FIELD EVALUATION OF CAPACITANCE PROBE
TO MEASURE SOIL WATER CONTENTABOUTALEB HEZARJARIBI, HEINZ SOURELL, GHORBAN GHORBANI NASRABAD, ABDOLREZA GHARANJIKI AND MEYSAM. ABEDINPOUR
Abstract
Capacitance probe sensors are a popular electromagnetic method of measuring soil water
content. In this study EnviroSCAN capacitance sensors were calibrated for a sandy and loamy sand
soils and the water contents estimated by calibrated equation and with those estimated by the
manufacturers default (uncalibrated) equation were statistically compared. Results demonstrated that
calibrated EnviroSCAN sensor could be used as the standard instrument to measure soil water content
in loamy sand, but it was not found as a reliable method to measure soil water content in sandy soil.
The uncalibrated equation of both of soil textures appeared to consistently understimate soil water
content. A large discrepancies existed between calibrated and uncalibrated values for both of soil
textures. Calibrated values of soil water content in loamy sand profile were close to those measured
by the soil samples. Calibration of EnviroSCAN capacitance sensor found to give more accurate
estimation of soil water content values, and essential to improve sensors performance, compared to
those obtained from the uncalibrated equation in loamy sand soil.
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