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Phosphorus in calcareous soils. IV. —nature of and factors influencing the fixation of added phosphate
Author(s) -
Sen Gupta M. B.,
Cornfield A. H.
Publication year - 1963
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.2740141206
Subject(s) - phosphate , calcareous , chemistry , calcium carbonate , calcium , apatite , carbonate , calcareous soils , phosphorus , soil water , environmental chemistry , phosphorite , mineralogy , inorganic chemistry , geology , soil science , biochemistry , organic chemistry , paleontology
Water‐soluble phosphate added to a soil high in calcium carbonate (16–5%) was fixed largely in easily‐replaceable and non‐apatite calcium phosphate forms; in a soil low in calcium carbonate (0–15%) fixation occurred in these forms and also as aluminium‐ and iron‐bound phosphate. No phosphate was fixed in either soil in the apatite form. The percentage of added phosphate fixed increased with time and usually decreased with increasing amount of added phosphate. In 8 soils with calcium carbonate ranging from 0.51% to 47.2%, the extent of fixation of added phosphate was poorly correlated with % of calcium carbonate, but was better correlated with clay content.