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Monday, March 6, 2017

Why tension controlled irrigation is preferable to other soil sensor controllers?

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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