http://oar.icrisat.org/id/eprint/4000 2011-11-16T14:17:47Z info:eu-repo/semantics/descriptiveMetadata http://oar.icrisat.org/4000/ Phosphate retention and extractability in soils of the humid zone in West Africa Abekoe, M K Sahrawat, K L Soil Science Fertilizer Applications 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. Elsevier 2001 Article PeerReviewed application/pdf en http://oar.icrisat.org/4000/1/Geoderma_102_1-2_2001_175%E2%80%93187.pdf 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 http://dx.doi.org/10.1016/S0016-7061(00)00110-5 info:eu-repo/semantics/objectFile info:eu-repo/semantics/humanStartPage