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Detection Model of FDR Moisture Content Sensor Affected by Soil Salinity and Temperature

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131620155,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Wengting Han, Bei Liu
Keywords:   soil; dielectric properties; FDR; salinity; moisture content; temperature

Abstract. Soil salinity and temperature are major factors which influence dielectric properties of soil.To detect the regular of moisture measurement which based on dielectric properties, loessal soil in Shenmu county, Shaanxi Province and sandy soil in Dangshan county, Anhui Province were used to measure the output under different moisture content (4.4%~22%) ,temperature (5~50℃) and salinity (0%~1%) by the moisture content sensor which based on frequency domain reflectometry (FDR).The results showed that the output increased with temperature and soil salinity (0%~0.4%), and was no significant difference with salinity (0.4%~1%). The mathematical model between output, moisture content, salinity and temperature was established. The study is helpful for developing FDR soil moisture sensor which has temperature and salinity compensation functions.

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