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Distribution and Chemistry of Phosphorus in an Albaqualf Soil After 82 Years of Phosphate Fertilization¹

ABSTRACT

The distribution of P in a fertilized and unfertilized Mexico silt loam soil was measured. After 82 years of P fertilization, the added P was found in Ap (0–23 cm), smaller amounts in the A and B, and B₂ (23–86 cm), and large amounts in the B₃ and upper C (86–137 cm) horizons. In the fertilized soil the distribution of P, particularly inorganic and available, was similar to that of original P in the soil profile.

The P adsorption capacities of fertilized and unfertilized soils were similar. These data indicated that the soil fertilized with P for 82 years had nearly double the total P content, but the ability of the soil to adsorb additional P was the same. Ion products indicated that the P level in the soil solution was controlled by the solubility of strengite.

Key Words: groundwater pollution • phosphate • phosphorus fixation • phosphorus compounds • phosphorus removal • soil chemistry • soil profile • soil treatment • and sorption

¹ Contribution from the Missouri Agr. Exp. Sta., Journal Series Number 6416. Approved by the Director. Supported by the Dept. of Interior, Office of Water Resources Research, project A-031-Missouri administered through the Missouri Water Resources Center.

² Research Assistant and Associate Professor of Agronomy, respectively.

Received for publication June 15, 1972.