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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2021.5
- 수록면
- 257 - 263 (7page)
이용수
초록· 키워드
Electrical conductivity (EC) is a robust indicator of soil salinity. In South Korea, EC of 1:5 of soil:water extracts (EC<SUB>1:5</SUB>) and soil saturated paste extracts (EC<SUB>e</SUB>) are often used. The standard shaking time is 0.5 hr for EC<SUB>1:5</SUB> and standing time after soil saturation is 16 hrs for EC<SUB>e</SUB>. In this study, we investigated the effects of equilibrium time (shaking and standing time for EC<SUB>1:5</SUB> and EC<SUB>e</SUB>, respectively) to test if the standard time is enough for precise and accurate measurement of EC. Two soils (silt loam and sandy loam) with seven levels of EC were prepared by adding salt solutions (1, 2, 4, 8, 12, 16, and 24 dS m<SUP>-1</SUP>) to the soils. The soils were used for experiments after 2-months aging. The EC<SUB>1:5</SUB> was measured after shaking soil-water mixture for 0.5, 1, 2, and 3 hrs, and EC<SUB>e</SUB> was determined after standing the saturated soils for 4, 8, 16, 24, and 48 hrs. The results showed that 4 hrs of standing time for EC<SUB>e</SUB> are sufficient for most saline soils regardless of soil texture. However, occasional occurrence of large variations in EC<SUB>e</SUB> up to 25% indicates a necessity of longer (e.g., 24 hrs) standing time for some soils. Therefore, for long-term monitoring of EC<SUB>e</SUB>, it may be necessary to determine site-specific standing time for EC<SUB>e</SUB>. Unlike EC<SUB>e</SUB>, the variations in EC<SUB>1:5</SUB> with shaking time was negligible. However, for soils treated with solution of high EC (24 dS m<SUP>-1</SUP>), the variability increased up to 6% variations. Therefore, it may be necessary to increase shaking time to 1 hr to ensure a precise measurement of EC<SUB>1:5</SUB> particularly for high-saline soils.
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목차
- ABSTRACT
- Introduction
- Materials and Methods
- Results and Discussion
- Conclusions
- References
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UCI(KEPA) : I410-ECN-0101-2021-523-001748781
