Basic principles of the IrriSave™ control system

Objectives of irrigation

  1. Control of the level of water stress in the crop – Timing – time to start.
  2. Apply the amount of water consumed by the crop since last irrigation – Amounts – time to stop.
  3. Leach excess salts out of root zone volume.
  4. Carry plant nutrients into the soil.

Principles of our intelligent irrigation control

  • Need of feedback loops and dedicated sensors.
  • For objective 1 – Physiological sensors.
  • For objective 2 – Soil Water sensors.
  • Separate objective 1 from objective 2 and set order of preference.
  • Base control on dynamic processes

Characteristics of the intelligent irrigation control system

  • Objective 2 is the first preference.
  • Soil water sensors and appropriate algorithms capable of identifying the passage of wetting and drainage fronts.
  • Algorithms to track the position of the fronts in real time.
  • A learning feedback loop to estimate the next location of the wetting front, ZI, to stop irrigation.
  • Stop irrigation when the wetting front reaches the estimated stopping depth, ZI.
  • Start irrigation when the sensor at depth of maximum root activity records a predetermined relative change, representing a threshold value of soil water extraction by the roots.
 
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