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SL333: An Indicator for Risk of Phosphorus Loss from Sandy Soils

Figure 1. Relationship between the concentration of water-soluble P (WSP) and the P saturation ratio calculated from P, Fe, and Al in a Mehlich 1 extract (PSRM1) for manure-impacted surface (A) and subsurface (E) horizons. Threshold PSR value is significant at the 0.001 probability level (Nair et al. 2004).