Definition:
An instrument used to measure the matric potential (sometimes called the soil moisture retention curve and/or desorption curve). Tensiometers operate by allowing the soil solution to come into equilibrium with a reference pressure indicator through a permeable ceramic cup placed in contact with the soil.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO-SAFR, 2002, Irrigation Manual Module 1, Irrigation Development: a Multifaceted Process, By: Andreas Savva & Karen Frenken