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Soil water content determination using a network analyzer and coaxial probe

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

View larger version (18K): [in a new window]   Fig. 1 Schematic of a coaxial probe

View larger version (18K): [in a new window]   Fig. 2 Linear calibration data for two coaxial probes in known standards

View larger version (16K): [in a new window]   Fig. 3 Measured refractive index ( ) of liquids and air vs. refractive index calculated by a mixing model

View larger version (24K): [in a new window]   Fig. 4 Water content vs. refractive index for several soils. Data points are the means of about 10 measurements and error bars denote standard deviations

View larger version (21K): [in a new window]   Fig. 5 Refractive index ( ) vs. water content relationship in Sparta sand showing coaxial probe (CP) data and regression lines from other methods including time domain reflectometry (TDR)