The IrriSave™ control system

In the present IrriSave™ system, developed by C.I.T., an estimate of how much to
irrigate is obtained by the use of a feedback loop based on real time measurements of the positions of the wetting and drainage fronts during and following irrigation.
The optimal amount of water per irrigation is defined as the amount of water to be applied in order that the drainage front would reach the bottom of the root zone at the practical end of the drainage process.
In simpler terms, the optimal amount of water to apply is defined as the amount of water needed to rewet the root zone depth to the water content at field capacity, established at the practical end of the drainage process.
The time to start irrigation is determined on the basis of the relative decrease in the amount of soil water extracted from the most active depth of the root zone since last irrigation.
Irrigation is terminated when the advancing wetting front reaches the sensor located at the target depth.
The target depth is defined as the depth of arrival of the wetting front where irrigation should be stopped so that the drainage front would come to a practical stop at the bottom of the rooting zone.

 
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