Fig. 3 Time course for change in NO₃–N and NH₄–N concentrations in the 0- to 20-cm soil zone in Exp. 1 for (a) control plots (CT) with no nutrient addition; and (b) plots amended with liquid swine waste (W) or NH₄ plus glucose (NC). Each data point represents the mean (±1 SD) for triplicate plots for each treatment. Error bars fall within the symbols in (a). Ordinal scales are similar in (a) and (b) to facilitate comparison

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