Abstract
We studied the effectiveness of measuring impedance of soil in the experiments as the method of real time measurement of water content and ion concentration of soil water. We composed an impedance measurement system of a soil column controlled by computers, and made experiments for measuring them at a constant temperature. We concluded that susceptance divided by the angular frequency indicated a water content independent from ion concentration or a soil particle size, and that the further measurement of conductance made it possible to trace the change of ion concentration. We also proposed a simple method to make calibration curves. We think that the measurement method developed in this study is very effective in tracing unsaturated phenomena in a soil column.
