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Relative to montmorillonitic or kaolinitic soils, volcanic soils have atypical dielectric characteristics that interfere with the applicability of the Time Domain Reflectometry (TDR) technique for soil moisture (θ) determination when common, empirical calibration equations are used. This particular dielectric response affects estimation of salinity in volcanic soils. Six TDR-based methods to estimate...
The transmission of an electromagnetic wave through the soil using time domain reflectometry (TDR) permits the determination of its water content, θ, given the composite dielectric constant of the soil, ε c , via Topp's equation. This is possible since the dielectric constant of water is much larger than that of the soil's solid phase (80 vs. 5) and, therefore, changes in soil moisture content...
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