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Kinetics of phosphate release from soil and its uptake by wheat

Published online by Cambridge University Press:  27 March 2009

B. S. Brar  and
A. C. Vig
B. S. Brar
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana 141 004, India
A. C. Vig
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana 141 004, India
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Summary

Laboratory and glasshouse experiments were conducted to study P release kinetics and uptake of P by wheat (Trilicum, aestivum L.) in ten benchmark soils of Punjab (India). Phosphorus desorption, determined by successive extraction with 0·01 m-CaCl2 solution, was lower in calcareous soils (group I) than in non-calcareous soils (group II). Desorption of surface P in soils followed pseudo-first-order kinetics. The values of the kinetic constant of desorption and the radial diffusion coefficient of P increased with the amount of added P in soils.

A significant linear relationship between cumulative desorbed P and both dry-matter yield and P uptake indicated that the rate of release of P from the solid matrix is important in determining P uptake by wheat crop. Phosphate uptake was less dependent on the initial solution P concentration than on the rate of phosphate release.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 110 , Issue 3 , June 1988 , pp. 505 - 513
Copyright
Copyright © Cambridge University Press 1988

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