The experimental results indicated that tested soil is poor in potassium, it is one of factors limiting water spinach yield, there was not enough nutrition if only manure was applied on water spinach. The application of potassium increased water spinach yield by 155.13% , over NP treatment, the manure was combined with chemical fertilizer the yield was increased by 8.57% and 110.65% than the treatment with chemical fertilizer and treatment with manure only, respectively. The N, P, K nutrition was absorbed by water spinach was increased.