Distribution of phosphorus in columns of very sandy soils after leaching with water or diammonium phosphate solutions
1982
SORENSEN, R. C. | Wiese, R. A.
Columns of three sandy soils were leached with water after surface applications of diammonium phosphate (DAP) or with solutions containing DAP. Final concentrations of Bray and Kurtz extractable P and, for two soils, exchangeable K were measured. Substantial amounts of P and K were leached downward. Where large amounts of water were applied and DAP was added in dry form, some native P was removed from all soils. For the most part, the P distribution patterns were similar for the three soils, but the magnitude of effects of P and water (solution) rate varied. Generally, the amount of P extracted was linearly related to the amount of applied P, whereas it was curvilinearly related to the amount of applied water. Large amounts of K were leached through columns of one soil. The amount of extractable K remaining in the column was linearly related to P applied and logarithmically related to the amount of water (solution) applied.
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