Sprayer Speed and Venturinozzle Effects on Broadcast Application Uniformity

Womac, A. R.; Etheridge, Robert E.; Seibert, A. Frank; Hogan, Donald; Ray, Subhabrata

doi:10.13031/2013.7011

Cited by 29 publications

(23 citation statements)

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“…The coefficient of variation in the deposits were 74.3 % and 56 % for the nozzles in the hexagonal curved spray boom with 72.50 cm side length boom A and the hexagonal curved spray boom B, respectively. This coefficient of variation was even higher than that of 5 % to 17 % for static boom as well as of 6 % to 37 % for moving (at 6 to 26 km h -1 ) boom as reported by Womac et al (2001) and Lardoux et al (2007). The side length of spray boom and nozzles overlap influenced the coefficient of variation in the deposits.…”

Section: Resultsmentioning

confidence: 67%

New mechanized system for circle spraying of oil palms seedling emergence

Pebrian

Yahya

2012

Sci. agric. (Piracicaba, Braz.)

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ABSTRACT:, A new machine system has been designed, developed and evaluated for extensive circle spraying of oil palms (Elaeis guineensis Jacq.) in an effort to overcome the inefficient spraying problem with the conventional spraying system. The machine system consists of a four-wheeled drive 4WD prime mover with front mounted machine attachments for the circle spraying operation.The configuration of the circle spraying attachment consists of a hexagonal curved spray boom, lifting arm, opening-tilting mechanism unit, storage tank, spray pump, solid cone nozzles, and associate hydraulic system. Field performance tests on the machine system showed an average effective field capacity of 7.89 ha per man per day and when compared to the earlier reported effective field capacity of the walking spray-operated equipment using Serena LT16 knapsack sprayer; a difference of 1.97 time for circle spraying of mature palms grove. Reduction in the human energy expenditure of 101.28 kJ man -1 h -1 or 10.68 % but an increase in the spraying cost of 1.53 USD ha -1 or 24.9 % were obtained with the machine system against the walking spraying-operated equipment using Serena LT16 knapsack sprayer. Justification for machine system to be cost effective could be satisfied if the present effective field capacity is increased to 1.263 time with good skilled operator or if the current R&D cost is reduced to 0.41 time. This is because the improved field capacity of new machine system could not rationalize its current R&D cost. Admittedly, the machine system has great potential to overcome the limitations with the current employed machine/ equipment in the circle spraying operation of oil palms in the plantation.

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Section: Resultsmentioning

confidence: 67%

New mechanized system for circle spraying of oil palms seedling emergence

Pebrian

Yahya

2012

Sci. agric. (Piracicaba, Braz.)

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“…The result implies that the large droplet statistic, D V0. 9 , should consider as a least significance aspect to determine the spray droplet size classification of the XR nozzles because the size variations by operating condition The nozzle classifications from droplet size measurement results of the instrument were well matched with the manufacture's classification. One disagreement was found with the medium size nozzle, and the incorrect classification was caused by the D V0.9 statistic of the spray droplet spectrum: the D V0.9-nozzle classification disagreement in our test was likely a casual result due to randomly captured big droplets rather than an issue in the instrument's size measurement.…”

Section: E Droplet Size Measurement and Nozzle Classificationmentioning

confidence: 80%

“…An average cumulative volume statistics were identified for each nozzle: VMD, D V0.1 and D V0. 9 . The distance between the nozzle outlet and the center of the camera was approximately 340 mm.…”

Section: E Droplet Size Measurement and Nozzle Classificationmentioning

confidence: 99%

“…Furthermore, a droplet size spectrum of a spray nozzle is a preliminary factor to understand the behavior of spray application pattern (Jeon et al, 2004;Womac et al, 2001). As the concerns on pesticide application grow, selecting proper spray nozzles for different pesticide applications becomes more important because otherwise, improper application or unintended results may occur from the application.…”

Section: Introductionmentioning

confidence: 99%

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Machine Vision Instrument to Measure Spray Droplet Sizes

Jeon¹,

Tian²

2010

Journal of Biosystems Engineering

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A machine vision-based instrument to measure a droplet size spectrum of a spray nozzle was developed and tested to evaluate its accuracy on measuring spray droplet sizes and classifying nozzle sizes. The instrument consisted of a machine vision, light emitting diode (LED) illumination and a desktop computer. The illumination and machine vision were controlled by the computer through a C++ program. The program controlled the machine vision to capture droplet images under controlled illumination, and processed the droplet images to characterize the droplet size distribution of a spray nozzle. An image processing algorithm was developed to improve the accuracy of the system by eliminating random noise and out-of-focus droplets in droplet images while measuring droplet sizes. The instrument measured sizes of the three different balls (254.0, 497.8 and 793.8 µm) and the measurement ranges were 241.2-273.6 µm, 492.9-529.6 µm and 800.8-824.1 µm for 254.0-, 497.84-and 793.75-µm balls, respectively. Error of the measured droplet mean was less than 3.0 %. Droplet statistics, DV0.1, DV0.5 and DV0.9, of a reference nozzle set were measured, and droplet size spectra of five spray nozzles covering from very fine to extremely coarse were measured to classify spray nozzle sizes. Ninety percent of the classification results of the instrument agreed with manufacturer's classification. A comparison study was carried out between developed and commercial instruments, and measurement results of the developed instrument were within 20 % of commercial instrument results.

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“…Ooms et al (2002) equipped the boom with ultrasonic sensors and accelerometers to measure horizontal movements, the sprayer being equipped with a radar speed sensor and a three-axis dynamic measurement unit. The effects of nozzle height, forward speed and nozzle type on spray pattern were studied in field conditions by Womac et al (2001). The coefficient of variation (CV) of spray distribution ranged from 5 to 17% for static booms and from 6 to 37% for moving (at 6 to 26 km/h) booms.…”

Section: Introductionmentioning

confidence: 99%

Test Method for Boom Suspension Influence on Spray Distribution, Part I: Experimental Study of Pesticide Application under a Moving Boom

Lardoux

Sinfort

Enfalt

et al. 2007

Biosystems Engineering

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The quality of pesticide spraying depends on boom movement. A conveyor with a shaking platform was built to analyse the influence of boom movements on spray distribution. It is able to generate uniform translations and rotational movements of a small boom under laboratory conditions. The overall ground spray distributions were studied using image analysis. Suitable representations and mathematical tools were considered to analyse the unevenness of ground spray distributions and to compare accurately spray patterns. The effects of boom height, boom speed and nozzle type on dynamic spray distributions were analysed and compared with stationary distributions. The effects of yaw and roll movements were also considered. Measurements of droplet size and velocity made with a phase Doppler analyser were added to complete the dynamic effect study. Tests were repeatable but some fluctuations were obtained when boom height increased. Static and dynamic distributions Author-produced com -doi:10.1016/j.biosystemseng.2006.08.014 2 have the same overall unevenness but this unevenness is more important in dynamic conditions due to turbulence effects. Roll and yaw increase unevenness. For roll movements, changes in nozzle heights explain the variations. For yaw movements, over-dosed areas are observed where the nozzles have a small horizontal velocity.version of the article published in Biosystems Engineering, 96(1), 29-39. Original publication available at www.elsevier.

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Sprayer Speed and Venturinozzle Effects on Broadcast Application Uniformity

Cited by 29 publications

References 0 publications

New mechanized system for circle spraying of oil palms seedling emergence

New mechanized system for circle spraying of oil palms seedling emergence

Machine Vision Instrument to Measure Spray Droplet Sizes

Test Method for Boom Suspension Influence on Spray Distribution, Part I: Experimental Study of Pesticide Application under a Moving Boom

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Sprayer Speed and Venturinozzle Effects on Broadcast Application Uniformity

Cited by 29 publications

References 0 publications

New mechanized system for circle spraying of oil palms seedling emergence

New mechanized system for circle spraying of oil palms seedling emergence

Machine Vision Instrument to Measure Spray Droplet Sizes

Test Method for Boom Suspension Influence on Spray Distribution, Part I: Experimental Study of Pesticide Application under a Moving Boom

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Sprayer Speed and Venturinozzle Effects on Broadcast Application Uniformity