Degradation of the herbicide dicamba under sunlight and in soil

제초제 Dicamba의 자연광 및 토양 중 분해

  • Oh, Kyeong-Seok (National Institute of Agricultural Science & Technology, RDA) ;
  • Oh, Byung-Youl (National Institute of Agricultural Science & Technology, RDA) ;
  • Park, Seung-Soon (National Institute of Agricultural Science & Technology, RDA) ;
  • Ihm, Yang-Bin (National Institute of Agricultural Science & Technology, RDA) ;
  • Kyung, Kee-Sung (National Institute of Agricultural Science & Technology, RDA) ;
  • Lee, Jae-Koo (Department of Agricultural Chemistry, College of Agriculture, Chungbuk National University)
  • 오경석 (농업과학기술원 작물보호부 농약안전성과) ;
  • 오병렬 (농업과학기술원 작물보호부 농약안전성과) ;
  • 박승순 (농업과학기술원 작물보호부 농약안전성과) ;
  • 임양빈 (농업과학기술원 작물보호부 농약안전성과) ;
  • 경기성 (농업과학기술원 작물보호부 농약안전성과) ;
  • 이재구 (충북대학교 농과대학 농화학과)
  • Published : 2000.09.30

Abstract

In order to elucidate the degradation of the herbicide dicamba, the degradabilities of dicamba under sunlight and in soils were investigated. The photodegradation rate of the authentic dicamba under sunlight condition was only 3.3% after 9 weeks. 4-Hydroxy dicamba turned out to be the major product, and 5-hydroxy dicamba was also identified. Dicamba was degraded to 3,6-dichlorosalicylic acid by demethylation in the viable soil, which resulted in 14.7 to 23.2% degradation of the applied amount during 8 weeks of incubation. Meanwhile, the degradation was quite slow in the sterilize soil, which revealed that the soil microbes played a major role in dicamba degradation.