Southern China can produce more high-quality rice with less N by green manuring

Songjuan Gao, Guopeng Zhou, Danna Chang, Hao Liang, Jun Nie, Yulin Liao, Yanhong Lu, Changxu Xu, Jia Liu, Shang Han, Ji Wu, Hui Wang, Chuzeng Liu, Yuhu Lv, Yibin Huang, Chunmei He, Mingjian Geng, Jianhong Wang, Tieguang He, Zhongyi LiHai Liang, Shun Li, RM Rees, Kristian Thorup-Kristensen, Weidong Cao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Green manures (GMs) are commonly used in reducing synthetic fertilizer input and mitigating environmental burden in paddy fields in China, but the contributions and comprehensive mechanisms of GMs are not illustrated
clearly. We have established an experiment network of GM–rice rotation and have demonstrated extensively across eight provinces in southern China since 2008. Results from 201 site–year field experiments and the survey of GM’s responses at 71 demonstration sites and 2062 farmers were collected. Compared with conventional synthetic N (CN) fertilization without GM, GM with 60% CN achieved the same level of rice yield, total amino acid concentration increased by 62.64% in the grains, and CN use efficiency increased by 15.8%, whereas the C
footprint, reactive N loss, and N footprint decreased by 30.81%, 19.18%, and 9.65%, respectively. This quantitative analysis of green manuring provides support to rice production with low N input in southern China.
Original languageEnglish
Article number107025
JournalResources, Conservation and Recycling
Volume196
Early online date11 May 2023
DOIs
Publication statusPrint publication - Sept 2023

Keywords

  • green manure
  • Rice
  • Food security
  • Environmental sustainability
  • Green manure–rice rotation
  • Microbial mechanisms

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