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Key Performance Indicators for Variable Rate Irrigation Implementation on Variable Soils
2009 Reno, Nevada, June 21 - June 24, 2009, 2009Decision support tools for precise irrigation scheduling are required to improve the efficiency of irrigation water use globally. This paper presents a method for mapping soil variability and relating it to soil hydraulic properties so that soil management zones for variable rate irrigation can be defined.
null C B Hedley +3 more
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Analysis of basin irrigation performance with variable inflow rate
Agricultural Water Management, 1982Abstract Basin irrigation systems were designed for a constant flow rate. The operation of the designed system was simulated using the zero-inertia model of surface irrigation. The performance of the system was obtained for modified design flow rates. Three patterns of flow variation — sinusoidal, initially low then high, and initially high then low —
J.Mohan Reddy, Wayne Clyma
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Performance Evaluation of Constant Versus Variable Rate Irrigation
Irrigation and Drainage, 2017AbstractVariable rate irrigation (VRI) can increase water use efficiency and productivity by applying water based on site‐specific needs. In this study, the performance of a five‐span centre‐pivot irrigation system (CPIS) retrofitted with a commercial variable‐rate irrigation package was evaluated at constant and variable application depths at the ...
Aghil Yari +3 more
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Hydraulic performance characterisation of variable rate irrigation technology
2021Variable-rate irrigation (VRI) technology for centre pivots and lateral moves has been commercially available for over three decades, but its uptake has been limited, with growers citing additional capital and operating costs, the detrimental impact on hydraulic and irrigation performance, as key issues.
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Strategy of Energy-saving for Variable-Rate Irrigation Sprinkler
2009 International Conference on Engineering Computation, 2009The energy requirement for variable-rate irrigation sprinkler was analyzed. Boundary equations for triangular irrigation were set up. The relationships between irrigated angle, flow-rate and wetted diameter were included. Based on them, the relationship between flow-rate and variable pressure head for variable-rate irrigation system was obtained ...
Xingye Zhu +3 more
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Effects of Variable-Rate Sprinkler Cycling on Irrigation Uniformity
2004, Ottawa, Canada August 1 - 4, 2004, 2004Field studies with a center pivot (CP) and lateral-move (LM) irrigation systems were conducted to evaluate whether cycling of sprinklers ON and OFF to achieve variable application rates affects the overall application uniformity of an irrigation system. For the CP tests, collector test results showed CUC and DUlq values were 89 or greater with a slight
null Calvin D. Perry +2 more
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Variable-Rate Contour-Controlled Sprinklers for Precision Irrigation
2007 Minneapolis, Minnesota, June 17-20, 2007, 2007The theoretical relationship between several hydraulic performance parameters of variable-rate contour-controlled sprinklers for high uniformity precision irrigation was researched. The operational equation that describes the internal connection of flow rate, rotating speed and throw distance of the variable-rate contour-controlled sprinkler was ...
null Han Wenting +3 more
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Variable rate irrigation in a vineyard and an orchard
Acta Horticulturae, 2021D. Modina +5 more
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Development of Clemson variable-rate lateral irrigation system
Computers and Electronics in Agriculture, 2009Crops in the Southern United States are generally produced in fields which are known to have a high degree of variability in soil type, water holding capacity, infiltration rates, and other major factors which affect crop production. In these fields, the ability to turn irrigation water on or off or apply variably to different segments of the field is ...
Young J. Han +4 more
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Controlling variability in vineyard with variable rate drip irrigation
Acta Horticulturae, 2021openaire +1 more source