The Effect of Green Waste Compost on Nitrous Oxide Production Under Different Temperatures.

Agricultural soil is a major source of the increased N₂O in atmosphere, accounting for 60% of the global annual emission. Green waste compost as soil organic amendments affect N₂O emissions by either providing N substrate through compost mineralization or decreasing N availability through immobilization. We conducted a 15 days’ laboratory experiment to investigate the effect of compost application on N₂O production under different temperatures. In the soils treated with 50 or 100 mg N kg^-1fertilizer, the application of compost increased the total N₂O emissions by 89 or 97% under high temperature (35°C), by 207 or 69% under room temperature (25°C), and by 99 or 229% under low temperature (15°C) compared to no compost treatments, respectively. The application of compost didn’t significantly affect soil inorganic N content in all the N and temperature treatments. The net nitrification rates were promoted by the compost application by an average of 26, 12 and 35% at 15, 25 and 35°C, respectively. Results indicate that temperature is an important factor determining the effect of compost application on N₂O production processes.