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Estimating Soil Phosphorus Requirements and Limits from Oxalate Extract Data

University of Kentucky, Soil & Water Biogeochemistry Laboratory, Dep. of Agronomy, N-122 Agricultural Science Building North, Lexington, KY 40546-0091

View larger version (21K): [in a new window]   Fig. 1. Phosphate sorption isotherms for four soils fitted by the Tempkin equation adjusted for native sorbed P. The arrow shows the location of the soil phosphorus requirement (Preq) to reach 1 mg P L-1 in equilibrium solution.

View larger version (33K): [in a new window]   Fig. 2. Relationships between soil phosphorus requirements (Preq) to reach (a) 0.2 mg L-1 and (b) 1 mg L-1 in soil solution and the sum of oxalate-extractable Fe and Al (mmol kg-1).

View larger version (23K): [in a new window]   Fig. 3. Relationships between (a) the base term q and (b) the exponential term r of the equation relating the sum of oxalate Fe and Al (mmol kg-1) with soil P requirements, and desired P levels in soil solution (mg L-1).