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Phosphorus in calcareous soils. I. —The inorganic phosphate fractions and their relation to the amount of calcium carbonate present
Author(s) -
Gupta M. B. Sen,
Cornfield A. H.
Publication year - 1962
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740131207
Subject(s) - phosphate , calcareous , chemistry , phosphorus , carbonate , soil water , environmental chemistry , fractionation , calcium , calcium carbonate , calcareous soils , phosphorite , inorganic chemistry , mineralogy , geology , soil science , biochemistry , chromatography , organic chemistry , paleontology
In a fractionation study with six calcareous soils varying widely in carbonate content, it was observed that the amount of the different inorganic phosphate fractions expressed as a percentage of the total soil phosphorus decreased in the order ‚inert’ phosphate, apatites, non‐apatitic calcium phosphates, aluminium‐bound phosphate, iron‐bound phosphate, ‚easily‐replaceable’ phosphate. The aluminium‐bound phosphate expressed as percentage of total soil phosphorus was significantly correlated (negatively) with CaCO 3 %. The proportion of the other forms of phosphate were not significantly correlated with soil CaCO 3 content. The non‐apatitic calcium phosphate and the aluminium and iron‐bound phosphates accounted for a smaller proportion of total soil phosphorus in calcareous soils, than values given in literature for non‐calcareous soils. The ‚inert’ phosphate and the apatitic fractions accounted for a greater proportion of the phosphate in the calcareous than in the non‐calcareous soils.