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Flow and distribution of phosphorus in soils from a geochemical and agronomic approach

Abstract:

The residual effect of the added fertilizer phosphorus is described by two reactions, an initial fast reaction and a subsequent slow one, the magnitude of which is dependent on the phosphorus retention capacity of the soil. This suggests that the P added to the soil is subject to reactions (precipitation/dissolution, adsorption/desorption, immobilization/mineralization) that condition its distribution among the fractions that make up the soil phosphorus system, depending on the soil retention capacity and the characteristics of the fertilizer source (soluble and insoluble). In this way, the agronomic availability of phosphorus, estimated through routine laboratory methods, is the result of the distribution and subsequent balance of phosphorus added between the fractions that make up phosphorus in soils.