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Selecting Sprinkler Packages for Center Pivots
5th National Decennial Irrigation Conference Proceedings, 5-8 December 2010, Phoenix Convention Center, Phoenix, Arizona USA, 2010Abstract: Center pivots are the primary method of irrigation across the Great Plains. Center pivot irrigation is also the fastest growing method of irrigation in the United States and around the world. Pivots have the potential to be very efficient and uniform if sprinkler devices are properly selected for local field conditions.
Martin, Derrel L. +3 more
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CENTER-PIVOT AUTOMATIZATION FOR AGROCHEMICAL USE
IFAC Proceedings Volumes, 2002Abstract This paper presents an agrochemical application system that could be incorporated to existing irrigating center-pivots. The system consists in a hydraulic circuit with emitters dose controlled with variable valve timing. The electronic control system has been designed to be modular and distributed along the pivot with a main algorithm based ...
J. Palacín +4 more
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Center-pivot automatization for agrochemical use
Computers and Electronics in Agriculture, 2005This paper presents an agrochemical application system that could be incorporated into existing irrigating center-pivots. The system consisted of a hydraulic circuit with emitters, where the dose was individually controlled with variable valve timing. This paper describes the electronic control system, designed to be modular and distributed along the ...
Palacín Roca, Jordi +5 more
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Using Center Pivots for Research
Journal of Irrigation and Drainage Engineering, 1988Research to determine crop water-production functions normally involves random block designs or a line sprinkler source. Both of these setups have disadvantages that can largely be overcome by using modified center pivots. The otraveling tricklero center-pivot modification uses a series of small adjustable emitters (tricklers) to apply water.
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The Pivotal Role of the Academic Health Center
Health Affairs, 1994Academic health centers (AHCs) now play major roles in the development, adoption, and evaluation of medical technologies; the provision of advice to other entities involved in medical innovation; and the education of current and future practitioners. However, recent and potential health care reform initiatives could make it increasingly difficult for ...
G, Anderson, E, Steinberg, R, Heyssel
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Conserving Energy with Low-Pressure Center Pivots
Journal of the Irrigation and Drainage Division, 1980Reduced-pressure, center-pivot irrigation systems offer the potential of applying irrigation water with significant energy savings. However, lowering the pressure of center-pivot systems may increase runoff and soil erosion, thereby reducing irrigation efficiency, decreasing uniformity of water application, and creating other operational problems.
James R. Gilley, Lloyd B. Mielke
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Friction Correction Factors for Center-Pivots
Journal of Irrigation and Drainage Engineering, 1999Analytical equations for friction correction factors for center-pivot laterals without end guns are developed. This work illustrates a discrepancy when earlier equations are applied to center-pivots with small numbers of outlets. Earlier equations were also limited to center-pivots with constant outlet spacing.
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Performance of Low Pressure Center Pivot Systems
Transactions of the ASAE, 1984ABSTRACT A computer simulation model was used to compare the effect of sprinkler spacing and terrain on the theoretical performance of six center pivots. Systems with impact sprinklers and low pressure fixed head spray sprinklers had the highest uniformities for constant spacings of 12 and 1.5 m, respectively.
null L. G. James, null S. K. Blair
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Center Pivot Design Capacities in Eastern Colorado
Journal of the Irrigation and Drainage Division, 1974Design system capacities were developed for center pivot sprinklers irrigating corn in the Central Great Plains by simulating irrigations for 60 yr of climatic data collected at Akron, CO. The modified Penman equation for estimating potential ET for alfalfa as a reference crop was calibrated with lysimeter and meteorological data collected at the ...
Dale F. Heermann +2 more
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Power Sources for Center Pivot Irrigation
SAE Technical Paper Series, 1977<div class="htmlview paragraph">The development of the center pivot irrigation system has allowed a level of process control not previously attainable in commercial agriculture. This form of irrigation now forms the dominant method for new lands going under irrigation.</div> <div class="htmlview paragraph">Consideration of alternative
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