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Fig. 7. Frequency distribution of degree of P saturation via the oxalate method (DPSox) (a, b, c) and Mehlich 3 [P/(Al+Fe)] (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 DPSox and Mehlich 3 [P/(Al+Fe)] data in each interpretive category.
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