was conducted from October, 16th 1988 until January, 17th 1989 in Getasan, Semarang by the soil type is Andosol and the altitude is 1450 m. Seven kinds of the treatment are, control, 50, 100, 150, 200, 250, and 300 kg K20/ha. The design is R…