Urea Application Rate for Crop Straw Decomposition in Temperate China

Table 9

Enquiry table for urea applied to middle-late rice straw returning to field in all regions of China and provinces (cities, autonomous regions).

Regions		Average middle-late rice yield per unit from 2015 to 2017	Urea dosages of different C : N adjustment targets
			25 : 1	30 : 1	35 : 1
Northeast China	Liaoning	8589	210.30	154.39	114.37
	Jilin	8330	203.97	149.64	110.92
	Heilongjiang	7062	172.88	126.85	94.01
	Average	7444	182.20	133.72	99.20
Huang-Huai-Hai region of China	Beijing	6000	146.85	107.85	79.95
	Tianjin	8019	196.35	144.04	106.87
	Hebei	6614	161.83	118.78	88.04
	Shandong	8257	202.07	148.33	110.04
	Henan	8094	198.15	145.39	107.77
	Average	7973	195.13	143.27	106.26
The Middle-Lower Yangtze region of China	Shanghai	8468	207.28	152.12	112.86
	Jiangsu	8465	207.27	152.19	112.72
	Zhejiang	7321	179.27	131.57	97.51
	Anhui	6392	156.50	114.94	85.08
	Jiangxi	6285	153.90	112.95	83.70
	Hubei	8562	209.63	153.85	114.11
	Hunan	6705	164.10	120.45	89.25
	Average	7258	177.70	130.46	96.72
South China	Fujian	6200	151.77	111.39	82.57
	Guangdong	5615	137.37	100.89	74.77
	Guangxi	5584	136.75	100.27	74.45
	Hainan	4589	112.33	82.48	61.19
	Average	5671	138.77	101.87	75.61
Southwest China	Chongqing	7375	180.48	132.51	98.18
	Sichuan	7829	191.68	140.68	104.24
	Guizhou	6326	154.85	113.63	84.25
	Yunnan	5957	145.85	106.99	79.38
	Average	7086	173.40	127.31	94.43
Loess plateau region of China	Shanxi	6818	166.93	122.57	90.81
	Shaanxi	7531	184.37	135.32	100.36
	Gansu	6894	168.75	123.94	91.87
	Average	7503	183.67	134.90	99.94
Northwest arid region of China	Inner Mongolia	6731	164.75	120.98	89.65
	Ningxia	8356	204.47	150.17	111.31
	Xinjiang	9079	222.25	163.12	120.95
	Average	7903	193.45	142.01	105.27
Tibetan plateau region of China	Tibet	5556	136.05	99.86	74.03
	Qinghai	-	-	-	-
	Average	5556	136.05	99.86	74.03

Unit: kg/ha.