Discussion on Dilution Factor for Electrical Conductivity Measured by Saturation-paste Extract and 1:5 Soil to Water Extract, and CEC of Korean Soils

한국 토양에 대한 포화침출액법과 1:5 법에 의한 전기전도도 간의 희석배수와 CEC의 관계에 대한 고찰

  • Jung, Yeong-Sang (College of Agriculture and Life Sciences, Kangwon National University) ;
  • Joo, Jin-Ho (College of Agriculture and Life Sciences, Kangwon National University) ;
  • Hong, Sun-Dal (Chungbuk National University) ;
  • Lee, In-Bog (National Horticultural Research Institute, RDA) ;
  • Ro, Hee-Myong (National Horticultural Research Institute, RDA)
  • Published : 2001.02.28


Linear regression analyses between the electrical conductivity of the saturation-paste extract. ECe, and the electrical conductivity of the 1:5 soil extract, EC1:5, for different soils yielded different dilution factors, or slopes with significant $r^2$ values from 0.842 to 0.905. The dilution factor was inversely proportional to the cation exchange capacity of soil which reflected textural difference. The dilution factors recommended for different textural classes ranged from 6.44 for clay soil to 12.29 for sandy soil based on the CEC's of the textural classes among 350 surface soils recorded in the Taxonomical Classification of Korean Soils except volcanic ash derived soils. Though saturation percentage of the saturation-paste of the soils in this study, CEC should be taken into account for dilution factor between ECe and EC1:5, and the suggested dilution factors might be reasonable estimate for the soil textural classes.