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- W2024883355 abstract "An increasing number of electromagnetic (EM) sensors are deployed to measure volumetric soil water content (θ) for agricultural, ecological, and geotechnical applications. While impedance and capacitance sensors generally operate at frequencies between 20–300 MHz, time domain‐reflectometry (TDR) and‐transmissometry (TDT) function in the GHz range. In general, lower frequency sensors are less expensive but more sensitive to confounding effects of salinity, temperature, and soil textural variations. To simplify sensor application, factory‐supplied calibrations are often provided for different porous media types such as mineral, organic, and saline soils, or soilless‐substrates. The objective of the presented study was to evaluate the performance of eight commercially available EM moisture sensing systems (TDR 100, CS616, Theta Probe, Hydra Probe, SM300, Wet2, 5TE, 10HS) in seven well‐characterized and texturally varying soils using a standardized approach. The validity of factory supplied‐calibration relationships was evaluated and the influence of soil properties on the EM responses for θ measurements was observed. Results indicate that the factory‐supplied calibration relationships for groups of mineral and organic soils in general performed well, but some inconsistences were identified and suggestions for improvement are discussed. Soil‐specific calibrations from this study yielded accuracies of around 0.015 m 3 m −3 for 10HS, SM300, and Theta Probe, while lower accuracies of about 0.025 m 3 m −3 were found for TDR100, CS616, Wet2, 5TE, and the Hydra Probe. These results are based on mineral soils having a large variation in texture, electrical conductivities below 2 dS m −1 , organic matter below 10%, and specific surface areas of less than 50 m 2 g −1 ." @default.
- W2024883355 created "2016-06-24" @default.
- W2024883355 creator A5012038977 @default.
- W2024883355 creator A5031016144 @default.
- W2024883355 creator A5073515088 @default.
- W2024883355 creator A5077009299 @default.
- W2024883355 date "2013-05-01" @default.
- W2024883355 modified "2023-10-06" @default.
- W2024883355 title "Evaluation of Standard Calibration Functions for Eight Electromagnetic Soil Moisture Sensors" @default.
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- W2024883355 doi "https://doi.org/10.2136/vzj2012.0160" @default.
- W2024883355 hasPublicationYear "2013" @default.
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