Fig. 2. The fraction of the flux attributed to either nitrification or denitrification, the apparent enrichment of the denitrifying pool (a_p), and the N₂O atom % excess at each sampling time in lysimeters labeled with ¹⁵NO₃ and irrigated with (a) fresh water (FW) and (b) reclaimed effluent (RE). Data represent means and standard deviations (n = 3).