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Time Domain Reflectometry Field Calibration in the Little Washita River Experimental Watershed

USDA-ARS Grazinglands Research Laboratory, 7207 W. Cheyenne, El Reno, OK 73036

View larger version (36K): [in a new window]   Fig. 1. Map of Little Washita River Experimental Watershed nine time domain reflectometry sites and Micronet locations.

View larger version (32K): [in a new window]   Fig. 2. Linear relationships between soil-core water content and time domain reflectrometry time delay for (a) Site 136, (b) Site LW02, (c) Site 134, (d) Site 154, (e) nine sites, and (f) the regional linear model.

View larger version (34K): [in a new window]   Fig. 3. Comparisons between time domain reflectometry and soil-core water contents using the calibration data set for (a) Method 1, (b) Method 2, (c) Method 3, (d) Method 4, and (e) Method 5.

View larger version (30K): [in a new window]   Fig. 4. Comparisons between time domain reflectometry and soil-core water contents using the independent data set for (a) Method 1, (b) Method 2, (c) Method 3, (d) Method 4, and (e) Method 5.