Determination of the remaining phosphorus as an alternative method to texture to the indication of the availability of phosphorus in three soils
Abstract
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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