Fig. 6. Solid phase NO₃–N, NH₄–N, P, K, Ca, and Mg concentrations (µmol) on each of five harvest dates from (a) black cherry, (b) northern red oak, (c) and red maple pot soils from Twin Creeks and Cove Mountain. Means within a species x site combination marked with the same letter are not different based on Tukey's HSD test (P = 0.05)

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