Fig. 6 Time course for change in NO₃ and NH₄ concentrations in the 0- to 20-cm soil zone for plots fertilized with: (a) NH₄–N; and (b) NO₃–N. Treatment codes are as follow: NH4H, high NH₄; NH4L, low NH₄; NO3H, high NO₃; NO3L, low NO₃. Each data point represents the mean (±1 SD) for triplicate plots amended with high (150 kg N ha^-1) or low (75 kg N ha^-1) concentrations of nutrient

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