Urea Application Rate for Crop Straw Decomposition in Temperate China

Table 11

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

Regions		Average corn yield per unit from 2015 to 2017	Urea dosages of different C : N adjustment targets
			25 : 1	30 : 1	35 : 1
Northeast China	Liaoning	6334	125.48	85.85	57.64
	Jilin	7654	151.58	103.70	69.64
	Heilongjiang	6128	121.36	83.01	55.74
	Average	6657	131.79	90.26	60.57
Huang-Huai-Hai region of China	Beijing	6574	130.13	89.10	59.75
	Tianjin	5433	107.61	73.69	49.38
	Hebei	5470	108.35	74.18	49.75
	Shandong	6523	129.11	88.47	59.23
	Henan	5401	106.97	73.16	49.07
	Average	5799	114.78	78.52	52.75
The Middle-Lower Yangtze region of China	Shanghai	6635	131.35	89.92	60.35
	Jiangsu	5568	110.17	75.53	50.60
	Zhejiang	4437	87.84	60.16	40.31
	Anhui	5367	106.29	72.71	48.72
	Jiangxi	4281	84.72	57.98	38.90
	Hubei	4592	90.94	62.22	41.73
	Hunan	5421	107.37	73.43	49.25
	Average	5170	102.35	70.13	47.05
South China	Fujian	4201	83.12	56.86	38.26
	Guangdong	4434	87.78	60.07	40.30
	Guangxi	4558	90.26	61.77	41.38
	Hainan	-	-	-	-
	Average	4519	89.48	61.25	41.14
Southwest China	Chongqing	5577	110.49	75.56	50.67
	Sichuan	5635	111.50	76.34	51.24
	Guizhou	4346	86.02	58.95	39.55
	Yunnan	5039	99.73	68.24	45.74
	Average	5167	102.29	70.09	47.03
Loess plateau region of China	Shanxi	5349	105.93	72.42	48.68
	Shaanxi	4689	92.88	63.57	42.68
	Gansu	5610	111.00	76.05	51.00
	Average	5215	103.25	70.73	47.35
Northwest arid region of China	Inner Mongolia	6667	131.99	90.39	60.66
	Ningxia	7189	142.30	97.39	65.37
	Xinjiang	7457	147.64	101.13	67.82
	Average	6859	135.83	93.00	62.30
Tibetan plateau region of China	Tibet	4685	92.78	63.48	42.58
	Qinghai	6677	132.20	90.52	60.65
	Average	6324	125.14	85.76	57.42

Unit: kg/ha.