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Table 2 Estimated average annual greenhouse gas (GHG) emissions from synthetic N manufacture for wheat and maize in different provinces of China (2015–2017)

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

Agricultural region

Province

GHG emissions from synthetic N manufacture (Mt CO2-eq year−1)

Wheat

Maize

NEC

Liaoning

–

3.32 ± 0.09

Jilin

–

5.14 ± 0.10

Heilongjiang

–

7.94 ± 0.68

NC

Hebei

5.01 ± 0.12

4.23 ± 0.22

Shanxi

1.16 ± 0.12

2.65 ± 0.14

Shandong

6.65 ± 0.10

5.12 ± 0.29

Henan

8.74 ± 0.20

3.99 ± 0.06

Inner Mongolia

1.94 ± 0.19

6.35 ± 0.59

MLYR

Jiangsu

4.86 ± 0.38

1.02 ± 0.12

Anhui

4.14 ± 0.56

1.61 ± 0.20

Hubei

1.22 ± 0.01

1.19 ± 0.05

NWC

Shaanxi

2.03 ± 0.20

2.64 ± 0.17

Gansu

1.36 ± 0.07

2.64 ± 0.17

Xinjiang

2.98 ± 0.18

2.49 ± 0.12

SSWC

Chongqing

–

0.75 ± 0.04

Sichuan

0.86 ± 0.26

2.14 ± 0.34

Guizhou

–

1.62 ± 0.30

Yunnan

0.49 ± 0.09

3.84 ± 0.36

Guangxi

–

1.04 ± 0.06

  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