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Differences in Phosphorus Retention and Release in Soils Amended with Animal Manures and Sewage Sludge

Dep. of Soil Science, The Univ. of Reading, Whiteknights, P.O. Box 233, Reading RG6 6DW, UK

View larger version (100K): [in a new window]   Fig. 1. Resin P released from soils incubated with no P addition (circles) or with poultry litter (diamonds), cattle slurry (asterisks), sewage sludge (triangles), or KH2PO4 (squares) during successive extractions.

View larger version (17K): [in a new window]   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.

View larger version (18K): [in a new window]   Fig. 3. Relationship (P < 0.001) between the constant b 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).

View larger version (19K): [in a new window]   Fig. 4. Relationship (P < 0.001) between the constant b for the equation describing the successive release of resin P and exchangeable Ca for soils incubated with no P addition (circles) or with poultry litter (diamonds), cattle slurry (asterisks), sewage sludge (triangles), or KH2PO4 (squares).

View larger version (17K): [in a new window]   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).

View larger version (22K): [in a new window]   Fig. 6. Relationship (P < 0.001) between exchangeable Ca and P sorption index for soils incubated with no P addition (circles) or with poultry litter (diamonds), cattle slurry (asterisks), sewage sludge (triangles), or KH2PO4 (squares).