Fig. 4. The NH₄, NO₃, and N₂O enrichments in soil incubated under saturated conditions with (a) fresh water (FW) labeled with ¹⁵NO₃, (b) FW labeled with ¹⁵NH₄, (c) reclaimed effluent (RE) labeled with ¹⁵NO₃, and (d) RE labeled with ¹⁵NH₄. Error bars represent the standard deviations (n = 3) or are smaller than symbols.

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