Fig. 2. (a) Mehlich 3–extractable phosphorus (M3-P) and water-extractable phosphorus (Pw) concentrations with depth in the Autryville and Blanton soils (95% confidence limits [CL] represent ±43 and ±3 mg kg–1 M3-P and Pw, respectively) and (b) total phosphorus (TP) and oxalate-extractable phosphorus (Pox) concentrations with depth in the Autryville and Blanton soils (95% confidence limits [CL] represent ±74 and ±56 mg kg–1 TP and Pox, respectively).