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Field Evaluation of the Dual-Probe Heat-Pulse Method for Measuring Soil Water Content

^a J.M. Ham, Department of Agronomy, Kansas State University, Manhattan, KS 66506
^b Plant and Soil Science Department, Texas Tech University, Lubbock, TX 79409
^c Rocky Mountain Research Station, U.S. Forest Service, 240 W. Prospect Rd., Fort Collins, CO 80526
^d Department of Biological and Agricultural Engineering, Kansas State University, Manhattan, KS 66506

View larger version (25K): [in a new window]   Fig. 1. Schematic diagram of the dual-probe heat-pulse sensors used in the field experiment.

View larger version (25K): [in a new window]   Fig. 2. Temporal variations in soil volumetric water content () from the five dual-probe heat-pulse (DPHP) sensors (Lines 1–5) at Site 3 for the 100-d monitoring period. The blue bars represent precipitation depth per day.

View larger version (27K): [in a new window]   Fig. 3. Diurnal variations in soil water content () and soil temperature from dual-probe heat-pulse (DPHP) sensors at Site 3 for a 5-d period with no precipitation. The blue points represent mean from five DPHP sensors. The red diamonds represent mean soil temperature (obtained before sensor activation) from the same five DPHP sensors.

View larger version (19K): [in a new window]   Fig. 4. Comparison of volumetric water content () as determined from dual-probe heat-pulse (DPHP) sensors and by soil sampling for all sites and sampling times. Each circle represents the mean of five DPHP measurements and the mean from 10 soil samples for a given site and sampling time. The error bars represent one mean standard deviation on either side of the mean water content. The dashed line is the regression model.

View larger version (18K): [in a new window]   Fig. 5. Predicted values of volumetric water content () from dual-probe heat-pulse (DPHP) sensors compared with volumetric water content () determined by soil sampling for all sites and sampling times. Values of were obtained using Eq. [7]. Each circle represents the mean of five values and the mean from 10 soil samples for a given site and sampling time. The dashed line is the regression model.

View larger version (18K): [in a new window]   Fig. 6. Predicted values of volumetric water content (') from dual-probe heat-pulse (DPHP) sensors compared with volumetric water content () determined by soil sampling for all sites and sampling times. Values of ' were obtained from Eq. [8]. Each circle represents the mean of five ' values and the mean from 10 soil samples at a given site and sampling time. The dashed line is the regression model.