Abstract
ABSTRACTAn incubation experiment was conducted in the laboratory for 10 weeks to study the changes in some phosphorus (P) fractions in two soil series. Poultry manure was applied at 0, 5, 10, 15, and 20 t ha−1 solely and in combination with single superphosphate (SSP) at 0, 15, 30, 45, and 60 kg P ha−1. Significant increases in all the P fractions were observed to the 6th week of incubation (WAI). Sole application of poultry manure was, however, effective in reducing P occlusion in the two soil series used. An increase in Fe–P which was the largest extractable inorganic P was observed with the application of 10 t ha−1 of poultry manure and 30 kg P ha−1 of SSP in the Iwo series and combination of 20 t ha−1 of poultry manure and 45 kg P ha−1 of SSP in the Alagba series.
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