Simulation of Variable Water Application with Linear-move Irrigation Systems

Fraisse, Clyde W.; Heermann, Dale F.; Duke, Harold R.

doi:10.13031/2013.27960

Cited by 22 publications

(12 citation statements)

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“…Others have used simulation models and have compared results to measured values. Fraisse et al (1995) simulated variable water application of a LM site-specific irrigation system under various water application rates (pulsing) conditions. Field evaluations were carried out to verify simulation results.…”

Section: Introductionmentioning

confidence: 99%

A remote irrigation monitoring and control system (RIMCS) for continuous move systems. Part B: field testing and results

et al. 2009

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Precision irrigation systems can have inherent errors that affect the accuracy of variable water application rates controllers, as well as affect the controllers' performance when evaluated on different continuous move irrigation systems configurations. The objective of this study was to assess the performance of a remote irrigation monitoring and control system (RIMCS) installed on two separate linear move (LM) irrigation systems. The RIMCS varies water application rates by pulsing nozzles controlled by solenoids connected via relays to a single board computer (SBC) with wireless Ethernet connection to a remote server. The system also monitors irrigation system flow, pressure, position and wireless field sensor networks. The system was installed on a LM irrigation system in Prosser, Washington, USA and on a LM in the Nesson Valley of North Dakota, USA. For the LM at Prosser, four pre-defined irrigation patterns were imposed and variable rates were applied as a percentage of the nozzle base application rate. Each nozzle was pulsed across the span length and along the LM travel direction. For the LM at the Nesson Valley, a quadratic pattern was imposed pulsing banks of nozzles along the LM travel direction. Standard catch can tests were performed and the system performance was evaluated by comparing measured catch can water depths with pre-determined target values. The RIMCS accuracy was found to be in the range of the LM uniform water depth application uniformity coefficients of 88-96%. The RIMCS was successfully transferred to another LM in North Dakota as indicated by the relatively low variable rate application errors of -8.8 ± 8.1% and -0.14 ± 6.7% for the two spans.

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Section: Introductionmentioning

confidence: 99%

A remote irrigation monitoring and control system (RIMCS) for continuous move systems. Part B: field testing and results

et al. 2009

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“…The experiments resulted in a positive assessment as regards the implementation of precision farming in the management of irrigation (Sadler et al 2002). Fraisse et al (1995) simulated variable rate irri-(1995) simulated variable rate irrigation with a subsequent verification of the results in practice.…”

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Evaluation of efficiency of precision irrigation for potatoes

Jobbágy¹,

Simoník²,

Findura³

2011

Res. Agric. Eng.

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Jobbágy J., Simoník J., Findura P., 2011. Evaluation of efficiency of precision irrigation for potatoes. Res. Agr. Eng., 57 (Special Issue): S14-S23.The objective of the presented paper was to verify in practice the methods of precision irrigation, defined theoretically, under the employment of reel hose irrigation machines. The surface area of the field was 22 ha. The basic soil hydrological coefficients were measured in 19 monitoring points, specifically the field capacity and the wilting point. The field capacity ranged between 28.83% and 32.11% by vol., and the wilting point was in the interval between 8.40% and 12.40% by vol. At the conclusion, the soil moisture as a factor decisive for determining the irrigation rate was measured in these monitoring points. The irrigation rate ranged from 0 to 40 mm for the specific date of the soil moisture determination. During the whole growing season, five irrigation rates were applied according to the principles of precision irrigation. As compared to conventional water application, precision irrigation contributed to water saving in the amount of 478.56 m 3 /ha. The electric power saving reached 249.68 kWh/ha. The cost saving was characterised by the value of 9.1 EUR/ha and this represented 23.8%. The results have shown that precision irrigation is a fully effective system of precision farming, although the procurement and implementation of new technology and software requires at first a significant financial cost. There is also an increased need for the education and skills of the operating staff.

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“…Center pivot and linear-move irrigation systems provide a natural platform upon which to develop site-specific irrigation management technologies due to their current and increasing usage, large area of coverage, and relatively high degree of automation. Site-specific irrigation management hardware and control systems have been reported in the literature (Fraisse et al, 1995;King et al, 1996;Sadler et al, 1996;Evans et al, 1996;Harting, 1999;Perry et al, 2003). In each case, spatially variable water application was successfully achieved on a limited scale.…”

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Field Testing of a Variable Rate Sprinkler and Control System for Site-Specific Water and Nutrient Application

King¹,

Wall²,

Kincaid³

et al. 2005

Applied Engineering in Agriculture

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ABSTRACT. Development / nterest in site-specific irrigation management has risen over the past decade due in part to compliment successful commercialization of other site-specific management technologies and the fact that both deficit and excess water availability greatly impact crop yield and quality. Center pivot and linear-move irrigation systems provide a natural platform upon which to develop site-specific irrigation management technologies due to their current and increasing usage, large area of coverage, and relatively high degree of automation. Site-specific irrigation management hardware and control systems have been reported in the literature (Fraisse et al., 1995;King et al., 1996;Sadler et al., 1996;Evans et al., 1996;Harting, 1999;Perry et al., 2003). In each case, spatially variable water application was successfully achieved on a limited scale. However, with each successful implementation, one common impediment was the lack of a variable rate sprinkler to facilitate spatially variable water application. King and Kincaid (2004) linear-move irrigation systems. Variable sprinkler flow rate is achieved by cycling a retractable concentric pin into the sprinkler nozzle orifice to provide a time-averaged variable flow rate over a range of 36% to 100% in flow for a particular nozzle size. The application pattern radius of the variable rate sprinklers tested was reduced roughly 15% under variable flow conditions. This suggests that application uniformity should be comparable to conventional sprinklers on center pivot and linear-move irrigation systems over an application rate range of 36% to 100%. The objective of this study was to implement a control system algorithm for individual sprinkler control and test the variable flow rate sprinkler on a three-span linear-move irrigation system to evaluate water application uniformity and application of spatially varied target amounts of water and chemical under field conditions. MATERIALS AND METHODS IRRIGATION SYSTEMThirty-two of the Prototype II variable rate sprinklers ( fig. 1) described by King and Kincaid (2004) were constructed. The selected concentric pin size was 4.76 mm (3/16 in.) in combination with a straight-bore brass nozzle size of 5.95 mm (15/64 in.) to theoretically provide a 36% to 100% range in flow from the variable rate sprinkler due to change in orifice area, assuming constant nozzle pressure. Pulse width modulation (PWM) refers to modulation of voltage on-and off-times over a specified time period. A 1-min time period was used in this study. A 10% duty cycle means that the voltage on-time is 10% of the specified time period, 6 s in this case. Thus, by specifying a duty cycle of 0 to 100%, the control system energized the solenoid to insert the concentric pin in the nozzle bore 0 to 100% of the time, which was repeated at 1-min intervals. The prototype sprinklers were installed on a three-span 100-m (327-ft) linear-move system located at

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Simulation of Variable Water Application with Linear-move Irrigation Systems

Cited by 22 publications

References 0 publications

A remote irrigation monitoring and control system (RIMCS) for continuous move systems. Part B: field testing and results

A remote irrigation monitoring and control system (RIMCS) for continuous move systems. Part B: field testing and results

Evaluation of efficiency of precision irrigation for potatoes

Field Testing of a Variable Rate Sprinkler and Control System for Site-Specific Water and Nutrient Application

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