Fig. 2. Median Mehlich 3–extractable P concentrations of soils used for established warm- and cool-season grasses (a) and row-crop (b) production from 1995 to 2002 from University of Arkansas soil test data summaries (DeLong et al., 1996, 1997, 1998, 1999, 2000, 2001, 2002, and 2003).