Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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A Modified Methodology of Salt Removal through Flooding and Drainage in a Plastic Film House Soil

시설재배지에서 토양 담수 및 배수에 의한 염류집적 경감 방안

  • Oh, Sang-Eun (Department of Biological Environment, Kangwon National University) ;
  • Son, Jung-Su (Department of Biological Environment, Kangwon National University) ;
  • Ok, Yong-Sik (Department of Biological Environment, Kangwon National University) ;
  • Joo, Jin-Ho (Department of Biological Environment, Kangwon National University)
  • 오상은 (강원대학교 바이오자원환경학과) ;
  • 손정수 (강원대학교 바이오자원환경학과) ;
  • 옥용식 (강원대학교 바이오자원환경학과) ;
  • 주진호 (강원대학교 바이오자원환경학과)
  • Received : 2010.07.26
  • Accepted : 2010.10.22
  • Published : 2010.10.30
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Abstract

One of the disadvantages of flooding treatment for desalting from soils is that salts move to deep soils after flooding and at the end reaccumulate at the soil surface through capillary movements. This study was carried out to remove salts from soils in plastic film houses by a modified flooding method, drainage after flooding. The method successfully removed salts at the soil surface and salts did not move to the deep soil. Drained water containing N, P and K could be reused as fertilizer. By applying small amount of MgO, turbidity of water flooded decreased in 30 min by 95%. Struvite should be formed since the flooded water contain ammonia and phosphorous and their concentrations were decreased. This could be utilized as fertilizer which provides a slow-release source of phosphorus, magnesium and nitrogen that features low inherent water solubility.

시설하우스 내 토양의 염류를 제거하기 위한 기존 관수제염의 문제점은 담수 시 염류가 심토층으로 이동하게 되며 심토층으로 이동된 염류는 시설하우스 내 모세관현상으로 다시 표토층으로 용출되어 순환을 하는 것이다. 이를 해결하기 위하여 기존의 관수제염법을 일부 수정한 방법을 개발하였다. 토양을 담수시킨 후 부유물질을 침전시키고 상등액의 일부를 외부로 빼줌으로써 토양 하부로 염류가 이동하지 않도록 하는 방법이다. 이 방법을 통해 심토층으로 염류가 확산이 되지 않았으며 모세관 현상에 의한 염류의 재집적을 방지 할 수 있을 것으로 판단된다. 또한 밖으로 유출되는 상등액에는 질소, 인, 칼리 등 비료성분을 포함하고 있어 비료로 재이용될 수 있을 것으로 판단된다. 소량의 MgO 투여와 30분 침전을 통해 담수의 탁도 성분을 초기 탁도의 95%이상을 침전 시킬 수 있었다. 담수 내에 암모니아와 인을 함유하고 그들의 농도가 줄어든 것으로 보아 일부 struvite 침전이 이루어졌으며 토양 내에서 천천히 용해되어 작물이 이용할 수 있을 것으로 판단된다.

Keywords

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