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Description: Uniformity of water application in circular and radial directions under various center-pivot irrigation systems using spray nozzles was recorded in the field on farmer-operated systems. For the eight systems studied, the average application was 15.2 mm and the Christiansen uniformity coefficient values were all above 80%. A computer model was developed to simulate field water application distributions using single sprinkler distributions that had been determined in the laboratory. These distributions were used to predict potential runoff rates under various operating conditions. Simulation showed that it is possible to obtain a high uniformity coefficient with any spray pattern provided the nozzles are spaced properly however, the result may be an application rate that is great enough to produce runoff.

Keywords: application rates and uniformity under center-pivot sprinkler irrigation systems using spray nozzles
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Citation: Thooyamani, K.P., Norum, D.I. and S. Dubetz 1987. APPLICATION RATES AND UNIFORMITY UNDER CENTER-PIVOT SPRINKLER IRRIGATION SYSTEMS USING SPRAY NOZZLES. Canadian Agricultural Engineering 29(2):149-154.
Volume: 29
Issue: 2
Pages 149 - 154
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Date: 1987
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Coverage: Canada
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