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Comparison of Capacitance-Based Soil Water Probes in Coastal Plain Soils

USDA-ARS, Southeast Watershed Research Laboratory, P.O. Box 748, Tifton, GA 31793

View larger version (23K): [in a new window]   Fig. 1. Example results of the Stevens-Vitel Hydra probe laboratory tests comparing the observed data with the predicted values using the factory-provided equations for the different soil types.

View larger version (28K): [in a new window]   Fig. 2. Comparison between the predicted values of soil water from the Stevens-Vitel factory equation for sands, the Topp equation, and the Ellor–Denoth equation for the observed soil water for the examined soil samples.

View larger version (31K): [in a new window]   Fig. 3. Observed and predicted soil water for the Tifton Ap laboratory analysis sample versus temperature-corrected real dielectric.

View larger version (28K): [in a new window]   Fig. 4. Deviation from the observed soil water for the Tifton Ap laboratory sample obtained using the calibration equation for that soil.

View larger version (24K): [in a new window]   Fig. 5. Example results of the Echo probe laboratory tests comparing the observed data with the predicted values using the factory-provided equations for the different soil types and probe lengths.

View larger version (36K): [in a new window]   Fig. 6. Deviation from the observed soil water from the Echo probe predictions calculated using the calibration equations determined through linear regression for the Tifton Ap and Fuquay Ap soils.

View larger version (32K): [in a new window]   Fig. 7. Comparison between the predicted values of soil water from the Hydra probe factory equation for sands and the observed soil water for the field data.

View larger version (21K): [in a new window]   Fig. 8. Standardized residuals (residual divided by the observed soil water content) for the Hydra probe factory predictions of soil water for the field data.

View larger version (40K): [in a new window]   Fig. 9. Comparison between the predicted values of soil water from the (a) Topp equation and (b) calibration equation for the Fuquay Ap soil and the observed soil water for the field data.

View larger version (33K): [in a new window]   Fig. 10. Standardized residuals (residual divided by the observed soil water content) for the (a) Topp equation and (b) calibration equations for the Fuquay Ap soil for the field data.