Soil Moisture Sensor
Why measure: This sensor measures soil moisture (volumetric water content) and soil temperature. These measurements are taken at different depths to better understand the dynamics of soil storage. Changes in soil water storage over time indicate wetting and drying periods throughout the year and are an important part of the overall water balance . Soil temperature readings indicate if soils are frozen, which significantly affects water movement on the soil surface.
The Decagon Devices ECH2O water content/temperature sensor measures the dielectric permittivity of soil to determine water content. Temperature is measured using a thermistor which is attached to the probe prongs. Both soil moisture and temperature are output digitally.