Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Assessment of Electrical Conductivity of Saturated Soil Paste from 1:5 Soil-Water Extracts for Reclaimed Tideland Soils in South-Western Coastal Area of Korea

  • Park, Hyun-Jin (Department of Rural & Biosystems Engineering, Chonnam National University) ;
  • Yang, Hye In (Department of Rural & Biosystems Engineering, Chonnam National University) ;
  • Park, Se-In (Department of Rural & Biosystems Engineering, Chonnam National University) ;
  • Seo, Bo-Seong (Department of Rural & Biosystems Engineering, Chonnam National University) ;
  • Lee, Dong-Hwan (Department of Rural & Biosystems Engineering, Chonnam National University) ;
  • Kim, Han-Yong (Department of Applied Plant Science, Chonnam National University) ;
  • Choi, Woo-Jung (Department of Rural & Biosystems Engineering, Chonnam National University)
  • Received : 2019.05.03
  • Accepted : 2019.06.25
  • Published : 2019.06.30
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Abstract

BACKGROUND: Measurement of electrical conductivity of saturated soil paste ($EC_e$) for assessment of soil salinity is time-consuming, and thus conversion of EC of 1:5 soil-water extract ($EC_{1:5}$) to $EC_e$ using a dilution factor may be of help to monitor salinity of huge number of soil samples. This study was conducted to evaluate the dilution factor for reclaimed tideland (RTL) soils of South Korea. METHODS AND RESULTS: Soil samples (n=40) were collected from four RTLs, and analyzed for $EC_{1:5}$, $EC_e$, and cation compositions of 1:5 soil-water extract. The dilution factor (8.70) was estimated by regression analysis between $EC_{1:5}$ and $EC_e$, and the obtained dilution factor was validated by applying to an independent data set (n=96) of $EC_{1:5}$ and $EC_e$. The $EC_e$ measured and predicted was strongly correlated ($r^2=0.74$, P<0.001), but $EC_e$ was overestimated by 16% particularly for the soils with high clay content and low sodium adsorption ratio (SAR). CONCLUSION: This study suggests that using the dilution factor to convert $EC_{1:5}$ to $EC_e$ is feasible method to monitor changes in the soil salinity of the study RTL. However, overestimation of $EC_e$ should be cautioned for the soils with high clay content and low SAR.

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References

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