Tensiometer

Term (tension = tension of gases and vapours, pressure) for a device for measuring soil moisture using suction tension or soil water tension (energy ratios in pore water). The drier a soil, the greater the potential of adsorption (ability of solids to attract and accumulate gases or dissolved particles on their surface) and capillary forces (force that makes liquids rise upwards against gravity; in plants this takes place in the fine tubes in the conductive tissue) that bind the water in the soil. In agriculture and horticulture, tensiometers are used in the automation of irrigation systems. The amount of water can be controlled so that the plants are optimally supplied with water without water and nutrients being washed out into the subsoil.

Tensiometer - Graphik

For the planting and care of the vines, it is important to know the root zone. The instrument is used to test the soil strength; it can be used to detect localised soil compaction. These firm areas are then loosened to facilitate root development. A sufficient supply of nutrients is only possible in a loose soil type. The picture shows a tensiometer with (1) porous ceramic cell, (2) water-filled sight glass, (3) electronics, (4) pressure sensor. See also under irrigation, monoculture and water storage capacity.

Picture: By unknown, public domain, link
Source: WIKIPEDIA Tensiometer

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Tensiometer

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