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An Environmental Threshold for Degree of Phosphorus Saturation in Sandy Soils

Statistics Department, 522 McCarty Hall, University of Florida, Institute of Food and Agricultural Sciences, Gainesville, FL 32611-0510

View larger version (21K): [in a new window]   Fig. 1. Relationship between the concentration of water-soluble phosphorus (WSP) and the degree of P saturation calculated using an oxalate extraction (DPSOx) for manure-impacted surface and subsurface soils from the middle Suwannee River basin.

View larger version (22K): [in a new window]   Fig. 2. Relationship between the concentration of water-soluble phosphorus (WSP) and the degree of P saturation calculated using a Mehlich-1 extraction (DPSM1) for manure-impacted surface and subsurface soils from the middle Suwannee River basin.

View larger version (23K): [in a new window]   Fig. 3. Relationship between the concentration of water-soluble phosphorus (WSP) and the degree of P saturation calculated using a Mehlich-3 extraction (DPSM3) for manure-impacted surface and subsurface soils from the middle Suwannee River basin.

View larger version (24K): [in a new window]   Fig. 4. Relationship between Mehlich-1 P and the degree of P saturation calculated using an oxalate extraction (DPSOx) for manure-impacted surface and subsurface soils from the middle Suwannee River basin. Horizontal dotted lines indicate agronomic high (30 mg P kg–1) and very high (60 mg P kg–1) soil test P concentrations in Florida (Kidder et al., 2002).