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Fig. 5. Relationship (P > 0.05) between the constant b for the equation describing the successive release of resin P and the sum of ammonium oxalate-extractable Fe and Al for soils incubated with no P addition (circles) or with poultry litter (diamonds), cattle slurry (asterisks), sewage sludge (triangles), or KH2PO4 (squares).
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