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Fig. 2. Relationship (P < 0.001) between the constant a for the equation describing the successive release of resin P and initial resin P for soils incubated with no P addition (circles) or with poultry litter (diamonds), cattle slurry (asterisks), sewage sludge (triangles), or KH2PO4 (squares). The solid line is the linear regression of the constant a on resin P and the broken line represents the 1:1 line.
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