Phosphate retention and extractability in soils of the humid zone in West Africa

Abekoe, M K and Sahrawat, K L (2001) Phosphate retention and extractability in soils of the humid zone in West Africa. Geoderma, 102 (1-2). pp. 175-187. ISSN 0016-7061

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Abstract

Phosphate adsorption and desorption studies provide insight for developing P management strategies. Very few studies have concentrated on P desorption which provides information on the reversibility of adsorbed P. Phosphate adsorption and desorption studies were carried out on seven rice-growing soils from three countries in West Africa, with the objective of relating these processes to P management strategies for the soils. The standard P requirement (SPR) of soils, defined as the amount of P to be added to attain an equilibrium solution concentration of 0.2 mg P l−1, varied from 42 to 175 mg P kg−1. Out of the seven soils, four required low amounts and the other three needed relatively higher P applications. The extractability of the adsorbed P in different extractants was: 0.01 M KCl 32–78%, Olsen P 21–112%, and Bray 1 P 15–40%. Differences in the amounts of P desorbed by the soils suggested that the critical P levels needed for P management must be different. Management options to increase P availability in the soils are suggested.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Phosphorus; Adsorption; Desorption; Extractability of P; Soils; Humid zone
Subjects:	Others > Soil Science Others > Fertilizer Applications
Depositing User:	Mr Sanat Kumar Behera
Date Deposited:	16 Nov 2011 14:17
Last Modified:	16 Nov 2011 14:17
URI:	http://oar.icrisat.org/id/eprint/4000
Official URL:	http://dx.doi.org/10.1016/S0016-7061(00)00110-5
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	M.K. Abekoe thanks the West Africa Rice Development Association ŽWARDA.for the award of a Visiting Scientist fellowship and support of the study. The help offered by the technical staff of the Soil Science Division of WARDA in the course of the analytical work is very much appreciated
Links:	Author

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