Soil phosphate desorption by successive extractions with iron oxide‐impregnated paper strip

Abstract

The kinetics and amount of phosphorus (P) release from five Italian soils with and without added P, were assessed by a successive soil ? extraction procedure using iron (Fe) oxide‐impregnated paper strips to characterize the residual effectiveness of added P. Following ? application to soils (0, 25, 50, and 100 mg kg^‐1 soil), ? removed in the first extraction (strip ?), ? released in ten extractions (total P), and soil ? Sorption saturation (?_saturat) increased for all soils. The rate of ? release decreased with successive strip extraction of soil [Strip P=a*(extraction number)^b; R² of 0.89–0.99], with the exponent b decreasing as the saturation of soil ? sorption capacity increased. Both initial ? and total ? released to strips increased with soil ? saturation.

Notes

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