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Phosphate, aluminium and iron in the soil solution of three different soils in relation to varying concentrations of citric acid
Author(s) -
Gerke Jörg
Publication year - 1992
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19921550417
Subject(s) - citric acid , podzol , chemistry , solubility , soil water , oxisol , phosphate , inorganic chemistry , mole , nuclear chemistry , environmental chemistry , biochemistry , geology , organic chemistry , soil science
Several plant species excrete di‐ and tricarboxylic acids as a reaction to P and Fe deficiency. Therefore, the effect of citric acid on P, Al, and Fe soil solution concentrations of three soils was investigated in an incubation experiment. Citric acid additions of 10–50 μmole/g soil increased P, Al, and Fe solubility. The effect was strongly pronounced in the podzol with humic‐P complexes as the main P fraction. The maximum increase was about 80 μmole P/L in the luvisol, 500 μmole P/L oxisol, and 3000 μmole P/L in the podzol. The Fe and Al solubility increased parallel to that of P with a ratio of Fe+Al solubized /P solubized of 10 or more. The solubization effect by citric acid was strong even after 90 days. Possible solubization reactions are discussed.