Rice is one of the main products of Mazandaran province in Iran. Ratio of nitrogen, potassium and phos phorus in soil is important to increase rice yield and improv es economic position of farmers. Fertilization is the most common way to feed soil. In this study according to data from the province's rice research institute in 2010, the optimal combination of different kinds of fertilizer for rice cultivation is obtained by using the goal progra ming. Sensitivity analysis with respect to price and value of various fertilizers in rice production, shows the optimum amount of nutrients. By using game theory the contribution of each nutrient is obtained

Keywords