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Pyrophosphate as a source of phosphorus for maize in some acid soils from southern Nigeria

Published online by Cambridge University Press:  27 March 2009

F. O. Uzu ,
E. J. Udo  and
A. S. R. Juo
F. O. Uzu
Affiliation:
Department of Agronomy, University of Ibadan, Nigeria
E. J. Udo
Affiliation:
Department of Agronomy, University of Ibadan, Nigeria
A. S. R. Juo
Affiliation:
International Institute of Tropical Agriculture, Ibadan, Nigeria
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Summary

Hydrolysis and sorption reaction of pyrophosphate (PP) in soils and uptake of PP by maize were studied using some acid soils from southern Nigeria. Rate of hydrolysis varied with the soil type, and half-lives of hydrolysis ranged from 10 to over 40 days in unsterilized soils and more than 40 days in all cases when the soils were sterilized. An appreciable fraction (over 40%) of the added PP resisted hydrolysis, the effect being more pronounced in the sterilized soils.

Sorption of both PP and orthophosphate (OP) by soils followed the Langmuir isotherm. The adsorption capacity and bonding energy index for all soils were greater for PP than for OP.

A short-term glasshouse experiment showed that PP was as good as OP as a source of P to maize. When the soils were limed to pH 6, PP appeared to be superior to OP.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 100 , Issue 2 , April 1983 , pp. 477 - 483
Copyright
Copyright © Cambridge University Press 1983

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