Fig. 7. Average effect of incubation matric potential on (a) total gaseous N emission, (b) electrons consumed (c) NO + N₂O as a proportion of total N gases, and (d) electrons consumed per unit CO₂ produced. Both soils were preincubated aerobically at –75 kPa and then incubated anaerobically for 7 d at three different matric potentials.