Pedosphere 32(6): 905--915, 2022
ISSN 1002-0160/CN 32-1315/P
©2022 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Soil texture affects the conversion factor of electrical conductivity from 1:5 soil-water to saturated paste extracts
Bo-Seong SEO1, Young-Jae JEONG1, Nu-Ri BAEK1, Hyun-Jin PARK1,2, Hye In YANG3, Se-In PARK4, Woo-Jung CHOI1,5
1Department of Rural and Bio-systems Engineering(BK21), Chonnam National University, Gwangju 61186(Republic of Korea)
2Department of Renewable Resources, University of Alberta, Edmonton, Alberta T6G 2E3(Canada)
3Max Planck Institute for Biogeochemistry, Jena 07745(Germany)
4National Institute of Environmental Research, Incheon 22689(Republic of Korea)
5AgriBio Institute of Climate Change Management, Chonnam National University, Gwangju 61186(Republic of Korea)
ABSTRACT
      Electrical conductivity (EC) of soil-water extracts is commonly used to assess soil salinity. However, its conversion to the EC of saturated soil paste extracts (ECe), the standard measure of soil salinity, is currently required for practical applications. Although many regression models can be used to obtain ECe from the EC of soil-water extracts, the application of a site-specific model to different sites is not straightforward due to confounding soil factors such as soil texture. This study was conducted to develop a universal regression model to estimate a conversion factor (CF) for predicting ECe from EC of soil-water extracts at a 1:5 ratio (EC1:5), by employing a site-specific soil texture (i.e., sand content). A regression model, CF=8.910 5e0.010 6sand/1.298 4 (r2=0.97, P < 0.001), was developed based on the results of coastal saline soil surveys (n=173) and laboratory experiments using artificial saline soils with different textures (n=6, sand content=10%-65%) and salinity levels (n=7, salinity=1-24 dS m-1). Model performance was validated using an independent dataset and demonstrated that ECe prediction using the developed model is more suitable for highly saline soils than for low saline soils. The feasibility of the regression model should be tested at other sites. Other soil factors affecting EC conversion factor also need to be explored to revise and improve the model through further studies.
Key Words:  coastal saline soils,electrical conductivity prediction,reclaimed tideland,regression model,sand content,saturation percentage,soil salinity
Citation: Seo B S, Jeong Y J, Baek N R, Park H J, Yang H I, Park S I, Choi W J. 2022. Soil texture affects the conversion factor of electrical conductivity from 1:5 soil-water to saturated paste extracts. Pedosphere. 32(6): 905-915.
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