Scientia Agricultura Sinica ›› 2021, Vol. 54 ›› Issue (1): 95-109.doi: 10.3864/j.issn.0578-1752.2021.01.008

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Nutrient Resource Quantity of Main Crop Straw and Utilization Potential Under Straw Returning in Anhui Province

CHAI RuShan(),XU Yue,CHENG QiPeng,WANG QingYun,MA Chao,YE XinXin,ZHANG LiGan,GAO HongJian()   

  1. School of Resources and Environment, Anhui Agricultural University/Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/Research Centre of Phosphorous Efficient Utilization and Water Environment Protection Along the Yangtze River Economic Belt, Hefei 230036
  • Received:2020-04-07 Accepted:2020-06-09 Online:2021-01-01 Published:2021-01-13
  • Contact: HongJian GAO E-mail:rschai@ahau.edu.cn;hjgao@ahau.edu.cn

Abstract:

【Objective】 Anhui is a national major grain production province. Clearance of the nutrient resource quantity of main crop straw and utilization potential under straw returning in Anhui province could provide reference data for reasonable utilization of straw nutrient resources and synthetic fertilizers reduction. 【Method】 Based on statistical data and literature review, the capacity of main crop straw, the nutrient resource quantity of straw and potential for straw incorporation to substitute nutrient inputs were estimated for different cities and regions of Anhui province in this research. 【Result】 The amounts of crop straw from rice, wheat, maize and rapeseed were 17.58, 22.51, 7.12 and 2.75 million tons per year in Anhui province during the period of 2016-2018, respectively. The crop straws were mainly produced in North area of Huai River, and Area between Yangtze River and Huai River, accounting for 47.0% and 33.6% of the total provincial crop straw yields, respectively. The main crop straws contained 0.40 million tons of N, 0.13 million tons of P2O5 and 0.85 million tons of K2O, respectively. The straw nutrient resources from rice, wheat, maize and rapeseed accounted for 44.6%, 34.4%, 13.9% and 7.1% of the total provincial main crop straw nutrient resources, respectively. In the main crop-cultivating areas of Anhui province, the amounts of synthetic fertilizers substituted by rice straw incorporation per unit area of arable land were N 29.5-35.0 kg·hm-2, P2O5 13.6-16.2 kg·hm-2 and K2O 132.9-157.5 kg·hm-2. The amounts of synthetic fertilizers substituted by wheat straw incorporation were N 24.1-33.5 kg·hm-2, P2O5 8.4-11.7 kg·hm-2 and K2O 83.5-115.8 kg·hm-2. For maize, straw incorporation could substitute N 24.7-32.7 kg·hm-2, P2O5 12.5-16.5 kg·hm-2 and K2O 59.7-79.0 kg·hm-2. In the main rapeseed-planting areas, rapeseed straw incorporation could substitute N 24.1-34.0 kg·hm-2, P2O5 11.2-15.8 kg·hm-2 and K2O 101.3-142.7 kg·hm-2. 【Conclusion】 Using crop straws properly could satisfy the basic potassium requirement for crop production and partly substitute the inputs of synthetic nitrogen and phosphorus fertilizers. Making full use of nutrient resources from main crop straws may provide an effective solution for synthetic fertilizers reduction under straw returning in Anhui province.

Key words: Anhui province, crop straw, nutrient resource quantity, straw incorporation, synthetic fertilizers substitution

Table 1

Straw/grain ratio of different crops, nutrient contents in straws and in-season nutrient release rates of returned straws"

作物
Crop
草谷比[17]
Straw/grain ratio
秸秆养分含量[23]
Nutrient content (g·kg-1)
秸秆养分当季释放率[17]
In-season nutrient release rate (%)
N P K N P K
水稻Rice 1.08 9.1 1.3 18.9 47.19 66.69 84.91
小麦Wheat 1.39 6.5 0.8 10.5 50.11 62.01 89.05
玉米Maize 1.29 9.2 1.5 11.8 54.04 73.03 84.43
油菜Rapeseed 2.64 8.7 1.4 19.4 52.65 66.31 82.18

Fig. 1

Annual average yields of main crop straws in different cities of Anhui province during the period of 2016-2018"

Fig. 2

Annual average yields of main crop straws in different regions of Anhui province during the period of 2016-2018 NH: North area of Huai River; YH: Area between Yangtze River and Huai River; EY: Edge area of Yangtze River; SY: South area of Yangtze River"

Fig. 3

Annual average yields of main crop straw nutrient resources in different cities of Anhui province during the period of 2016-2018"

Table 2

Annual average yields of main crop straw nutrient resources in different regions of Anhui province during the period of 2016-2018"

区域
Region
作物
Crop
秸秆养分量Straw nutrient quantity (×103 t)
N P2O5 K2O
淮北
North area of Huai River
水稻Rice 12.06±0.70 3.95±0.23 30.19±1.74
小麦Wheat 102.47±2.72 28.88±0.77 199.48±5.30
玉米Maize 57.67±5.83 21.54±2.18 89.15±9.01
油菜Rapeseed 1.08±0.09 0.40±0.03 2.90±0.24
江淮
Area between Yangtze
River and Huai River
水稻Rice 88.34±6.20 28.90±2.03 221.11±15.53
小麦Wheat 36.41±0.66 10.26±0.18 70.88±1.28
玉米Maize 4.84±1.06 1.81±0.39 7.48±1.63
油菜Rapeseed 8.40±2.90 3.10±1.07 22.59±7.79
沿江
Edge area of Yangtze River
水稻Rice 41.54±0.79 13.59±0.26 103.98±1.97
小麦Wheat 5.32±0.72 1.50±0.20 10.35±1.39
玉米Maize 1.60±0.15 0.60±0.06 2.48±0.23
油菜Rapeseed 10.31±0.59 3.80±0.22 27.72±1.57
江南
South area of Yangtze River
水稻Rice 18.04±0.26 5.90±0.09 45.16±0.66
小麦Wheat 2.15±0.20 0.61±0.06 4.18±0.38
玉米Maize 1.37±0.14 0.51±0.05 2.11±0.22
油菜Rapeseed 4.09±0.42 1.51±0.15 11.00±1.13

Table 3

Synthetic fertilizers substitute potential through main crop straw incorporation in different cities of Anhui province during the period of 2016-2018 (kg·hm-2)"

区域
Region

City
水稻秸秆Rice straw 小麦秸秆Wheat straw 玉米秸秆Maize straw 油菜秸秆Rapeseed straw
N P2O5 K2O N P2O5 K2O N P2O5 K2O N P2O5 K2O
淮北
North area of
Huai River
阜阳市Fuyang 29.5 13.6 132.9 30.2 10.5 104.5 32.2 16.2 77.7 30.2 14.0 126.7
亳州市Bozhou 28.3 13.1 127.6 33.5 11.7 115.8 32.7 16.5 79.0 34.7 16.1 145.5
淮北市Huaibei 33.5 11.7 116.0 24.7 12.5 59.7 27.8 12.9 116.4
宿州市Suzhou 33.7 15.6 151.9 28.5 9.9 98.6 27.5 13.9 66.3 24.7 11.4 103.5
蚌埠市Bengbu 29.8 13.8 134.1 27.7 9.7 95.7 31.7 16.0 76.6 21.2 9.8 88.9
江淮
Area between Yangtze River
and Huai River
六安市Luan 30.7 14.2 138.4 22.1 7.7 76.5 29.1 14.7 70.2 24.1 11.2 101.3
淮南市Huainan 35.0 16.2 157.5 25.5 8.9 88.3 30.7 15.5 74.0 32.5 15.1 136.4
合肥市Hefei 31.7 14.7 143.0 19.7 6.9 68.0 29.7 15.0 71.6 33.0 15.3 138.3
滁州市Chuzhou 29.9 13.8 134.5 24.1 8.4 83.5 29.5 14.9 71.3 31.0 14.4 130.1
沿江
Edge area of Yangtze River
安庆市Anqing 30.0 13.9 135.0 14.3 5.0 49.6 28.6 14.4 69.1 26.7 12.4 112.2
铜陵市Tongling 26.8 12.4 120.9 15.3 5.3 53.0 30.6 15.4 73.8 26.9 12.5 112.8
芜湖市Wuhu 32.8 15.2 147.7 20.6 7.2 71.2 34.5 17.4 83.3 34.0 15.8 142.7
马鞍山市Maanshan 34.1 15.8 153.4 22.2 7.8 76.9 36.2 18.3 87.5 32.1 14.9 134.5
江南
South area of Yangtze River
池州市Chizhou 28.3 13.1 127.3 14.3 5.0 49.5 31.7 16.0 76.5 28.2 13.1 118.3
宣城市Xuancheng 29.5 13.6 132.9 20.7 7.2 71.6 38.9 19.6 93.9 28.3 13.2 118.9
黄山市Huangshan 33.0 15.2 148.5 23.1 11.7 55.8 18.1 8.4 76.0

Table 4

Synthetic fertilizers substitute potential through main crop straw incorporation in different regions of Anhui province during the period of 2016-2018"

区域
Region
种植制度
Cropping system
作物季型
Crop season
上季作物秸秆还田化肥可替代量
Synthetic fertilizers substitute potential (kg·hm-2)
N P2O5 K2O
淮北North area of Huai River 小麦-玉米
Wheat-maize
小麦季Wheat 30.3±3.3 15.3±1.6 73.1±7.9
玉米季Maize 30.5±2.3 10.6±0.8 105.5±8.0
江淮Area between Yangtze River and Huai River 水稻-小麦
Rice-wheat
水稻季Rice 23.4±1.7 8.2±0.6 81.1±5.9
小麦季Wheat 31.5±0.7 14.6±0.3 141.7±3.2
水稻-油菜
Rice-rapeseed
水稻季Rice 29.4±0.4 13.7±0.2 123.4±1.9
油菜季Rapeseed 31.5±0.7 14.6±0.3 141.7±3.2
沿江Edge area of Yangtze River 水稻-油菜
Rice-rapeseed
水稻季Rice 28.8±0.4 13.4±0.2 120.9±1.7
油菜季Rapeseed 32.5±0.9 15.0±0.4 146.3±4.2
双季稻
Double cropping rice
早稻季Early rice 27.7±3.2 12.8±1.5 124.6±14.6
晚稻季Late rice 26.7±2.2 12.3±1.0 120.2±10.0
江南South area of Yangtze River 水稻-油菜
Rice-rapeseed
水稻季Rice 25.6±0.8 11.9±0.4 107.3±3.4
油菜季Rapeseed 30.2±0.5 14.0±0.2 135.9±2.1
双季稻
Double cropping rice
早稻季Early rice 27.2±1.4 12.6±0.6 122.3±6.2
晚稻季Late rice 27.1±1.9 12.5±0.9 122.2±8.4
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