The phosphorus of eight soil samples, representing a very rich latosolic soil group of the state of São Paulo and Parana (Brazil), was fractioned into water soluble phosphorus; aluminum phosphate, through two extractions with 50 ml of 0.5 N ammonium fluorid solution pH = 8,5; iron phosphate, through two extractions with 50 ml of sodium hydroxide 0.1 N; and occluded phosphorus. Organic and total phosphorus were also determined in all the samples. The data showed that 35,0 to 265.7 ppm of phosphorus are bounded to aluminum (Al-P); 74.2 to 144.9 ppm of P are bounded to iron (Fe-P); 45.3 to 162.5 ppm of P are in the form of calcium phosphate and 470.8 to 850.8 are occluded phosphate. Organic phosphorus varied from 347.2 to 511.0 ppm of P and total phosphorus from 741.0 to 1493.0 ppm of P.