Effect of Chinese milk vetch (Astragalus sinicus L.) as a green manure on rice productivity and methane emission in paddy soil

Chang Hoon Lee, Ki Do Park, Ki Yuol Jung, Muhammad Aslam Ali, Dokyoung Lee, Jessie Gutierrez, Pil Joo Kim

Research output: Contribution to journalArticle

Abstract

This field study was undertaken to investigate the optimum recycling rate of the above ground biomass of Chinese milk vetch (Astragalus sinicus L. hereafter, vetch) to improve rice productivity and decrease seasonal methane (CH4) flux in mono-rice cultivation system. The above ground part of vetch was applied in paddy field at rates 0, 10, 20 and 40Mgha-1 on fresh weight basis to investigate its effect on rice (Oryza sativa) productivity and CH4 emission flux and was compared with the typical standard NPK chemical fertilization (N-P2O5-K2O=90-45-58kgha-1). Rice productivity increased significantly with increasing vetch application, and more interestingly, similar grain yield was obtained between vetch application at 10Mgha-1 as green manure and NPK fertilization. Methane emission rates, which were measured by closed-chamber method, increased significantly (p<0.05) with increasing application levels of vetch, and seasonal CH4 fluxes exceeded to that in NPK fertilization at over 10Mgha-1 vetch application. Our findings revealed that 10Mgha-1 vetch application as green manure amendment can be an effective application level of sustaining rice productivity without increasing CH4 emission compared to NPK fertilization in Korean mono-rice cultivation systems.

Original languageEnglish (US)
Pages (from-to)343-347
Number of pages5
JournalAgriculture, Ecosystems and Environment
Volume138
Issue number3-4
DOIs
StatePublished - Aug 1 2010

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Keywords

  • Chinese milk vetch (Astragalus sinicus L.)
  • Green manure
  • Methane
  • Paddy soil
  • Rice

ASJC Scopus subject areas

  • Ecology
  • Animal Science and Zoology
  • Agronomy and Crop Science

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