Phosphorus fractions and its taxonomic relationship with soils from Argentinean subtropics.

摘要

The aim of this work is to establish if phosphorus fractions, along with other edaphic attributes, contribute to differentiate Alfisols, Ultisols and Oxisols soils. Samples by horizons were taken determining physical and chemical variables and they were fractioned: phosphorus, iron, manganese and aluminum. Multivariate analysis was applied. The aluminum and the interchangeable acidity were those of greater discriminatory importance, like those variables related to the acidity. The P forms accompany the main ones. The organic P occluded in microaggregates and the residual organic P differentiates to Alfisols from Ultisols and Oxisols.