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| Rational nitrogen application is the key to mitigate agricultural nitrous oxide emission |
| Received:March 05, 2020 |
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| KeyWord:rational N fertilization;N2O emission;N rate;N fertilizer type;fertilization time and place |
| Author Name | Affiliation | E-mail | | LI Yue | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | JU Xiao-tang | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | juxt@cau.edu.cn |
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| Abstract: |
| Agriculture is the largest anthropogenic source of nitrous oxide(N2O), accounting for two-thirds of the total anthropogenic emissions, which is a consequence of using synthetic nitrogen(N)fertilizer and animal manure. Rational N fertilization is the key to get higher target yield, maintain soil N fertility and reduce the environmental pollution caused by N fertilization. It also plays an important role in reducing cropland N2O emissions and global warming. Based on the "4R" concept or technology(Right amount, Right type, Right time and Right place)of rational fertilization, we discuss the quantitative relationships between N rate and N2O emission, also the influence of fertilizer types, fertilization time and place on reducing N2O emission in this paper. We emphasize that there will be an exponential increase in N2O emission as the N rate exceeded crop demand and the importance of controlling the N rates within the rational N fertilization range for reducing N2O emission. Long-term systematic studies on yield, quality, ammonia(NH3) volatilization, N leaching, N2O emission and soil fertility need to be carried out under different soil-climate-crop systems to develop a standardized cropping system and rational fertilization management that could be mechanizing operation in similar areas, including the coordination with other agronomic practices, such as crop rotation and tillage, irrigation, organic manure and straw return, and management of phosphorus and potash fertilizer, medium and trace elements, which aims to achieve the goal of sustainable intensive crop production for considering yield, quality, economics and environmental effects. |
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