Linear function for calibrating capacitance and frequency domain reflectometry (EC-5) for soil water monitoring by introducing slope-intercept relationship
2020
Mochizuki, Hidetoshi | Sakaguchi, Iwao
New calibration method of the capacitance and frequency domain reflectometry (ECH2O EC-5) for soil water monitoring was developed by introducing the slope-intercept relationship derived from the relationship between the RAW data recorded by the Em50 datalogger and the thermogravimetrically measured volumetric water content of soil. Numerous soil samples taken from paddy–upland rotational fields in western Japan were used for precise soil-specific calibration experiments to determine the variables of slope-intercept relationship. By using these identified variables and an easily available dataset of the measured volumetric water content and the RAW data, the developed linear function predicted volumetric water content of soils. The developed linear function was validated with the reported literature data, the agricultural fields experiment, and the laboratory experiment. From those three validations, the developed linear function was evaluated to be practically available for laboratory and field researches. Also, it is implied that the developed linear function is extendable to dataloggers except for the Em50 and monitoring devices excluding the EC-5.
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