Abstract
A microprocessor-based controller has been developed to regulate soil water levels under center pivot irrigation systems. Inputs from a rain gauge and soil water sensors placed at two depths at several locations in the field provide information by which control decisions are made. Control algorithms based on soil-water retention curves determine when to begin irrigating the field and the amount of water to apply. A field test was performed and changes to the algorithm are suggested as a result of the test. The controller developed to implement the algorithms consists of a card cage containing both pre-manufactured boards and custom designed circuitry.
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