Table 2 Global warming potential (GWP) and greenhouse gas intensity (GHGI) under different nitrogen rates for 2015–2016 summer maize and winter wheat growing seasons.

From: Crop production kept stable and sustainable with the decrease of nitrogen rate in North China Plain: An economic and environmental assessment over 8 years

Treatment

GWP (103 kg CO2-eqv ha−1)

GHGI (kg CO2-eqv kg−1)

Maize

Wheat

Annual

Maize

Wheat

Annual

N0

8.5 c

9.9 b

18.4 b

1.06 b

1.79 b

1.36 b

N1

10.5 b

9.7 b

20.2 b

0.96 c

1.42 c

1.14 c

N2

10.2 b

9.3 b

19.5 b

0.85 d

1.16 d

0.98 d

N3

14.2 a

15.9 a

30.1 a

1.20 a

1.93 a

1.50 a

  1. Nitrogen rates in wheat and maize, respectively, are; 0 and 0 kg N ha−1 (N0), 168 and 129 N ha−1 (N1), 240 and 185 kg N ha−1 (N2), and 300 and 300 kg N ha−1 (N3) in 2009–2016. Values followed by a different small letter within column are significantly different at P ≤ 0.05.
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