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The interpretation and application of two types of P isotherms were elucidated by means of sorption-desorption graphs of two surface soil samples. The isotherm expressing the retention or removal of P as a function of P application indicates the direction and extent of reactions at a given initial stage. The isotherm describing the sorption or desorption as a function of P concentration in the final solution after events illustrates the P buffering power of the soil. By using simultaneously the isotherms of both types, all information included can be integrated and the graphs can be used as a dynamic model describing P exchange.

agricultural and food science

Relationship between phosphorus intensity and capacity parameters in Finnish mineral soils: I Interpretation and application of phosphorus sorption-desorption isotherms