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Inactivation of Escherichia coli in Surface Water of Saturated Soil with the Pig Manure-based Liquid Fertilizers by Ultraviolet Radiation

자외선에 의한 가축분뇨 액비 시용 논 표면수 중 대장균 사멸율 변화

  • Kim, Min-Kyeong (Department of Agricultural Environment, National Academy of Agricultural Science, RDA) ;
  • Jung, Goo-Bok (Department of Agricultural Environment, National Academy of Agricultural Science, RDA) ;
  • Hong, Seung-Chang (Department of Agricultural Environment, National Academy of Agricultural Science, RDA) ;
  • Kang, Seong-Soo (Department of Agricultural Environment, National Academy of Agricultural Science, RDA) ;
  • Kwon, Soon-Ik (Department of Agricultural Environment, National Academy of Agricultural Science, RDA)
  • 김민경 (국립농업과학원 농업환경부) ;
  • 정구복 (국립농업과학원 농업환경부) ;
  • 홍성창 (국립농업과학원 농업환경부) ;
  • 강성수 (국립농업과학원 농업환경부) ;
  • 권순익 (국립농업과학원 농업환경부)
  • Received : 2011.05.18
  • Accepted : 2011.06.17
  • Published : 2011.06.30

Abstract

Liquid manure fertilizer drived from pig slurry is a valuable source of nutrients for crop production. However, there is no study for environmental assessment regarding microbial quality to apply liquid manure fertilizer. Therefore, this study aimed at quantifying the level of environmental impact on fecal coliform (Escherichia coli or E. coli ) survival in saturated soil such as paddy field. Surface water samples were collected up to 168 and 11 hours under natural sunlight and artificial ultraviolet radiation, respectively. The inactivation rate of E. coli under natural sunlight increased gradually after 48 hours. However, the inactivation rate of E. coli under artificial ultraviolet radiation increased linearly over time. Our findings suggested that the ultraviolet radiation is the limited factor on E. coli survival in surface water of saturated soil. This result will provide useful and practical guideline to applicators of agricultural soil in deciding appropriate handling and time frames for preventing pollution of water quality for sustainable agriculture.

Acknowledgement

Supported by : 국립농업과학원

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