Tensiometer and Accessory

A tensiometer in soil science is a measuring instrument used to determine the matric water potential (soil moisture tension) in the vadose zone. This device typically consists of a glass or plastic tube with a porous ceramic cup and is filled with water. Such tensiometers are used in irrigation scheduling to help farmers and other irrigation managers to determine when to water. In conjunction with a water retention curve, tensiometers can be used to determine how much to water. Soil tensiometers can also be used in the scientific study of soils and plants.