Preprints
https://doi.org/10.5194/egusphere-2022-429
https://doi.org/10.5194/egusphere-2022-429
 
13 Jun 2022
13 Jun 2022
Status: this preprint is open for discussion.

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

Kaikuo Wu1,2, Wentao Li1,3, Zhanbo Wei1,2, Zhi Dong4,5, Yue Meng1,3, Na Lv1,3, and Lili Zhang1,2,6 Kaikuo Wu et al.
  • 1Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
  • 2Engineering Laboratory for Green Fertilizers, Chinese Academy of Sciences, Shenyang 110016, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
  • 4Institute of Tillage and Cultivation, Liaoning Academy of Agricultural Sciences, Shenyang 110161, China
  • 5Liaoning Key Laboratory of Conservation Tillage in Dry Land, Shenyang 110161, China
  • 6National Engineering Laboratory for Soil Nutrient Management, Shenyang 110016, China

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.

Kaikuo Wu et al.

Status: open (until 06 Aug 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-429', Anonymous Referee #1, 29 Jun 2022 reply

Kaikuo Wu et al.

Viewed

Total article views: 193 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
149 36 8 193 17 3 3
  • HTML: 149
  • PDF: 36
  • XML: 8
  • Total: 193
  • Supplement: 17
  • BibTeX: 3
  • EndNote: 3
Views and downloads (calculated since 13 Jun 2022)
Cumulative views and downloads (calculated since 13 Jun 2022)

Viewed (geographical distribution)

Total article views: 142 (including HTML, PDF, and XML) Thereof 142 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 02 Jul 2022
Download
Short summary
We explored the effects of mild alternate wetting and drying (AWD) irrigation combined with rice straw return on N2O emissions and rice yield through rice pot experiments. Mild AWD irrigation significantly increased N2O emissions and yield-scaled N2O emissions. The addition of rice straw under mild AWD irrigation could promote N2O emission. Mild AWD irrigation could reduce soil nitrogen uptake by rice when urea was applied. Mild AWD irrigation reduced rice aboveground biomass but not rice yield.