| 摘要 |
When the water content is determined, the electric conductivity has an effect on the water content. On the other hand, when the electric conductivity is determined, the water content has an effect on the electric conductivity. Accordingly, even if each characteristic is measured independently, each obtained value includes the error. Contacting a pair of electrodes with soil, applying an alternate current input electric signal to one of the pair of electrodes, comparing a phase of an output electric signal from the other of the pair electrodes with a phase of the input electric signal; and determining the concentration of the ionic solute included in the solvent according to a difference of the phases. The difference of the phases is not dependent on the water content. An electrical conductivity is proportional to a water content and ion concentration, thereby, the water content of soil is available according to the measured electrical conductivity, while determining the ion concentration. |
