Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Measurement of Exchangeable Cations in Salt Accumulated Vinyl Greenhouse Soils

염류집적 비닐하우스 토양의 교환성 양이온 측정

  • Chung, Jong-Bae (Division of Life and Environmental Science, Daegu University) ;
  • Lee, Yong-Se (Division of Life and Environmental Science, Daegu University) ;
  • Jeong, Byeong-Ryong (Division of Life and Environmental Science, Daegu University)
  • 정종배 (대구대학교 생명환경대학 생명환경학부) ;
  • 이용세 (대구대학교 생명환경대학 생명환경학부) ;
  • 정병룡 (대구대학교 생명환경대학 생명환경학부)
  • Received : 2018.01.31
  • Accepted : 2018.03.23
  • Published : 2018.03.31
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Abstract

BACKGROUND: Although 1 M $NH_4OAc$ (pH 7.0) is predominantly used as the extractant of exchangeable cations in agricultural soils, this method is unsuitable for extracting the cations in saline and calcareous soils. This study was performed to select a proper method to determine exchangeable cations in vinyl greenhouse soils. METHODS AND RESULTS: Exchangeable cations (Ca, Mg, K, Na) in saline vinyl greenhouse soils were determined after extraction with 1 M $NH_4OAc$ (pH 7.0 and 8.5) and 1 M alcoholic $NH_4Cl$ (pH 8.5). Sum of exchangeable cations of the soils extracted with 1 M $NH_4OAc$ at pH 7.0 was 1.9-2.5 times greater than soil cation exchange capaity determined at pH 7.0, even though soluble salts were pre-removed. A similar result was found when the cations were extracted with 1 M $NH_4OAc$ at pH 8.5. Those results are mostly due to the overestimation of exchangeable Ca and Mg, linked to a partial dissolution of sparingly soluble salts in $NH_4OAc$ solution. When extracted with 1 M alcoholic $NH_4Cl$ at pH 8.5, extractable Ca and Mg decreased significantly due to the lower solubility of Ca and Mg carbonates in the extractant. And the sum of exchangeable cations was very close to the corresponding exchange capacity of soils. CONCLUSION: Alcoholic $NH_4Cl$ (pH 8.5) is proposed as a reliable extractant in determination of exchangeable cations in saline vinyl greenhouse soils. And soluble salts should be removed prior to the extraction of exchangeable cations.

가용성 및 난용성 염류가 집적된 비닐하우스 토양의 교환성 양이온을 가용성 염류의 사전 제거 처리 없이 pH 7.0의 1 M $NH_4OAc$ 용액으로 추출하여 측정할 경우 비교환성 양이온의 용출로 인해 특히 교환성 Ca과 Mg의 함량이 실제보다 훨씬 과다하게 측정될 수 있다. 본 연구의 결과, 노지 토양의 경우에는 1 M $NH_4OAc$(pH 7.0) 용액으로 추출하여 측정한 교환성 양이온 함량의 합은 pH 7.0에서 측정된 CEC를 초과하지 않았으나 비닐하우스 토양의 경우에는 가용성 염류를 사전에 제거하더라도 CEC의 1.9-2.5배 정도로 과다하게 측정되었다. 가용성 염류를 사전에 제거한 후 pH 8.5의 1 M alcoholic $NH_4Cl$ 용액으로 추출하여 측정한 비닐하우스 토양의 교환성 양이온의 합은 pH 7.0에서 측정된 CEC에 매우 근접하였다. 이와 같은 결과는 pH 8.5의 alcoholic $NH_4Cl$ 용액에서 Ca과 Mg의 탄산염을 포함한 토양 중의 난용성 염류의 용해가 억제되었기 때문이다. 따라서 가용성 염류를 사전에 제거하고 $NH_4OAc$ 용액 대신 alcoholic $NH_4Cl$ 용액으로 교환성 양이온을 추출 정량함으로써 비닐하우스 토양의 교환성 양이온을 보다 정확하게 측정할 수 있을 것으로 판단된다.

Keywords

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