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http://dx.doi.org/10.7857/JSGE.2021.26.6.157

Comparison of Various EC Sensors for Monitoring Soil Temperature, Water Content, and EC, and Its Relation to Ion Contents in Agricultural Soils  

Park, Jin Hee (Chungbuk National University, Department of Environmental and Biological Chemistry)
Sung, Jwakyung (Chungbuk National University, Department of Crop Science)
Publication Information
Journal of Soil and Groundwater Environment / v.26, no.6, 2021 , pp. 157-164 More about this Journal
Abstract
Smart agriculture requires sensing systems which are fundamental for precision agriculture. Adequate and appropriate water and nutrient supply not only improves crop productivity but also benefit to environment. However, there is no available soil sensor to continuously monitor nutrient status in soil. Electrical conductivity (EC) of soil is affected by ion contents in soil and can be used to evaluate nutrient contents in soil. Comparison of various commercial EC sensors showed similar water content and EC values at water content less than 20%. Soil EC values measured by sensors decreased with decreasing soil water content and linearly correlated with soil water content. EC values measured by soil sensor were highly correlated with water soluble nutrient contents such as Ca, K, Mg and N in soil indicating that the soil EC sensor can be used for monitoring changes in plant available nutrients in soil.
Keywords
EC sensor; Nutrient; Nitrate; Water content; Smart farm;
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