Performance of the capacitive moisture sensor under different saline conditions

Resumo

Capacitive methods for determining soil moisture are extremely practical and easily applied in the agricultural
environment, but are influenced by temperature, salinity and the type of soil. In this study, the aim was to verify the performance
of the Capacitive Moisture Sensor for Porous Media when subjected to saline media. The sensor under evaluation was
developed at the Federal University of Ceará, and provides measurements and electrical frequencies related to soil moisture.
The capacitive sensor for porous media was subjected to saline solutions with different concentrations of potassium chloride
(KCl), when it was seen that the sensor electrodes appear sensitive to salinity when inserted in saline aqueous solutions with
an electrical conductivity of up to 4 dS/m. Adjustments to the RC (resistor-capacitor) circuit were tested as an alternative to
lessen the effect of salinity on the measurements, and it was possible to generate readings related to soil moisture in electrical
frequencies ranging from kHz to MHz. Tests were then carried out in a sandy soil under different conditions of moisture and
salinity. No significant differences were seen when using different resistors in the RC circuit that was constructed to lessen the
effects of salinity on the measurements taken by the sensor, whether in solution or in the soil.