Summary
Sixty surface soils collected from major soil classes in the western Nigeria savannah were cropped to maize 6 times in succession without P fertilization. Dry matter yields, %P and P uptake decreased significantly until the sixth cropping. Organic matter decreased with cropping but no significant loss in total P was recorded. Inorganic P and saloid-bound P decreased, while organic P, Al-P, Ca-P and Fe-P increased. All the changes had little or no relationship with yield and P uptake while contributions from saloid-bound and Al-P utilization by maize were indicated. Bray's P1 available P decreased until the fourth cropping, but increased afterwards. The increase notwithstanding, lower correlations were obtained with yield and P uptake of the succeeding crops.
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Ayodele, O.J. Effect of continuous maize-cropping on yield, organic carbon mineralization and phosphorus supply of savannah soils in western Nigeria. Biol Fert Soils 2, 151–155 (1986). https://doi.org/10.1007/BF00257594
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DOI: https://doi.org/10.1007/BF00257594