Droplets spectrum of air-assisted boom sprayers under different environmental and operational conditions

Sasaki, Robson Shigueaki; Teixeira, Mauri Martins; Fernándes, Haroldo Carlos; Zolnier, Sérgio; Maciel, Christiam Felipe Silva; Alvarenga, Cleyton Batista de

doi:10.1590/1807-1929/agriambi.v20n1p92-96

Cited by 10 publications

(8 citation statements)

References 8 publications

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“…The average number of droplets was lower in the interrow spacing of 0.22 m. The upper third presented the highest average number of droplets in relation to the middle and lower thirds. The lower third, besides having the lowest average number of droplets, presented a value well below those found in other studies for the middle and upper thirds, showing that the adopted application model hinders droplet deposition in the lower third of plants (Table 6), regardless of the application angle and the interrow spacing (Cunha et al, 2014a;Sasaki et al, 2016). Considering the application angles as a function of the third of cotton plants in each interrow spacing, the upper third provided the highest results for the variables DEN, NOD, and COV.…”

Section: Resultsmentioning

confidence: 51%

Droplet Distribution as a Function of Cotton Interrow Spacing and Angles of Sprayer Displacement

et al. 2018

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Application technology factors may be influenced by changes in plant architecture, such as height and leaf area. This study aimed to evaluate which angle of sprayer displacement in the application of pesticides in relation to the direction of cotton sowing, cultivated in the ultra-narrow row, narrow row, and conventional systems, provides the best application quality characteristics in the different thirds of plants. The experiment was installed in a split-plot design with four replications in the 3 × 4 factorial scheme, composed of three cotton cultivation systems and four angles of sprayer displacement in relation to the direction of the sowing rows. The evaluated characteristics were mean volumetric diameter, density and coverage of droplets, number of droplets, and open area in the interrows without leaf. The upper third presented the highest values of mean volumetric diameter, number of droplets, and density and coverage of droplets for all interrow spacing and application angles. The angle of displacement of 30° in relation to the sowing row presented the best results in relation to the number and density of droplets. The spacing of 0.90 m in the interrows increased the number of droplets, droplet density, and coverage in the lower third of plants.

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Section: Resultsmentioning

confidence: 51%

Droplet Distribution as a Function of Cotton Interrow Spacing and Angles of Sprayer Displacement

et al. 2018

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“…This may be because the distance between the nozzle and the target was kept short when spraying, therefore most of the droplets were deposited directly or entered the interior zone with higher velocity. Besides, the droplet VMD of the HS nozzle was 104.4 μm, meaning that the HS was able to produce more very fine droplets 30 under a higher working pressure. Very fine droplets are theoretically more easily carried by the forced air currents of the sprayer, 31,32 thereby improving droplet penetration throughout the tree canopy.…”

Section: Resultsmentioning

confidence: 99%

Deposition and distribution of myclobutanil and tebuconazole in a semidwarf apple orchard by hand‐held gun and air‐assisted sprayer application

Pan

2020

Pest Management Science

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BACKGROUND: Sprayers have been shown in numerous reports to influence pesticide deposition and distribution significantly, and public concern for their potential risk has been increasing in recent years. In this study, a hand-held gun sprayer and two air-assisted sprayers (a conventional axial fan air-blast sprayer and a tower sprayer) were used to apply myclobutanil and tebuconazole, and their influence on pesticide distribution and deposition in a semidwarf apple orchard was systematically investigated. RESULTS: The coefficients of variation of different canopy zones associated with the tower sprayers were 38.9-41.9% for leaves and 35.5-36.4% for fruit, generally lower than the coefficients of variation related to the other two sprayers. Tests conducted using the air-assisted sprayers recorded an overall higher drift on the adjacent rows than experiments carried out with the hand-held gun sprayer. The results of drift in soil indicated that pesticide was mainly distributed within 5 m downwind of the treated area, and the distribution pattern was influenced by sprayer design. The total pesticide concentration deposited in soil within 5 m during application by the tower sprayer was 0.28 m mg kg −1 for myclobutanil and 0.90 m mg kg −1 for tebuconazole, much lower than that of the hand-held gun sprayer and the conventional axial fan air-blast sprayer. CONCLUSION: The results indicate that the tower sprayer gives a more uniform distribution and guarantees better effectiveness for the phytosanitary treatment. The tower sprayer also protected the soil better and reduced environmental pollution due to its scientific structural design.

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“…Application technology of plant protection products is determinant for the success of crops. Phytosanitary control, based on plant protection products, depends not only on product effectiveness but also on the correct mode of application (Sasaki et al, 2016;Cunha et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Droplet Spectra of the Spray Tip Ad 11002 Using Different Techniques

Cunha¹,

Reis

Assunção

et al. 2019

Eng. Agríc.

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Knowledge of droplet spectra generated by spray nozzle tips is important to ensure the quality of applications of plant protection products. However, there are different methods for this evaluation, which can cause difficulty in interpreting the results. This study aimed to evaluate the droplet spectra produced by the flat fan spray tip AD 11002 operated under different pressures and using different techniques and equipment. The volume median diameter (VMD), percentage of spray volume in droplets smaller than 100 µm diameter and relative spam (RS), considering pressures of 200, 300, and 400 kPa were determined using two direct measurement equipment (Spraytec and Shadow Sizer), based on laser diffraction and image analysis, respectively, and a measure based on indirect analysis, through the digitization of water-sensitive paper. Thus, the use of different analysis techniques led to variations of the analyzed parameters. Among the direct measurement equipment, a difference of up to 58% was observed in VMD. The use of water-sensitive paper to characterize droplet spectra must be carried out with great discretion because there is an underestimation of fine droplets. Pressure variations of 200 to 400 kPa did not influence VMD and RS.

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Droplets spectrum of air-assisted boom sprayers under different environmental and operational conditions

Cited by 10 publications

References 8 publications

Droplet Distribution as a Function of Cotton Interrow Spacing and Angles of Sprayer Displacement

Droplet Distribution as a Function of Cotton Interrow Spacing and Angles of Sprayer Displacement

Deposition and distribution of myclobutanil and tebuconazole in a semidwarf apple orchard by hand‐held gun and air‐assisted sprayer application

Evaluation of Droplet Spectra of the Spray Tip Ad 11002 Using Different Techniques

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