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https://doi.org/10.5194/egusphere-2022-429
https://doi.org/10.5194/egusphere-2022-429
13 Jun 2022
 | 13 Jun 2022

Effects of mild alternate wetting and drying irrigation and rice straw application on N2O emissions in rice cultivation

Kaikuo Wu, Wentao Li, Zhanbo Wei, Zhi Dong, Yue Meng, Na Lv, and Lili Zhang

Abstract. The shortage of water resources and the decline in soil organic matter (SOM) are important limiting factors affecting the improvement of rice productivity, while alternate wetting and drying (AWD) irrigation and rice straw return are considered favorable mitigation measures. However, its impact on rice yield and greenhouse gas (GHG) emissions, especially nitrous oxide (N2O) emissions, needs to be further clarified, which is essential for the development of agronomic measures for water savings, soil fertilization and GHG reduction. Therefore, we explored the effects of mild AWD irrigation combined with rice straw return on N2O emissions and rice yield through rice pot experiments. This study showed that N2O emissions were mainly affected by urea application and irrigation methods, and urea application was the main reason. Compared with continuous flooding (CF) irrigation, mild AWD irrigation increased cumulative N2O emissions, with an average increase of 28.8 %. In addition, adding rice straw to mild AWD irrigation further stimulated N2O emissions. Compared with CF irrigation, mild AWD irrigation increased the yield-scaled N2O emissions, and the addition of rice straw further promoted the yield-scaled N2O emissions under mild AWD irrigation but reduced the global warming potential (GWP) by 62.9 %. Under the condition of urea application, compared with CF irrigation, mild AWD irrigation reduced nitrogen uptake by rice in the soil and rice aboveground biomass without reducing rice yield. Therefore, mild AWD irrigation combined with rice straw return is a promising agronomic measure to ensure rice yield, reduce the greenhouse effect and maintain or improve soil fertility.

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Journal article(s) based on this preprint

06 Oct 2022
Effects of mild alternate wetting and drying irrigation and rice straw application on N2O emissions in rice cultivation
Kaikuo Wu, Wentao Li, Zhanbo Wei, Zhi Dong, Yue Meng, Na Lv, and Lili Zhang
SOIL, 8, 645–654, https://doi.org/10.5194/soil-8-645-2022,https://doi.org/10.5194/soil-8-645-2022, 2022
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
We explored the effects of mild alternate wetting and drying (AWD) irrigation combined with rice...
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