Influence of soil organic matter and moisture on the persistence of the herbicide mefenacet in soils

제초제 Mefenacet의 토양 중 분해에 미치는 토양유기물과 토양수분에 의한 영향

  • Kim, Sung-Min (Research center, CropScience Korea Ltd.) ;
  • Cho, Il-Kyu (Research center, CropScience Korea Ltd.) ;
  • Kyung, Kee-Sung (Department of Pesticide Safety, National Institute of Agricultural Science & Technology) ;
  • Lee, Jae-Koo (Department of Agricultural Chemistry, Chungbuk National University)
  • 김성민 (크롭사이언스 코리아(주) 기술연구소) ;
  • 조일규 (크롭사이언스 코리아(주) 기술연구소) ;
  • 경기성 (농업과학기술원 농약안전성과) ;
  • 이재구 (충북대학교 농과대학 농화학과)
  • Published : 2003.09.30

Abstract

In order to elucidate a degradation characteristics of herbicide mefenacet in soil, the persistence in soils was studied under laboratory conditions for $90\sim120$ days at $28^{\circ}C$. Mefenacet residues were determined from the two soils which pre-treated by sterilization and flooding, respectively. Non-sterilized upland soil was used as a control. When 70 days elapsed from application time, $55\sim63%$ of mefenacet applied were dissipated in control soils. However, $32\sim33%$ of mefenacet applied were dissipated in the sterilized soils and $33\sim35%$ was dissipated in the flooded soils. 까 lese results indicated that the degradation of mefenacet was assumed to be due to microorganism, especially aerobic microbes. In order to elucidate the influence of water content on the persistence of mefenacet in soil, water content in soils was adjusted to 20, 50, and 80% of the water-holding capacity(Field capacity, WHC). The half-life of mefenacet in soil containing 20% and 50% of WHC were 82 and 73 days, respectively, after incubation for 90 days. However, the half-life in soil containing 80% of WHC was shortened to 61 days. These results indicated that degradation of mefenacet in soil was influenced by the activity of soil microorganism, organic matter content and water content.

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