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Relationship between Soil Test Phosphorus and Phosphorus in Runoff

Effects of Soil Series Variability

^a USDA-ARS, National Soil Tilth Laboratory, Ames, IA 50011
^b 4119 Plant Sciences, Department of Crop and Soil Sciences, University of Georgia, Athens, GA 30602
^c Natural Resources Conservation Service, 1220 Lafayette Parkway, Lagrange, GA 30241

View larger version (32K): [in a new window]   Fig. 1. Relationship between dissolved reactive phosphorus (DRP) in runoff and four measures of soil P (Mehlich III, deionized water, Fe2O3 paper, and degree of phosphorus saturation [DPS]) from samples collected over three depths (0–2, 0–5, and 0–10 cm).

View larger version (33K): [in a new window]   Fig. 2. Relationship between total P in runoff and four measures of soil P (Mehlich III, deionized water, Fe2O3 paper, and degree of phosphorus saturation [DPS]) from samples collected over three depths (0–2, 0–5, and 0–10 cm).

View larger version (21K): [in a new window]   Fig. 3. Relationship between soil P extracted by deionized water and normalized (concentration divided by runoff depth) dissolved reactive phosphorus (DRP) in runoff.

View larger version (21K): [in a new window]   Fig. 4. Relationship between soil P extracted by deionized water and normalized (concentration divided by runoff depth) total P in runoff.

View larger version (30K): [in a new window]   Fig. 5. Relationship between percent soil P saturation and dissolved reactive phosphorus (DRP) in runoff when sites are split into groups based on oxalate-extractable Fe to Al ratio.