101157 The Effect of Green Waste Compost on Nitrous Oxide Production Under Different Temperatures.

Poster Number 177-502

See more from this Division: SSSA Division: Soil Biology and Biochemistry
See more from this Session: Soil Biology and Biochemistry Poster I (includes student competition)

Monday, November 7, 2016
Phoenix Convention Center North, Exhibit Hall CDE

Cong Wang, Biogeochemistry and Nutrient Cycling Laboratory, Department of Land, Air and Water Resources, The University of California, Davis, Davis, CA, Xia Zhu-Barker, Land, Air and Water Resources, University of California Davis, Davis, CA and William R. Horwath, One Shields Avenue, University of California-Davis, Davis, CA
Abstract:
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.

See more from this Division: SSSA Division: Soil Biology and Biochemistry
See more from this Session: Soil Biology and Biochemistry Poster I (includes student competition)