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Nitrous Oxide Emissions From Global Cropped Mineral Soils and Mitigation Strategies.

Tuesday, November 5, 2013: 10:05 AM
Tampa Convention Center, Room 19, First Floor

Zhengxi Tan, Science, ARTS at USGS EROS, Sioux Falls, SD and Shuguang Liu, Science, USGS EROS, Sioux Falls, SD
Nitrous oxide (N2O) emissions from the agricultural sector contribute more than 80% of the global anthropogenic N2O emissions and can affect the trend of the net global warming potential (GWP) because of N2O’s much higher GWP than other greenhouse gases’. We evaluated N2O emissions from global cropped mineral soils by performing meta-analysis on published field observations with an emphasis on the growing season (GS) emission rate. Our results show that GS N2O emission is dominantly subject to manageable factors and its spectrum can more realistically reflect the uncertainty of farming activity-induced emission compared to the annual estimate, and thus can help land managers develop mitigation strategies. Our results also suggest that using low emission fertilizers and optimizing the application rate and method based on both cropping system and soil conditions could feasibly mitigate fertilizer-derived N2O emissions and be critical for sustaining the agriculture that relies increasingly on N fertilization. More studies are needed to find out to what extent N inhibitors and N fertilizers that have a low emission rate can be expanded and to determine their impacts on soil quality.
See more from this Division: ASA Section: Environmental Quality
See more from this Session: Nitrous Oxide Emissions From Agricultural Practices: II

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