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Soil Particle Concentrations and Size Analysis Using a Dielectric Method

^a USDA-ARS Southwest Watershed Research Center, P.O. Box 213, Tombstone, AZ 85638 USA
^b Dep. of Soil Science, Univ. of Wisconsin, 1525 Observatory Dr., Madison, WI 53706-1299 USA

View larger version (24K): [in a new window]   Fig. 1 Schematic of the dielectric particle-size analysis system

View larger version (10K): [in a new window]   Fig. 2 Probe arrangement for determining effective probe measurement depth

View larger version (13K): [in a new window]   Fig. 3 Relationship between refractive index and concentration of the clay fraction (<2 µm) of Plano soil

View larger version (22K): [in a new window]   Fig. 4 Measurement depth of the coaxial probe. Derivatives calculated by the modified Savitzky-Golay method of Barak (1995)

View larger version (28K): [in a new window]   Fig. 5 Testing and calibration of the dielectric system in silica silt

View larger version (34K): [in a new window]   Fig. 6 Time interval of initial signal averaging and its impact on concentration measurements

View larger version (36K): [in a new window]   Fig. 7 Concentration ratio (C/C0) vs. time for several soils

View larger version (26K): [in a new window]   Fig. 8 Summation curves for several soils