Impact of the Rice-Duck Farming System on Regional Agricultural Environment at Hongsung Area

오리농법에 의한 벼 재배가 지역 환경에 미치는 영향 평가

  • Roh, Kee-An (Climate Change & Ecology Division, National Academy of Agricultural Science, RDA) ;
  • Kim, Min-Kyeong (Climate Change & Ecology Division, National Academy of Agricultural Science, RDA) ;
  • Ko, Byong-Gu (Climate Change & Ecology Division, National Academy of Agricultural Science, RDA) ;
  • Kim, Gun-Yeob (Climate Change & Ecology Division, National Academy of Agricultural Science, RDA) ;
  • Shim, Kyo-Moon (Climate Change & Ecology Division, National Academy of Agricultural Science, RDA) ;
  • Jeong, Hyun-Cheol (Climate Change & Ecology Division, National Academy of Agricultural Science, RDA) ;
  • Lee, Deog-Bae (Climate Change & Ecology Division, National Academy of Agricultural Science, RDA)
  • 노기안 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 김민경 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 고병구 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 김건엽 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 심교문 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • 이덕배 (농촌진흥청 국립농업과학원 기후변화생태과) ;
  • Received : 2009.06.12
  • Accepted : 2009.08.06
  • Published : 2009.12.28

Abstract

To clarify the impact of the rice-duck farming system on the regional environment and the surrounding, a case study was carried out at Hongdong Reservoir valley of Hongdong-myeon and Janggok-myeon, Hongseong-gun, Chungcheongnam-do where the density of livestock grazing is the highest and rice cultivation with the rice-duck farming system is extensively practiced. The soil characteristics and water qualities at paddy fields were compared between two rice cultivation methods of rice-duck farming system and conventional farming system. The organic matters and available phosphate contents in soil of paddy fields where the rice-duck farming system was practiced were higher than those of paddy fields where conventional farming system was practiced. However, the available phosphate content was lower than the optimum for rice cultivation and the mean concentration of paddy soil in Korea. The surface water quality of the paddy field with the rice-duck farming system was practiced had higher EC (137 %), $COD_{Cr}$ (220 %), T-N (172 %), and T-P (226 %) contents than that with the conventional farming system was practiced. Especially, $COD_{Cr}$ and T-P were more than 2 times higher, which tells that the possibility of water pollution by drainage water of paddy field is higher in the paddy fields with the rice-duck farming system practiced than in those with the conventional farming practiced. The higher contents of T-P and $COD_{Cr}$ in surface water at the paddy field of rice-duck farming system practiced were directly caused by soil particles in the muddy water. Consequently, it is necessary to thoroughly manage the irrigation and drainage system of rice-duck farming system practiced to prevent outflow of surface water from paddy and pollution of surrounding water system.

Keywords

Rice-duck farming system;Sustainable agriculture;Nitrogen;Water pollution;Rice paddy