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Table 5 Area- and yield-scaled greenhouse gas (GHG) emissions from synthetic N manufacture and fertilization for wheat and maize in different agricultural regions of China (2015–2017)

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

Agricultural regionArea-scaled GHG emissions (t CO2-eq ha−1)Yield-scaled GHG emissions (kg CO2-eq kg grain−1)
WheatMaizeWheatMaize
NEC1.78 ± 0.040.27 ± 0.01
NC2.10 ± 0.032.04 ± 0.070.35 ± 0.010.34 ± 0.02
MLYR2.60 ± 0.072.48 ± 0.100.50 ± 0.010.48 ± 0.02
NWC2.47 ± 0.033.26 ± 0.100.54 ± 0.010.56 ± 0.02
SSWC1.29 ± 0.062.37 ± 0.030.39 ± 0.020.47 ± 0.01
  1. Values in the table represent mean ± standard deviation
  2. NEC Northeast China, NC North China, MLYR Middle and lower reaches of Yangtze River, NWC Northwest China, SSWC South and Southwest China