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Fig. 3. The enrichments of NH4+, NO3, NO2, and N2O during Experiment 3 in the bulk soil irrigated and labeled with (a) fresh water (FW) and 15NO3, (b) FW and 15NH4+, (c) reclaimed effluent (RE) and 15NO3, and (d) RE and 15NH4+. Error bars are the standard errors of the means (n = 3) or are smaller than symbols.
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