Decagon Devices ECH2O EA-10 Integrator Manual
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EA-10 Soil Moisture Sensor Integrator’s Guide3. How the EA-10 Works93. How the EA-10 WorksIn essence, the EA-10 monitors the water budget ofthe soil in which it is placed. It senses water additionand water loss. If the soil is too wet, irrigation can bestopped. If the soil becomes too dry, additional irriga-tion time can be programmed.Proper monitoring of the water budget requires thatthe moisture sensor be located in the active root zoneof relatively homogeneous vegetation, and in well-drained soil of above-average moisture holding capac-ity. Avoid locations where water can run-on or pool,and locations with poor vegetative cover, or wherevegetation tends to water stress because of poor mois-ture holding capacity of the soil or shallow root zone.Vegetation in non-monitored zones will use water at arate proportional to water use in the monitored zone.Water application rates in these zones must thereforebe proportional for the entire system to remain prop-erly irrigated. If trees use 30% more water than turf,and turf is being monitored, then the tree zone needsto be irrigated for 30% more time than the monitoredturf to maintain adequate soil moisture.Since dielectric probes (such as the EA-10) measurethe moisture in the immediate vicinity of the probe, itis essential that the probe be installed so that the entirelength of the probe is in intimate contact with the soil |
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