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Evaluation of phosphorus sorption capacity and phosphorus extractants for assessing phosphorus requirements of maize in western nigeria savanna soils


Evaluation of phosphorus sorption capacity and phosphorus extractants for assessing phosphorus requirements of maize in western nigeria savanna soils



Communications in Soil Science and Plant Analysis 13(4): 295-308



ISSN/ISBN: 0010-3624

Most of the P extractants developed for soils in temperate countries have not been able to successfully predict P requirements of crops in the tropics. Some workers have, however, suggested the use of sorption capacity at standard equilibrium P concentration to estimate fertilizer P requirements. P sorption capacity (psc), determined at 0.2 and 2.0 .mu.g/ml equilibrium P concentrations, were evaluated by greenhouse and field fertilizer experiments on savannah soils of western Nigeria. Correlation coefficients between psc at 0.2 and 2.0 .mu.g/ml P and yield attributes were very low and not statistically significant. The sorption values were also not able to predict P requirement in these soils because psc, and therefore, buffer capacity were low, difficult to measure accurately and did not approximate values required for maximum crop yields. Field P rates usually exceeded P requirements obtained from psc measurements. However, extractants which were able to indicate P status and availability in the soils correlated significantly with yield. It is suggested, therefore, that soil tests with suitable P extractants in addition to fixation studies which would evaluate P needed to increase soil P to a given level would have to be investigated for meaningful fertilizer recommendations.

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Accession: 005400456

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