Advances in the ECe prediction from EC1:5

Seo-Woo Park; Nuri Baek; Eun-Seo Shin; Woo-Jung Choi

doi:10.7745/KJSSF.2024.57.1.073

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2024 Vol.57, Issue 1 Preview Page

Opinion

Advances in the EC_e prediction from EC_1:5

29 February 2024. pp. 73-78

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Abstract

The standard measure of soil salinity is electrical conductivity (EC) of saturated soil paste extracts (EC_e). However, measuring EC_e is labor and time-consuming and the accuracy of EC_e is dependent on individual skill. As an alternative, the electrical conductivity of the extracts of 1:5 soil:water ratio (EC_1:5) is commonly used, and thus the conversion of EC_1:5 to EC_e is necessary for the practical use of EC_1:5. Recently, a multiple regression model for the estimation of conversion factors (CF) using clay content and exchangeable sodium percentage (ESP) has been developed: CF = 7.179 - 0.084 × Clay + 1.096 × ln(ESP). In this study, the CF model was validated using unpublished data on EC (EC_1:5 and EC_e), clay content, and ESP that were obtained from 50 paddy fields (n = 100 including two depth) of five reclaimed tidelands located in the coastal areas of South Korea. The CFs ranged from 5.7 to 11.9, and the measured and predicted EC_e were linearly correlated (r² = 0.81, P < 0.001) with an error of 11.2%. Despite the potential errors, we suggest that converting EC_e from EC_1:5 using the CF model may be a feasible method for long-term monitoring of EC_e with the consideration of the time and cost and inconsistent accuracy of EC_e measurement as clay content and ESP are the basic soil monitoring parameters in saline soil survey projects.

Correlation between EC_e measured and EC_e predicted from EC_1:5.

Keywords

Coastal saline soil

Electrical conductivity

Exchangeable sodium percentage

Reclaimed tideland

Soil salinity

Soil texture

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Information

Publisher :Korean Society of Soil Science and Fertilizer
Publisher(Ko) :한국토양비료학회
Journal Title :Korean Journal of Soil Science and Fertilizer
Journal Title(Ko) :한국토양비료학회 학회지
Volume : 57
No :1
Pages :73-78
Received Date : 2024-01-30
Revised Date : 2024-02-13
Accepted Date : 2024-02-13
DOI :https://doi.org/10.7745/KJSSF.2024.57.1.073

Korean Journal of Soil Science and FertilizerISSN:0367-6315(Print) 2288-2162(Online)한국토양비료학회

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