Assessment of Soil and Water Quality in some Catchments of Different Agricultural Practices in Nakdong River Basin

낙동강 유역 농업지대에서 영농형태별 토양과 수질 평가

  • Kim, Min-Kyeong (Dept. of Environment and Ecology, Division of Agricultural Environment, National Institute of Agricultural Science and Technology) ;
  • Seo, Myung-Chul (Agro-Multifunctional Assessment Research Team, National Institute ofAgricultural Science and Technology) ;
  • Lee, Nam-Jong (Dept. of Environment and Ecology, Division of Agricultural Environment, National Institute of Agricultural Science and Technology) ;
  • Chung, Jong-Bae (Department ofAgricultural Chemistry, Daegu University) ;
  • Kim, Bok-Jin (School of Biological Resources, Yeungnam University)
  • 김민경 (농업과학기술원 환경생태과) ;
  • 서명철 (농업과학기술원 농업의 다원적 기능 평가팀) ;
  • 이남종 (농업과학기술원 환경생태과) ;
  • 정종배 (대구대학교 생명환경학부) ;
  • 김복진 (영남대학교 생물자원학부)
  • Received : 2003.01.16
  • Accepted : 2003.02.06
  • Published : 2003.02.28


Soil and water quality was monitored in the Nakdong River basin to assess the impact of different agricultural practices. From five catchments, soil samples were collected at three times during 1996 to 1998, and water samples were collected at twelve times on July during 1995 to 1999. The major agricultural practices were paddy and upland farming in three areas surveyed: Youngju, Goryung, and Milyang. Apple orchards were located along in the Imgo-Cheon catchment. Intensive vegetable farming in plastic fIlm house was practiced in the Habin-Cheon catchment. Total N contents, 0.04-0.32%, of paddy soils were low in comparison with those of upland, orchard, and plastic film house soils. Available phosphate($P_2O_5$) contents, $2-421mg\;kg^{-1}$, in plastic film house soils were higher than those in paddy soils. In plastic film house and upland soils, CEC of soils were high. The N concentrations in most of the streams were higher than $1.0mg^{-1}$, the standard of agricultural irrigation water. The P concentrations were above $1.0mg^{-1}$, the standard of agricultural irrigation water and were higher than the minimum level for eutrophication, $0.01-0.05mg\;L^{-1}$ in most of the streams. In conclusion, nutrients by agricultural activity could affect water quality of streams near the agricultural fields. Good water quality in streams can be maintained by proper management of agricultural fields and by decreasing application amount of fertilizers in agricultural fields.


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