In contrast resistive soil moisture tensiometers like the Watermark®
soil moisture sensors are responsive to soil potentials in excess of
−200 kPa. We decided to use Watermark® sensors because of their
low cost, ease-of-use, and because they are widely used by the agricultural
community for scheduling irrigation. Some researchers have evaluated
Watermark® sensors and found them to respond well to the
wetting and drying cycles for most soil types