Determination of the remaining phosphorus as an alternative method to texture to the indication of the availability of phosphorus in three soils
Keywords:
clay level, iron oxides, textural class, aluminum oxides, adsorptionAbstract
In Brazilian states of Rio Grande do Sul and Santa Catarina, the estimative of evaluable P is based on soil textural class, while in other states, such as Minas Gerais, such estimative is based on remaining P analysis. The first approach is grounded in the correlation between soil clay level and its phosphorus buffer capacity, while the remaining P method evaluates P adsorption itself. The aim of the present study was to evaluate the potential of the remaining P method as an alternative to clay level to estimate P availability in the soils from Rio Grande do Sul (Ultisol, Oxisol and Vertisol). The results indicated the similarity between both methods. However, in Oxisol, it was observed a difference in P availability class depending on the method, indicating a overestimation of available P estimated by the clay method as compared to the remaining P method.
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