Phosphorus availability in an Oxisol in pastures grown in Southern Brazilian Amazonia

The objective of this study was to verify and compare the P availability in an Oxisol cultivated with Megathyrsus maximus cv BRS-Zuri Urochloa decumbens Basilisk predict best soil extractor pastures Southern Amazonia. Two experiments were carried out, one grass other Signal grass. experimental design randomized blocks five doses P2O5 based on maximum capacity adsorption (MCAP), corresponding 0, 3, 6, 12 24% MCAP, 54, 108, 216 432 kg ha-1 P2O5, four replicates. In each cut grasses determined dry mass, accumulation leaf by Mehlich-1 resin extractors verified available P. There effects variables analyzed both grasses. appropriate class 14.6 mg dm-3 (BRS-Zuri) 7.2 (U. decumbens) dm-3, 20.5 14.40 decumbens). yielded highest correlation indexes between PR content.