Urea Application Rate for Crop Straw Decomposition in Temperate China

Table 5

Enquiry table for urea applied to wheat straw returning to the field in all regions of China and provinces (cities, autonomous regions).

Regions		Average wheat yield per unit from 2015 to 2017	Urea dosages of different C : N adjustment targets
			25 : 1	30 : 1	35 : 1
Northeast China	Liaoning	4215	154.40	118.20	92.39
	Jilin	4286	156.73	120.26	94.04
	Heilongjiang	3519	128.78	98.68	77.12
	Average	3553	130.02	99.64	77.86
Huang-Huai-Hai region of China	Beijing	5375	196.83	150.74	117.86
	Tianjin	5567	203.77	156.21	122.14
	Hebei	6240	228.45	175.05	136.80
	Shandong	6135	224.55	172.05	134.55
	Henan	6426	235.27	180.32	140.98
	Average	6285	230.10	176.25	137.85
The Middle-Lower Yangtze region of China	Shanghai	4241	155.30	119.02	93.03
	Jiangsu	5286	193.47	148.25	115.90
	Zhejiang	3777	138.24	105.99	82.86
	Anhui	5744	210.26	161.07	125.98
	Jiangxi	2117	77.52	59.34	46.37
	Hubei	3804	139.28	106.63	83.42
	Hunan	3230	118.28	90.62	70.88
	Average	5176	189.49	145.23	113.57
South China	Fujian	3200	117.13	89.79	70.21
	Guangdong	3043	111.38	85.29	66.71
	Guangxi	1667	60.98	46.79	36.56
	Hainan	-	-	-	-
	Average	2099	76.86	58.83	45.97
Southwest China	Chongqing	3281	120.10	91.96	71.94
	Sichuan	3818	139.79	107.02	83.73
	Guizhou	2521	92.29	70.68	55.22
	Yunnan	2104	77.10	59.06	46.14
	Average	3179	116.41	89.10	69.70
Loess plateau region of China	Shanxi	4073	149.09	114.22	89.28
	Shaanxi	4185	153.15	117.45	91.80
	Gansu	3522	128.89	98.77	77.18
	Average	3940	144.27	110.56	86.44
Northwest arid region of China	Inner Mongolia	2821	103.24	79.08	61.82
	Ningxia	3180	116.40	89.25	69.75
	Xinjiang	5563	203.63	156.09	122.06
	Average	4525	165.67	126.97	99.28
Tibetan plateau region of China	Tibet	6108	223.56	171.35	134.05
	Qinghai	3818	139.79	107.02	83.73
	Average	4445	162.68	124.67	97.43

Unit: kg/ha.