Significant reduction of ammonia emissions while increasing crop yields using the 4R nutrient stewardship in an intensive cropping system
ZHANG Chong, WANG Dan-dan, ZHAO Yong-jian, XIAO Yu-lin, CHEN Huan-xuan, LIU He-pu, FENG Li-yuan, YU Chang-hao, JU Xiao-tang
Significant reduction of ammonia emissions while increasing crop yields using the 4R nutrient stewardship in an intensive cropping system
Ammonia (NH3) emissions should be mitigated to improve environmental quality. Croplands are one of the largest NH3 sources, they must be managed properly to reduce their emissions while achieving the target yields. Herein, we report the NH3 emissions, crop yield and changes in soil fertility in a long-term trial with various fertilization regimes, to explore whether NH3 emissions can be significantly reduced using the 4R nutrient stewardship (4Rs), and its interaction with the organic amendments (i.e., manure and straw) in a wheat–maize rotation. Implementing the 4Rs significantly reduced NH3 emissions to 6 kg N ha–1 yr–1 and the emission factor to 1.72%, without compromising grain yield (12.37 Mg ha–1 yr–1) and soil fertility (soil organic carbon of 7.58 g kg–1) compared to the conventional chemical N management. When using the 4R plus manure, NH3 emissions (7 kg N ha–1 yr–1) and the emission factor (1.74%) were as low as 4Rs, and grain yield and soil organic carbon increased to 14.79 Mg ha–1 yr–1 and 10.09 g kg–1, respectively. Partial manure substitution not only significantly reduced NH3 emissions but also increased crop yields and improved soil fertility, compared to conventional chemical N management. Straw return exerted a minor effect on NH3 emissions. These results highlight that 4R plus manure, which couples nitrogen and carbon management can help achieve both high yields and low environmental costs.
ammonia emission / crop yield / 4R nutrient stewardship / partial manure substitution / winter wheat-summer maize cropping system {{custom_keyword}} /
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This work was supported by the Hainan Key Research and Development Project, China (ZDYF2021XDNY184), the Hainan Provincial Natural Science Foundation of China (422RC597), the National Natural Science Foundation of China (41830751), the Hainan Major Science and Technology Program, China (ZDKJ2021008), and the Hainan University Startup Fund, China (KYQD(ZR)-20098).
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