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Phosphorus and Aluminum Interactions in the Acidification of Soils
Author(s) -
Pratt P. F.
Publication year - 1961
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1961.03615995002500060015x
Subject(s) - solubility , soil water , chemistry , soil acidification , phosphate , phosphorus , environmental chemistry , soil ph , inorganic chemistry , soil science , geology , biochemistry , organic chemistry
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 NH 4 F‐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.