Figure 1. Cumulative N₂O emissions in response to soil conditions in pot microcosm incubation experiments.

(a), N₂O emission as a function of soil water filled pore space (WFPS). CK denotes control treatment. U denotes applied urea at a rate of 40 mg N kg⁻¹. US denotes application of urea with comminuted wheat straw. (b), N₂O emission as a function of NH₄⁺-based fertilizer (ammonium sulfate) input rate at 70% WFPS. (c), Effect of nitrogen (urea), carbon source (comminuted wheat straw), and nitrification inhibitors (DMPP and DCD) on soil N₂O emission at 70% WFPS. DMPP and DCD denote 3,4-dimethylpyrazole phosphate and dicyandiamide, respectively. Error bars in plots (a–c) are standard deviation of the mean (n = 3 replicates).