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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 kg1) and very high (60 mg P kg1) soil test P concentrations in Florida (Kidder et al., 2002).
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