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Table 4 Estimated average annual greenhouse gas (GHG) emissions from synthetic N manufacture and fertilization for wheat and maize in China (2015–2017)

From: Greenhouse gas emissions from synthetic nitrogen manufacture and fertilization for main upland crops in China

 WheatMaize
GHG emissions from urea manufacture (Mt CO2-eq year−1)23.42 ± 0.1934.07 ± 1.00
GHG emissions from CF manufacture (Mt CO2-eq year−1)12.47 ± 0.7017.49 ± 2.34
GHG emissions from DAP manufacture (Mt CO2-eq year−1)4.03 ± 0.135.89 ± 0.34
GHG emissions from ABC manufacture (Mt CO2-eq year−1)1.53 ± 0.432.25 ± 0.12
Direct N2O emissions from the soil (Gg N2O year−1)35.82 ± 1.2069.44 ± 4.26
Total national GHG emissions (Mt CO2-eq year−1)52.11 ± 0.9380.40 ± 4.88
  1. Values in the table represent mean ± standard deviation
  2. CF compound fertilizers, DAP diammonium phosphate, ABC ammonium bicarbonate