A study was accomplished in Mitscherlich pots about the behavior of phosphorons fertilizers, in two levels of total P2O5 and three conditions of pH of the soil, with regard to wheat and soybeans the latter being planted in order to test residual effect of the fertilizers. Of the five phosphates studied, simple and triple superphosphates were superior to the natural phosphates, as far as wheat is concerned. As for soybeans, the differences between them disappeared. In the two crops, fosfato Alvorada exceeded the average of production of fosforita Olinda and apatita Araxá. The phosphorous fertilizers reacted differently in the presence of lime. The simple and the triple superphosphates reacted better in pH equal to 5.4 and 5.3 respectively. The best strains of pH for the natural phosphates were 5.1 up to 5.3, 4.7 up to 5.0 and 4.8 up to 5.3 respectively, for Olinda fosforita, Araxá apatita and Alvorada fosfato. The productions of wheat fell from dose 1 of lime to dose 2, and the production curve had its upmost point between these two levels The effect of lime, for soybeans, was linear and highly significant, an increase of 62%being noticed from dose 0 to dose 2. A correlation between reaction to phosphorus and soil pH was established so that the behavior of the phosphorous fertilizers could be explained.