This paper presents the results of three N, P, K, S mineral fertilizer trials on wheat (Triticum aestivum L.), carried out in 1969, 1970 and 1971 at Monte Alegre do Sul, SP, on a massapê type of soil. The responses observed in these trials present a highly significant effect to nitrogen, a little effect to phosphorus, and significant effect to potash. Every 30 kg N/ha increased 215 kg/ha the production. The effect of sulphur increased 10% the production in relation to the check treatment and 11% in relation to the complete mineral fertilizer. The quantities of N-P-K fertilizer to be applied for massapê type of soil were calculated for several relationships between wheat and fertilizers prices.