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| Analysis of nitrogen balance and potential pollution of main crops in the Hetao Irrigation area of Inner Mongolia |
| Received:December 01, 2022 Revised:April 18, 2023 |
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| KeyWord:soil nitrogen residues;nitrogen balance;pollution risk;Hetao Irrigation area |
| Author Name | Affiliation | E-mail | | ZHAO Bayinnamula | College of Grassland and Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010018, China
Inner Mongolia Autonomous Region Key Laboratory of Soil Quality and Nutrient Resources, Hohhot 010018, China
Key Laboratory of Agricultural Ecological Security and Green Development in Inner Mongolia Autonomous Region Higher Education, Hohhot 010018, China | | | LU Zhanyuan | Inner Mongolia Academy of Agricultural Sciences, Hohhot 010031, China | | | LI Fei | College of Grassland and Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010018, China
Inner Mongolia Autonomous Region Key Laboratory of Soil Quality and Nutrient Resources, Hohhot 010018, China
Key Laboratory of Agricultural Ecological Security and Green Development in Inner Mongolia Autonomous Region Higher Education, Hohhot 010018, China | lifei@imau.edu.cn | | HONG Mei | College of Grassland and Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010018, China
Inner Mongolia Autonomous Region Key Laboratory of Soil Quality and Nutrient Resources, Hohhot 010018, China
Key Laboratory of Agricultural Ecological Security and Green Development in Inner Mongolia Autonomous Region Higher Education, Hohhot 010018, China | | | YANG Haibo | College of Grassland and Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010018, China
Inner Mongolia Autonomous Region Key Laboratory of Soil Quality and Nutrient Resources, Hohhot 010018, China
Key Laboratory of Agricultural Ecological Security and Green Development in Inner Mongolia Autonomous Region Higher Education, Hohhot 010018, China | | | DE Haishan | College of Grassland and Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010018, China
Inner Mongolia Autonomous Region Key Laboratory of Soil Quality and Nutrient Resources, Hohhot 010018, China
Key Laboratory of Agricultural Ecological Security and Green Development in Inner Mongolia Autonomous Region Higher Education, Hohhot 010018, China | | | BAO Mingzhe | College of Grassland and Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010018, China
Inner Mongolia Autonomous Region Key Laboratory of Soil Quality and Nutrient Resources, Hohhot 010018, China
Key Laboratory of Agricultural Ecological Security and Green Development in Inner Mongolia Autonomous Region Higher Education, Hohhot 010018, China | |
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| Abstract: |
| The potential nitrogen pollution risk in the Hetao Irrigation area was studied from the perspective of nitrogen balance to provide a scientific basis for farmland nitrogen management in this area. Soil nitrogen balance is an important parameter to evaluate nitrogen use efficiency and environmental risk in farmlands. In this paper, maize and sunflower were selected as the main crops in the Hetao Irrigation area. The status of soil inorganic nitrogen residues during harvest under the traditional planting mode was investigated. The environmental pollution risk in maize and sunflower fields was analyzed through the potential loss of surplus nitrogen from the perspective of nitrogen balance. The residual inorganic nitrogen in a farmland in the Hetao Irrigation area increased with increasing nitrogen application rate. The average residual inorganic nitrogen at a depth of 0~90 cm in maize and sunflower fields was 66.11 kg·hm-2 and 45.53 kg·hm-2, respectively. The maize field, located in the central Wuyuan County, had a residual inorganic nitrogen amount of 336.93 kg·hm-2, while the sunflower fields located in the east of Ulate south Banner, had the highest residual amount of 273.66 kg·hm-2. The annual input of nitrogen in maize and sunflower fields was 514.81 kg·hm-2 and 314.73 kg·hm-2, respectively. Fertilizer nitrogen was the main nitrogen input, accounting for more than 85% of total nitrogen input. Nitrogen output was mainly absorbed and assimilated by crops. The average annual nitrogen output of maize and sunflower fields were 362.10 kg·hm-2 and 209.65 kg·hm-2, respectively. The annual nitrogen surplus values of 235.71 kg·hm-2 and 168.08 kg·hm-2, respectively, were accompanied by a substantial amount of potential nitrogen loss 169.60 kg·hm-2 and 122.55 kg·hm-2, respectively. According to the comprehensive analysis of nitrogen balance, the recommended nitrogen fertilizer amount for maize and sunflower to maintain the current yield level in Hetao irrigation area of Inner Mongolia is about 280 kg·hm-2 and 150 kg·hm-2, respectively. Compared with the current nitrogen fertilizer input of maize and sunflower in Hetao irrigation area, this fertilizer application rate can save 198 kg·hm-2 and 128 kg·hm-2, respectively.This also can significantly reduce the potential loss of nitrogen and reduce environmental pressure. |
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