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Soil Water Content Measurement with a High-Frequency Capacitance Sensor

✍ Scribed by C.M.K. Gardner; T.J. Dean; J.D. Cooper

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 306 KB
Volume: 71
Category: Article
ISSN: 0021-8634
DOI: 10.1006/jaer.1998.0338

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✦ Synopsis

The calibration of a capacitance sensor (operating at 80-150 MHz) for monitoring soil water content is described. The capacitance of two electrodes inserted into soil is used to measure the dielectric properties of the soil, soil water content being the principal factor influencing these properties. A probe designed for measuring surface soil water content was used in laboratory trials to determine what other soil factors influence capacitance measurement by the sensor. The probe was first calibrated with known dielectrics and the results are presented in terms of relative permittivity . Trials demonstrated that well-defined relationships between and can be obtained for individual soils. A comparison of measurements made in several soils showed that differences in dry bulk density were important but clay and organic matter content were not. The measurements obtained, and their dependence on and density, accord well with measurements by other methods.

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