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Electrical Spectra of Undisturbed Soil from a Crop Rotation Study

National Soil Tilth Lab., 2110 University Blvd., Ames, IA 50011

View larger version (8K): [in this window] [in a new window]   Fig. 1. Diagram of the 12-wire, quasi-coaxial probe.

View larger version (10K): [in this window] [in a new window]   Fig. 2. Measured apparent permittivity (a) at the resonance frequency (Eq. [5]) as a function of that predicted from a volumetric mixing model (Eq. [7]), best fit with an exponent of 1. The dashed line is the 1:1 line.

View larger version (14K): [in this window] [in a new window]   Fig. 3. Sample permittivity spectra at three water contents for (a) real and imaginary components, and (b) calculated apparent permittivity.

View larger version (15K): [in this window] [in a new window]   Fig. 4. Soil effects on electrical conductivity as a function of air-filled porosity grouped by soils with or without free CaCO3.