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Phosphorus Leaching in Manure-Amended Atlantic Coastal Plain Soils

Department of Natural Resource Sciences and Landscape Architecture, 0214 H.J. Patterson Hall, University of Maryland, College Park, MD 20742

View larger version (22K): [in a new window]   Fig. 1. Water-extractable soil phosphorus (WSP) by depth and tillage method (CH, chisel tillage; NT, no tillage) at Beltsville and Upper Marlboro after four years of dairy manure amendments (kg P ha–1 4 yr–1 load).

View larger version (13K): [in a new window]   Fig. 2. Water-extractable soil phosphorus (WSP) by depth and tillage method (CH, chisel tillage; NT, no tillage) at Queenstown after four years of broiler litter amendments (kg P ha–1 4 yr–1 load).

View larger version (17K): [in a new window]   Fig. 3. Water-extractable soil phosphorus (WSP) by depth at Poplar Hill after four years of broiler litter amendments (kg P ha–1 4 yr–1 load).

View larger version (26K): [in a new window]   Fig. 4. The relationship between water-extractable soil phosphorus (WSP) and Mehlich-1 soil test phosphorus (STP) for 0 to 2 cm at Beltsville and Upper Marlboro after four years of dairy manure amendments, and at Queenstown and Poplar Hill after four years of broiler litter amendments.

View larger version (20K): [in a new window]   Fig. 5. Degree of phosphorus saturation (DPS) by depth at Beltsville after four years of dairy manure amendments (kg P ha–1 4 yr–1 load).

View larger version (14K): [in a new window]   Fig. 6. Degree of phosphorus saturation (DPS) by depth and tillage method (CH, chisel tillage; NT, no tillage) at Upper Marlboro after four years of dairy manure amendments (kg P ha–1 4 yr–1 load).

View larger version (26K): [in a new window]   Fig. 7. Degree of phosphorus saturation (DPS) by depth and tillage method (CH, chisel tillage; NT, no tillage) at Queenstown and Poplar Hill after four years of broiler litter amendments (kg P ha–1 4 yr–1 load).

View larger version (28K): [in a new window]   Fig. 8. The relationship between water-extractable soil phosphorus (WSP) and degree of phosphorus saturation (DPS) for 0 to 90 cm at Beltsville and Upper Marlboro after four years of dairy manure amendments and Queenstown and Poplar Hill after four years of broiler litter amendments. The arrow indicates the change point.

View larger version (24K): [in a new window]   Fig. 9. The relationship between water-extractable soil phosphorus (WSP) and degree of phosphorus saturation (DPS) for 0 to 2 cm at Beltsville and Upper Marlboro after four years of dairy manure amendments and Queenstown and Poplar Hill after four years of broiler litter amendments.