Changes in Aluminum and Phosphorus Solubilities in Response to Long‐Term Fertilization
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The objective of this study was to determine the effect of long-term fertilization on Al and P soil solution activities and to relate these activities to mineralogical components of the soil. Soil treatments were established in Manhattan, KS, on a Smolan silt loam (mesic Pachic Argiustoll) with high rates of NH4NO3 and superphosphate for >40 yr. High rates of NH4 applied to these soils decreased the soil pH from 6.9 to 4.1. Phosphorus fertilization did not affect Al solubilities but increased P activities to apparent equilibrium with tricalcium phosphate and Al phosphates. Aluminum solubilities in the N-treated soils were undersaturated with respect to Al oxides, Al oxyhydroxides, Al hydroxides, and all phosphate minerals but may have been in equilibrium with montmorillonite. -from Authors
author list (cited authors)
Hetrick, J. A., & Schwab, A. P.