Soil sensor probes are relatively cheap, require minimum maintenance and can
be automated for feedback irrigation but they have to be calibrated for water
content. Calibration is specific for the substrate (soil type, soil-less media) and
some of them are affected by temperature and salinity. In contrast, soil water
tension does not require calibration and it is not affected by salinity and
temperature. Furthermore, the water movement in the soil-plant- atmosphere
continuum is governed by tension difference. Soil water tension, plant water
tension and plant photosynthesis are directly related. Soil water tension is
therefore a direct measurement of plant performance, contrary to indirect
measurements by other soil sensor.
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