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Center pivot irrigation system modification to provide variable water application depths
- A multiple-segment water application system was developed and attached to a commercial center pivot irrigation system to provide variable application depths within each segment at a given speed. Each segment was 9.15 m (30ft) long and consisted of three parallel manifolds sized to provide 1x, 2x, and 4x, where x is a minimum application depth. The three manifolds could be operated individually or in various combinations to provide eight application rates (0-7x) at any given tower velocity. Water application depth varied from 0 to 12.4 mm (0 to 0.5 in.) when the center pivot was moving at 50% of full speed. Water was delivered via industrial, full-cone, and wide angle spray nozzles that were selected to provide the desired range of application depths for the entire length of the pivot. The irrigated areas for each angular increment were small at the pivot end of the system and required nozzles with small discharge rates while at the distal end the areas were larger required nozzles with larger discharge rates. Agricultural chemicals, especially nutrients, that can be injected into the irrigation water may also be applied at the same range of rates provided the chemical concentration is constant.
Omary, M. , Camp, C.R. , Sadler, E.J.
center pivot irrigation , irrigation water , irrigation systems , design , nozzles , application rate , variable rate application , precision agriculture
- Includes references
- Applied engineering in agriculture Mar 1997. v. 13 (2)
Journal Articles, USDA Authors, Peer-Reviewed
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.