Performance evaluation of a recently developed soil water content, dielectric permittivity, and bulk electrical conductivity electromagnetic sensor

George Kargas and Konstantinos X. Soulis

Agricultural Water Management, 2019, vol. 213, issue C, 568-579

Abstract: CS655 Water Content Reflectometer (WCR) (Campbell Scientific, Inc., Logan, UT, USA) is a recently developed multiparameter electromagnetic sensor measuring volumetric soil water content (θ), bulk soil electrical conductivity (σb), and temperature. In this study, CS655 sensor’s performance was investigated through laboratory experiments using a set of liquids with known dielectric and salinity properties and soils featuring a wide range of conditions (including physico-chemical properties, water regimes and salinity of the water solution). The sensor’s performance was analyzed in comparison with WET and ML2 theta probe (Delta-T Device Ltd, Cambridge, UK) dielectric sensors. It was found that CS655 apparent dielectric permittivity (εa) readings were higher than that of Topp’s permittivity-water content relationship, especially at higher soil water content values, as much as 12 dimensionless permittivity units. The results suggested that the relationship between experimentally measured soil water content (θm) and εa was strongly linear (0.911Keywords: Electromagnetic sensors; Soil moisture; CS655 sensor; Water content reflectometers; Dielectric permittivity; Bulk electrical conductivity (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:eee:agiwat:v:213:y:2019:i:c:p:568-579

DOI: 10.1016/j.agwat.2018.11.002

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