Fig. 8. Frequency distribution of FeO-P (a, b, c) and water soluble P (WSP) (d, e, f) in the below optimum, optimum, and above optimum Mehlich-3-P ranges. Data are for agricultural topsoils only (n = 335). Median, mean, and standard errors apply to FeO-P and WSP data in each interpretive category.

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