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Published online 16 November 2005
Published in Vadose Zone J 4:1004-1010 (2005)
DOI: 10.2136/vzj2005.0028
© 2005 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Calibration of a Capacitance System for Measuring Water Content of Tropical Soil

V. Polyakov*, A. Fares and M. H. Ryder

Department of Natural Resources and Environmental Management, University of Hawaii, 1910 East-West Road, Honolulu, HI 96822


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  		Fig. 1. Measured volumetric water content versus scaled frequency and corresponding calibration models for Ewa silty clay loam on a rangeland site.

 


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  		Fig. 2. Measured volumetric water content versus scaled frequency and corresponding calibration models for Ewa silty clay loam on a cultivated terrace site.

 


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  		Fig. 3. Measured volumetric water content versus scaled frequency and corresponding calibration models for all field data for the Ewa silty clay loam.

 


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  		Fig. 4. Measured volumetric water content versus scaled frequency and corresponding calibration models for laboratory soil and sand columns.

 


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  		Fig. 5. Comparison of calibration models developed for rangeland, cultivated terrace, combined field data, laboratory soil and sand columns, and default manufacturer equation.

 


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  		Fig. 6. The effect of temperature on volumetric water content measurement using MCS. Capacitance sensor measurement is represented as a ratio {theta}T/{theta}23, where {theta}T and {theta}23 are the soil water content at temperature T and 23°C, respectively.

 




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