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Phosphorus and Aluminum Interactions in the Acidification of Soils¹

ABSTRACT

Two soils containing relatively large amounts of basic Ca phosphates were acidified from neutrality to pH 3.5. Acidification produced high P solubility and because of this the A1 solubility remained < 1.0 ppm. for one soil and < 0.5 ppm. for the soil that had the greatest P solubility. Maximum P solubility was obtained at pH 4.2 with both soils. The high P solubility did not prevent accumulation of exchangeable A1 when the pH of the soil decreased to pH 3.5. During acidification the Ca phosphate fraction decreased about 50% in one soil and about 80% in the other. This decrease was largely balanced by an increase in NH₄F-extractable P or A1 phosphates. Acidification of these types of soils to pH values as low as 4.7 should produce little if any A1 toxicity.

¹ Paper No. 1316, University of California Citrus Exp. Sta., Riverside.

² Associate Chemist, Department of Soils and Plant Nutrition.

Received for publication November 18, 1960. Accepted for publication July 10, 1961.