Evaluating commercial moisture probes in reference solutions covering mineral to peat soil conditions

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Dettmann, U.; Bechtold, M.: Evaluating commercial moisture probes in reference solutions covering mineral to peat soil conditions. In: Vadose Zone Journal 17 (2018), Nr. 1, 170208. DOI: https://doi.org/10.2136/vzj2017.12.0208

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Sum total of downloads: 147

Capacitance and time domain reflectometry (TDR) probes are frequently used for measurements of the volumetric soil water content. The measurement concept is based on the correlation between volumetric water content and dielectric permittivity (ε). While considerable effort has been made to accurately measure ε in the typical range of mineral soils (<40), little attention has been paid to the capability of moisture probes to measure high ε (>40), typical for highly porous media like organic soils. We evaluated the capability of two moisture probe types (TRIME-PICO 64 and GS3) to measure ε across the range from 1 to 80. In the case of the TRIME probes, different equations to calculate ε from transit times were tested. Measuring in a set of reference solutions, the TRIME probes had an RMSE of 18.73 for ε values derived using the manufacturer’s calibration. With a new calibration, the RMSE was decreased to 3.55. The GS3 probes had an RMSE of 3.96. For both probes, uncertainties increased with increasing e. We also tested the performance for different electrical conductivities of the reference solutions. Accuracy of ε values was unaffected by increasing conductivities for the TRIME probes but decreased for the GS3 probes. The GS3 probes, however, were able to determine electric conductivities accurately, while TRIME probes failed for electrical conductivity although indicated differently by the manufacturer. © Soil Science Society of America.
License of this version: CC BY-NC-ND 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2018
Appears in Collections:Naturwissenschaftliche Fakultät

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pos. country downloads
total perc.
1 image of flag of Germany Germany 55 37.41%
2 image of flag of Czech Republic Czech Republic 25 17.01%
3 image of flag of Russian Federation Russian Federation 18 12.24%
4 image of flag of United States United States 14 9.52%
5 image of flag of Iran, Islamic Republic of Iran, Islamic Republic of 6 4.08%
6 image of flag of Netherlands Netherlands 5 3.40%
7 image of flag of Poland Poland 3 2.04%
8 image of flag of Indonesia Indonesia 3 2.04%
9 image of flag of Italy Italy 2 1.36%
10 image of flag of United Kingdom United Kingdom 2 1.36%
    other countries 14 9.52%

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