Calibration equations for two capacitance water content probes
 
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1
Department of Hydraulics, Soil Science and Agricultural Engineering,Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
2
National Agricultural Research Foundation, Land Reclamation Institute, 57400, Thessaloniki, Greece
 
Int. Agrophys. 2012, 26(3): 285–293
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ABSTRACT
This paper presents the calibration equations of two capacitance probes for monitoring the soil water content in a lysimeter field. Capacitance probes provide readings at desired depths and time intervals. The calibration equations are derived by regression analysis between measurements of scaled frequency and volumetric soil water content. The calibration equations are compared with the manufacturer default equations to estimate the irrigation water depth. The accuracy of capacitance probes in monitoring soil water content increased by using the site-specific calibration equations rather than the manufacturer default equation.
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