The evaluation of water content measurments using TDR
2000
Matula, S. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic))
TDR (Time Domain Reflectometry) is an accurate and widely used rapid and non-destructive method for determination of volumetric soil water content Theta of porous media in situ and in laboratory. The objective of this study was to test 23 empirical models to evaluate TDR measurment and calculate Theta (Epsilon) for the fine earth samples prepared from certain horizons of three tipical soils commonly found in the Czech Republic. The TDR results were compared to the data determined by gravimetry. The results of those comparisons shown that there is not any acceptable model for material of Orthic Luvisol, model 5 gives good results for Eutric Regosol and models 3, 4, 14 and 15 are good for loess. Absolutely not useful in any case is model 10. The application of recommended models for tested soils can improve accuracy of soil water content calculations from TDR measurements.
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