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SOIL FACTORS AFFECTING PLANT UPTAKE OF PHOSPHATE
Author(s) -
GUNARY D.,
SUTTON C. D.
Publication year - 1967
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1967.tb01497.x
Subject(s) - phosphate , chemistry , soil water , intensity (physics) , diffusion , logarithm , adsorption , kinetic energy , cation exchange capacity , environmental chemistry , soil science , mathematics , thermodynamics , biochemistry , environmental science , physics , mathematical analysis , quantum mechanics
Summary Short‐ and long‐term uptake of phosphate by ryegrass grown in pots were both well correlated with combinations of the logarithm of the phosphate concentration in solution (log[P]), with a capacity factor ( L ‐value). It is suggested that log[P] measures an intensity/kinetic complex that takes account of intensity, rate, and diffusion factors. The best correlation with a single parameter was with phosphate adsorbed by anion‐exchange resin, which gives a good measure of the capacity factor and also some measure of the intensity/kinetic complex. On soils of normal phosphate status, the capacity factor tended to be more important, suggesting local exhaustion of labile phosphate. With enriched soils, the intensity/ kinetic complex measured by log [P] was dominant both for short‐ and long‐term uptake.