Fig. 2. Mean values for the nitrogen pools of the rototilled, disked, and control soils. (a) NH₄–N, (b) NO₃–N, (c) dissolved organic nitrogen (DON), and (d) microbial biomass nitrogen (MBN). The soils were tilled at 0 h. The time of irrigation (222 h) is indicated by the vertical dashed line. The error bars are the standard error of the mean (n = 3). There were no significant differences in MBN at any time.

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