These studies were carried to clarify the application effect of high leveled superphosphate fertilizer and the effect to the yield and growth of rice by the application of composts enriched with superphosphate fertilizer and the results were as follows: 1) Neither statistical significance was convinced between the yield and yield component factor in each treatment in the terms of superphosphate effects, nor the additional application effect of superphosphate fertilizer was appeared. 2) In the terms of grain yield, the statistical significance was not revealed in the plots of composts applied 1000kg per 10a, of superphosphate applied 5kg, 7.5kg and 10kg per 10 a, but grain yield were 220kg in the plot of composts applied 1000 kg per 10 a, 232kg in the plot of superphosphate applied 5 kg per 10 a, 266kg in superphosphate applied 7.5 per 10a, and 243kg of 10kg $P_2O_5$ per 10a. 3) The methods of applying superphosphate and composts to rice plant making composts enriched with superphosphate fertilizer a few monath before the basal application were recommended to increase grain yield and each factor of grain component. 4) The interaction of applying composts and superphosphate was revealed that applying composts with the $P_2O_5$ was recommended. 5) Grain yields were higher in the plots of 1, 000kg of composts enriched with 7.5kg of $P_2O_5$ per 10 a, and 1, 000kg of composts with 5kg of $P_2O_5$ per 10 a other than the rest of 10 treatments. 6) Appyling composts in the test was convinced as effective results to accelerate the maturing rate.