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

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

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

Values in the table represent mean ± standard deviation
NEC Northeast China, NC North China, MLYR Middle and lower reaches of Yangtze River, NWC Northwest China, SSWC South and Southwest China

ISSN: 1750-0680