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Fig. 3. (a) Oxalate-extractable aluminum (Alox) and iron (Feox) and (b) degree of phosphorus saturation (DPS) with depth in the Autryville and Blanton soils (95% confidence limits [CL] represent ±88 and ±30 mg kg–1 Alox and Feox, respectively, and ±8% DPS).