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A mechanism of phosphate adsorption on Narrabri medium clay loam soil

Published online by Cambridge University Press:  27 March 2009

H. S. Hundal
H. S. Hundal
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, Punjab-141004, India
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Summary

Phosphate adsorption on Narrabri medium clay loam soil followed a four-region Langmuir isotherm equation, i.e. the plot showed four distinct linear portions. These four regions corresponded closely to saturation with respect to hydroxyapatite, β-tricalcium phosphate, octacalcium phosphate and dicalcium phosphate dihydrate, shown by a calcium phosphate solubility diagram. The differential isosteric heat of adsorption, AH, of P adsorption on soil between 4 and 22 °C, plotted against phosphate sorbed, revealed discontinuities corresponding to the breaks in slope found on the Langmuir plot.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 111 , Issue 1 , August 1988 , pp. 155 - 158
Copyright
Copyright © Cambridge University Press 1988

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