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

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dc.identifier.uri http://dx.doi.org/10.15488/4177
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/4211
dc.contributor.author Dettmann, Ullrich
dc.contributor.author Bechtold, Michel
dc.date.accessioned 2018-12-14T13:58:57Z
dc.date.available 2018-12-14T13:58:57Z
dc.date.issued 2018
dc.identifier.citation 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
dc.description.abstract 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. eng
dc.language.iso eng
dc.publisher Washington, DC : Soil Science Society of America
dc.relation.ispartofseries Vadose Zone Journal 17 (2018), Nr. 1
dc.rights CC BY-NC-ND 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject Calibration eng
dc.subject Electric conductivity eng
dc.subject Manufacture eng
dc.subject Permittivity eng
dc.subject Porous materials eng
dc.subject Soil moisture eng
dc.subject Dielectric permittivities eng
dc.subject Electrical conductivity eng
dc.subject Measurement concepts eng
dc.subject Measurements of eng
dc.subject Reference solution eng
dc.subject Soil water content eng
dc.subject Time domain reflectometry probes eng
dc.subject Volumetric water content eng
dc.subject Probes eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.title Evaluating commercial moisture probes in reference solutions covering mineral to peat soil conditions
dc.type Article
dc.type Text
dc.relation.issn 15391663
dc.relation.doi https://doi.org/10.2136/vzj2017.12.0208
dc.bibliographicCitation.issue 1
dc.bibliographicCitation.volume 17
dc.bibliographicCitation.firstPage 170208
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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