Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Management Strategies to Conserve Soil and Water Qualities in the Sloping Uplands in Korea

한국의 경사지 밭의 토양 및 물의 보전 관리 전략

  • Yang, Jae-E. (Div. of Biological Environment, Kangwon National University) ;
  • Ryu, Jin-Hee (National Institute of Crop Science, RDA) ;
  • Kim, Si-Joo (National Institute of Crop Science, RDA) ;
  • Chung, Doug-Young (Department of Agricultural Chemistry, Chungnam National University)
  • 양재이 (강원대학교 생물환경학과) ;
  • 유진희 (농촌진흥청 국립식량과학원) ;
  • 김시주 (농촌진흥청 국립식량과학원) ;
  • 정덕영 (충남대학교 생물환경화학과)
  • Received : 2010.10.13
  • Accepted : 2010.12.13
  • Published : 2010.12.31
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Abstract

Soils in the sloping uplands in Korea are subject to intensive land use with high input of agrochemicals and are vulnerable to soil erosion. Development of the environmentally sound land management strategy is essential for a sustainable production system in the sloping upland. This report addresses the status of upland agriculture and the best management practices for the uplands toward the sustainable agriculture. More than 60% of Korean lands are forest and only 21% are cultivating paddy and upland. Uplands are about 7% of the total lands and about 62% of the uplands are in the slopes higher than 7%. Due to the site-specificity of the upland, many managerial and environmental problems are occurring, such as severe erosion, shallow surface soils with rocky fragments, and loadings of non-point source (NPS) contaminants into the watershed. Based on the field trials, most of the sloping uplands were classified as Suitability Class III-V and the major limiting factor was slope and rock fragments. Due to this, soils were over-applied with N fertilizer, even though N rate was the recommendation. This resulted in decreases in yield, degradation of soil quality and increases in N loading to the leachate. Various case studies drew management practices toward sustainable production systems. The suggested BMP on the managerial, vegetative, and structural options were to practice buffer strips along the edges of fields and streams, winter cover crop, contour and mulching farming, detention weir, diversion drains, grassed waterway, and slope arrangement. With these options, conservation effects such as reductions in raindrop impact, flow velocity, runoff and sediment loss, and rill and gully erosion were observed. The proper management practice is a key element of the conservation of the soil and water in the sloping upland.

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References

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