Effect of Frequency on Center Pivot Irrigationby Derrel Martin, Nebraska-Lincoln, Lincoln, United States,
Abstract: Processes that are affected by the irrigation frequency of center pivot irrigation systems are described. High frequency irrigation will increase evaporation from crop canopies and unshaded soils, while it generally reduces runoff losses. Other processes such as evaporation of droplets in the air, drift of droplets downwind and evaporation from soils shaded by a complete canopy are not substantially affected by increasing the frequency of irrigation. Currently models are not available to simulate these processes for an entire field.
Subject Headings: Evaporation | Irrigation systems | Canopies | Crops | Runoff | Simulation models
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