If soil moisture is less electrical resistance in the ground will be much. The received voltage is less soil moisture, but if there are a lot of electrical resistance in the soil will be less. The voltage measured is very value.
If the soil contains less moisture The electrical resistance of the soil to much. Voltage gain is less. But if the soil has more moisture in the soil resistivity is less. Voltage measurements are very valuable.
If the soil moisture content in the soil, little resistance, the pressure gets less. But if the soil moisture resistance in soil are smaller. The pressure was measured to have much value.