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| Effects of different nitrogen regimes on greenhouse gas emissions and grain yields in paddy fields |
| Received:October 29, 2019 |
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| KeyWord:paddy field;greenhouse gas;real-time nitrogen management;precise and quantitative nitrogen application;one-off fertilization |
| Author Name | Affiliation | E-mail | | ZHANG Zhi-sheng | Food Crops Institute, Hubei Academy of Agricultural Sciences/Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Wuhan 430064, China | | | WANG Ben-fu | Food Crops Institute, Hubei Academy of Agricultural Sciences/Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Wuhan 430064, China | | | LI Yang | Food Crops Institute, Hubei Academy of Agricultural Sciences/Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Wuhan 430064, China | | | YANG Xiao-long | Food Crops Institute, Hubei Academy of Agricultural Sciences/Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Wuhan 430064, China | | | HU Yang | Food Crops Institute, Hubei Academy of Agricultural Sciences/Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Wuhan 430064, China
Yangtze University/Hubei Collaborative Innovation Center for Grain Industry, Jingzhou 434023, China | | | WANG Ling-fei | Yangtze University/Hubei Collaborative Innovation Center for Grain Industry, Jingzhou 434023, China | | | CHENG Jian-ping | Food Crops Institute, Hubei Academy of Agricultural Sciences/Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Wuhan 430064, China
Yangtze University/Hubei Collaborative Innovation Center for Grain Industry, Jingzhou 434023, China | chjp609@163.com |
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| Abstract: |
| To explore the impacts of different N regimes on greenhouse gas emissions and rice grain yield, a field experiment was conducted to examine the greenhouse gas emissions and rice grain yield under no N fertilizer input(CK), local farmer fertilization practice(FFP), real-time N management(RTNM), precise and quantitative N application(PQNA), and one-off fertilization(OOF)in paddy fields of Sanhu Farm, Jiangling City. The results showed that FFP, PQNA, RTNM, and OOF significantly increased the CH4 and N2O emissions compared with CK. There were no significant differences in CH4 emissions between FFP, PQNA, and RTNM. Moreover, compared with FFP, OOF decreased CH4 emissions by 27.5%, while RTNM and OOF decreased N2O emissions by 23.1% and 25.0%, respectively. Rice grain yield showed few differences between FFP and OOF. RTNM and PQNA significantly increased the rice grain yield compared with FFP. The lowest global warming potential(GWP)was provided by OOF, which was 27.4%, 12.5%, and 18.5% lower than that of FFP, RTNM, and PQNA, respectively. The greenhouse gas emission intensity of PQNA, RTNM, and OOF was 22.2%, 24.4%, and 26.7% lower than that of FFP, respectively. This study shows that the use of optimized N fertilizer management practices such as PQNA, RTNM, and OOF can not only reduce greenhouse gas emissions from paddy fields, but also ensure rice grain yield, thereby achieving the goals of high yield, high efficiency, and environmental friendliness. OOF has the lowest GWP and lowest topdressing rate without decreasing the rice grain yield, and can be widely used in the Jianghan Plain. |
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