In the three experiments reported ordinary superphosphate was compared, in the presence of NK, with Olinda and Araxá phosphates (ground natural phosphates), and mixtures containing 1/3 or 1/2 of the phosphorus dosis as superphosphate, the remaining being supplied by one of the natural phosphates. These fertilizers were compared at the doses of 50, 100 and 150 kilograms of total P2O5 per hectare, on three different soil types of the State of São Paulo with pH around 5.20. Satisfactory yields and significant responses to phosphorus were obtained in the three experiments. In the average of these and of the three rates of application, the yield increases were the following: with superphosphate, 25%; with the natural phosphates, 17%; with the mixtures containing two thirds or half the phosphorus doses as natural phosphates, 22 and 29%, respectively. Practically, there was no difference between Olinda and Araxá phosphate.