Effects of charging voltage, application speed, target height, and orientation upon charged spray deposition on leaf abaxial and adaxial surfaces

Maski, Devanand; Durairaj, Divaker

doi:10.1016/j.cropro.2009.10.006

Cited by 60 publications

(53 citation statements)

References 26 publications

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“…Other studies have achieved promising results using lower spray volumes on tree crops (BALAN et al, 2006;FERNANDES et al, 2010). Additionally, electrostatic spraying at lower volumes can improve leaf deposition and reduce drift losses (ZHAO et al, 2008;MASKI;DURAIRAJ, 2010). Some studies have demonstrated the advantages of electrostatic sprayers (MASKI;DURAIRAJ, 2010;DERKSEN et al, 2007;LARYEA;XIONGKUI et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, electrostatic spraying at lower volumes can improve leaf deposition and reduce drift losses (ZHAO et al, 2008;MASKI;DURAIRAJ, 2010). Some studies have demonstrated the advantages of electrostatic sprayers (MASKI;DURAIRAJ, 2010;DERKSEN et al, 2007;LARYEA;XIONGKUI et al, 2011). Sasaki et al (2013) evaluated a pneumatic backpack sprayer and also showed that the electrostatic system was efficient for spraying coffee plants.…”

Section: Introductionmentioning

confidence: 99%

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Spray deposition on coffee leaves from airblast sprayers with and without electrostatic charge

et al. 2015

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ABSTRACT:Studies on the quality of applications of plant protection products on coffee crops are lacking. Thus, we studied spray deposition on coffee leaves and losses to the soil from hydropneumatic spraying at different spray volumes and with and without an electrostatic charge. The experiment was set up using randomized blocks in a factorial design (4 x 2 + 1). Spray deposition on the upper, middle and lower parts of the canopy and losses to the soil were evaluated using Brilliant Blue tracer. Applications were made at 200, 300, 400 and 500 L ha -1 with a conventional airblast sprayer (axial fan type) and an airblast sprayer with directed air jets. Applications were also made with an electrostatic sprayer at 130 L ha -1 . Electrostatic spraying resulted in greater spray deposition on the lower part of the coffee canopy compared to non-electrostatic spraying. On the lower and middle parts of the plants, the sprayer equipped with directed air ducts performed better than the sprayer with nozzles arranged along the lateral arcs (axial). The spray volume of the airblast sprayers without electrostatic charge (200 to 500 L ha -1 ) did not influence spray deposition on the plant leaves and losses to the soil, which were lower with the electrostatic sprayer.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spray deposition on coffee leaves from airblast sprayers with and without electrostatic charge

et al. 2015

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“…Number or weight concentration per unit area on the rear side is close to that of the front side (i.e. frontto-rear side deposition ratio is 1:1) [16] as q m increases up to 5 mC/kg. However, our experimental data did not follow the trend; the total number concentrations of the deposited particles on the front and rear sides are estimated to be 5.4 and 2.7 numbers/µm 2 , respectively, resulting in the ratio of 2:1.…”

Section: −23mentioning

confidence: 99%

“…Zhao et al [15] also concluded that the electrostatic effect can enhance the both-side deposition with high number of the charge-to-mass ratio. In an experimental study using 100-µm charged particles [16], the both-side deposition has shown that the deposition rate of the approaching particles on the front side of a substrate decreased with increasing the charge-to-mass ratio. Number or weight concentration per unit area on the rear side is close to that of the front side (i.e.…”

Section: −23mentioning

confidence: 99%

Simultaneous Deposition of Submicron Aerosols onto Both Surfaces of a Plate Substrate by Electrostatic Forces

Gen

Ikawa

Sagawa

et al. 2014

e-J. Surf. Sci. Nanotechnol.

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We demonstrate one-step deposition of submicrometer-sized particles suspended in the gas-phase onto a plate type substrate using an electrostatic-assisted spray system. The spray nozzle was set perpendicularly to the substrates (facing the front surface). The particles were deposited on plate-type metallic surfaces, on both front and rear sides of the substrate. This "both-side" deposition can be ascribed to deflection of charged particles in the front side, and then drifting of the particles around the rear side. A numerical simulation also showed that the deposition mechanism was found to be dependent on the center and the edge of the substrate. The electrostatic effect is more effective on both the center and the edge than the diffusion effect.

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“…Drift is recognised as being the most important source of diffuse environmental contamination caused by pesticide application (Jong et al, 2008;Maski & Durairaj, 2010). ISO Standard 22866 defines spray drift as the quantity of plant protection product that is carried out of the sprayed (treated) area by the action of air currents during the application process (ISO, 2005).…”

Section: Introductionmentioning

confidence: 99%

Description of the airflow produced by an air-assisted sprayer during pesticide applications to citrus

Salcedo¹,

Garcerá²,

Granell³

et al. 2015

Span. j. agric. res.

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Atmospheric drift of plant protection products is considered a major source of air pollution during pesticide applications. Citrus protection against pests and diseases usually requires application of these products using air-blast sprayers. Many authors have emphasized the influence of vegetation on the risk of spray drift. The aim of this work was to describe in detail how the airflow from an air-blast sprayer behaves when it reaches citrus trees and, in particular, the effect that the tree canopy has on this flow. Tests were conducted at a commercial citrus orchard with conventional machinery, placed parallel to a row of trees. Air velocity and direction was measured using a 3D ultrasonic anemometer in 225 points situated in three parallel planes perpendicular to the equipment. The stability of the airflow at each measuring point was studied and the mean velocities were graphically represented. Two vortexes, one behind the canopy, and another over the tree, have been deducted and never been reported before. Both may have an important influence on the trajectories of the sprayed droplets and, as a consequence, on the way in which plant protection products are diffused into the atmosphere. Observed turbulence intensities were higher than in similar experiments conducted in other tree crops, which may be attributable to the higher air volume generated by the machinery used for citrus protection and to the higher foliage density of citrus orchards.

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Effects of charging voltage, application speed, target height, and orientation upon charged spray deposition on leaf abaxial and adaxial surfaces

Cited by 60 publications

References 26 publications

Spray deposition on coffee leaves from airblast sprayers with and without electrostatic charge

Spray deposition on coffee leaves from airblast sprayers with and without electrostatic charge

Simultaneous Deposition of Submicron Aerosols onto Both Surfaces of a Plate Substrate by Electrostatic Forces

Description of the airflow produced by an air-assisted sprayer during pesticide applications to citrus

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