Research on GHG Emissions in Agricultural Ecosystems
This page last reviewed July 22, 2014
To improve California's
current GHG inventory, ARB is developing research to better understand
nitrous oxide (N2O)
emissions from agricultural ecosystems under California specific
conditions. Data may be used to develop California specific baseline
emissions and improved fertilizer management practices.
ARB's GHG inventory for 2010 estimates that N2O contributed roughly 13.9 MMTCO2E, or 2.6 percent of California's total GHG emissions. Agricultural soil was the largest source of N2O, accounting for approximately 8.3 MMTCO2E or 60 percent of the State's total N2O emissions. It is estimated that approximately 3.5 MMTCO2E of N2O emissions from agricultural soil results from the application of organic and synthetic fertilizers.
There is uncertainty about how much N2O is emitted from agricultural soils under California specific conditions for the wide range of commodities and farming practices in the State. Current methods estimate that, on average, approximately 50 percent of the nitrogen fertilizer applied in the field is lost to the transport pathways of volatilization, leaching, and runoff.
Posted July 22, 2014