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Kinetics of soil phosphate desorption as affected by citric acid
Author(s) -
Gerke Jörg
Publication year - 1994
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.19941570104
Subject(s) - desorption , podzol , chemistry , rhizosphere , phosphate , diffusion , kinetics , citric acid , inorganic chemistry , analytical chemistry (journal) , environmental chemistry , biochemistry , soil water , soil science , geology , organic chemistry , adsorption , thermodynamics , paleontology , physics , quantum mechanics , bacteria
Citrate can accumulate in the rhizosphere of phosphate (P) deficient plants. Therefore, P desorption was investigated in relation to citrate concentrations applied in a single or sequential mode to a Luvisol and a Podzol. Cumulative P desorption increased up to 20 times that of the control, the absolute increase being higher in the Podzol. The rate of P release was closely related to the rate of Fe+Al release indicating that desorption originated mainly from Fe/Al associated P. The mode of citrate loading affected the P desorption in an ambiguous manner. P‐diffusion coefficients were calculated from the desorption data. The coefficients strongly increased with citrate loading, the increase being more pronounced in the Podzol.