Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Effects of Lime and Humic Acid on the Cadmium Availability and its Uptake by Rice in Paddy Soils

논토양중 카드뮴 유효도와 수도의 흡수이행에 미치는 석회 및 Humic acid 시용효과

  • Kim, Min-Kyeong (National Institute of Agricultural Science and Technology, RDA) ;
  • Kim, Won-Il (National Institute of Agricultural Science and Technology, RDA) ;
  • Jung, Goo-Bok (National Institute of Agricultural Science and Technology, RDA) ;
  • Park, Kwang-Lai (National Institute of Agricultural Science and Technology, RDA) ;
  • Yun, Sun-Gang (National Institute of Agricultural Science and Technology, RDA) ;
  • Eom, Ki-Cheol (National Alpine Agricultural Experiment Station, RDA)
  • 김민경 (농업과학기술원 농업환경부) ;
  • 김원일 (농업과학기술원 농업환경부) ;
  • 정구복 (농업과학기술원 농업환경부) ;
  • 박광래 (농업과학기술원 농업환경부) ;
  • 윤순강 (농업과학기술원 농업환경부) ;
  • 엄기철 (고령지농업시험장)
  • Published : 2004.03.31
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Abstract

This study was conducted to how the effect of lime and humic acid on cadmium availability and ie uptake by plant grown in contaminated paddy soils with heavy metal. The treatment levels of lime were 2.5 and 5.0 ton/ha and that of humic acid were 1 and 2%. The contents of 0.1N HCl extractable Cd were reduced with lime and humic acid and were negatively correlated with CEC as well as soil pH. The sequential extraction procedure was used to fractionate the heavy metals in soils into the designated from exchangeable (0.5 M $KNO_3$) water soluble ($H_2O$), organically bound (0.5 M NaOH), carbonate (0.05 M $Na_{2-}$ EDTA) and sulfide/residual (4 M $HNO_3$). In soil amended with 2.5 ton/ha lime and 1% humic acia che- mical forms of Cd at tillering stage were predominant exchangeable + water soluble extractable Cd, whereas that at harvesting stage were predominant carbonate + sulfide/residual extractable Cd. The exchangeable forms of Cd in soil with lime and humic acid were negatively correlated with soil pH during the harvesting period. Total absorbed Cd of paddy rice tended to occur in the order of root > stem > leaf > brown rice. Cd contents of brown rice with lime and humic acid treatment were 0.09 and 0.08 mg/kg, respectively. That were lower than control, 0.20 mg/kg. It could be that treatment of lime and humic acid in polluted soil by heavy metals would reduce the uptake of heavy metals by piano and be a temporary method of reclamation at the highly heavy Metal contaminated soils.

토양중 중금속이 식물에 흡수 및 이행되는 것을 경감시켜 여기에서 생산된 농산물의 안전성 향상을 위한 기초자료를 확보하고 논토양의 카드뮴 유효도와 흡수이행에 미치는 석회와 humic acid 처리 효과를 구명하기 위하여 실내실험과 포트실험을 수행하였다. 실내실험에서 공시토양에 2.5와 5.0 ton/ha의 석회와 1%와 2% humic acid를 처리한 후 토양중 가용성 카드뮴 함량 변화를 조사한 결과 두 처리 모두 14일까지는 담수상태에서 처리효과로 인하여 가용성 카드뮴 함량이 감소하다가 그 이후에는 토양의 완충능에 의해 다시 증가하는 경향이었다. 이때, 토양의 가용성 카드뮴 함량은 토양 pH 및 양이온치환용량과 부의 상관이 있었다. 2.5 ton/ha의 석회와 1%의 humic acid를 처리한 후 담수시켜 안정화된 다음 벼를 재배하여 조사한 결과, 석회와 humic acid 처리에 비해 분얼기와 수확기의 치환태 및 수용태 카드뮴 함량이 낮아졌으나, 분얼기에 비해 수확기에 토양중 이동이 어려운 산화물 및 탄산염태와 황화물 및 잔류태의 함량이 증가하였다. 식물에 흡수가 용이한 형태로 알려진 치환태와 수용태는 모두 토양 pH와 고도의 부의 상관이 있었다. 수확기의 줄기, 잎 및 현미 건물 중은 석회 및 humic acid 처리구에서 대조구에 비해 모두 높았고, 특히 석회 처리구의 건물중이 현저하게 높았다. 석회 처리구에서 줄기와 잎의 카드뮴 함량은 각각 1.01과 0.37 mg/kg으로 대조구와 비슷하였으나, 뿌리와 현미의 카드뮴 함량은 각각 2.11과 0.09 mg/kg으로 대조구에 비해 낮았다. 지상부와 뿌리의 카드뮴 함량은 humic acid 처리에 의해 현저히 낮아졌으며, 특히 현미로의 카드뮴 이행도 월등히 낮게 나타났다.

Keywords

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