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.
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