Viscosity, surface tension and droplet size of sprays of different formulations of insecticides and fungicides

Carvalho, Fernando Kassis; Antuniassi, Ulisses Rocha; Chechetto, Rodolfo Glauber; Mota, Alisson Augusto Barbieri; Jesus, Marcella Guerreiro de; Carvalho, Lídia Raquel de

doi:10.1016/j.cropro.2017.07.014

Cited by 48 publications

(43 citation statements)

References 27 publications

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“…The test was carried out at a temperature of 25±1 °C and relative air humidity of 60 ± 10%. Fifteen droplets were measured per treatment and each droplet considered a repetition (Carvalho et al, 2017). All adjuvant solutions were prepared with deionized water.…”

Section: De Sangosse Agroquímicamentioning

confidence: 99%

“…Afterwards, the leaves were placed in a vertical position (holding the petiole leaves by hand) and the adjuvant aqueous solution was sprayed by a portable micro-sprayer which consisted of a dual action gravity feed airbrush (Sagyma SW -775) with a 0.3 mm tip, pressured by an airbrush compressor (Sagyma ASW-18) at 151.8 kPa, spraying very fine droplets (volumetric median diameter of 32 µm) determined by a VisiSize Portable P15 (Oxford Lasers, Imaging Division, Oxford, U.K.), according to Carvalho et al (2017).…”

Section: Spray Retention Determinationmentioning

confidence: 99%

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Spray Retention on Coffee Leaves Associated With Type and Concentration of Adjuvants

et al. 2019

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Agricultural spray adjuvants (ASA) are widely used in pesticide applications to enhance the performance of pesticides. The aim of this research was to investigate the effects of ASA on static surface tension (SST) and foliar spray retention on coffee leaves. The SST of ASA at different concentrations was determined by the drop weight method. Spray retention on adaxial and abaxial coffee leaf surfaces was performed using a micro-sprayer at solution concentrations of 0, 0.01, 0.1, 0.5, and 1.0% v v-1. The ASA assessed were: polyether-polymethylsiloxane-copolymer (PPC); Nonylphenol ethoxylate; nonyl polyethylene glycol ether; mineral oil; nonylphenoxy polyethoxy ethanol; carboxyl copolymer of styrene and butadiene; primary aliphatic oxyalkylated alcohol plus carboxyl copolymer of styrene and butadiene; and soyal phospholipids and propionic acid. All ASA reduced the SST of the aqueous solutions. PPC provided the best performance in decreasing SST, reaching values below 20 mN m-1 at a concentration of 0.05% v v-1. Spray retention on leaves was influenced by adjuvant type as well as concentration. A very strong positive correlation between SST and spray retention on coffee leaves was observed. Decreasing the SST of the solution provided a reduction of spray retention when spraying was performed until runoff point.

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Section: De Sangosse Agroquímicamentioning

confidence: 99%

Section: Spray Retention Determinationmentioning

confidence: 99%

Spray Retention on Coffee Leaves Associated With Type and Concentration of Adjuvants

et al. 2019

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“…Within application technology, the determination of droplet spectra of a spray has a great influence on the result of an application, being able to estimate the drift, loss to the soil, deposition and target coverage and, consequently, the effectiveness in controlling weeds, pests, and diseases (Guler et al, 2007;Carvalho et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Although some companies that manufacture spray tips disclose in the technical specifications the droplet size ranges as a function of the operating pressures, they are not fixed and can be changed according to the physical characteristics of the spray solution, building machine parameters (air flow), among others (Yan et al, 2017;Carvalho et al, 2017;Carvalho et al, 2018).…”

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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“…For this method, the characterization is carried out in real time by Visisize Particle Sizing software, developed by the same equip ment manufacturer. The system analyzes the droplet spectrum using a technique called Particle/Droplet Image Analysis (PDIA) (Carvalho et al, 2017). The system is capable of measuring droplets with diameter above 5 μm.…”

Section: Materials and Met Hodsmentioning

confidence: 99%

Spectrum and Velocity of Droplets of Spray Nozzles With and Without Air Induction

2018

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The aim of this study was to evaluate the spectrum and the velocity of droplets produced by nozzles with and without air induction, under different pressures and flow rates. The experiment was conducted in a completely randomized design with five replications, in a factorial 2 x 3 x 3 (two spray nozzles, three flow rates and three operating pressures). The spray nozzles with and without air induction of the Hypro manufacturer (GA and VP) were evaluated, with nominal flow rates of 0.76; 1.14 and 1.51 L min -1 and pressures of 200, 300 and 400 kPa. The spectrum and velocity of the droplets were determined directly, using a Visisize Portable P15 (Oxford Lasers, Imaging Division). The pressure increases further reduction of the VMD and the relative amplitude, and increases the droplet velocity. The droplets generated by the spray nozzles with air induction showed on average amplitude 1.54 times higher than the droplets generated by spray nozzles without air induction. The droplet velocity showed little variation between the nozzles with and without air induction with the same pressure and flow rate, however, spray nozzles with larger flow rates and pressures produced droplets with higher velocities.

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Viscosity, surface tension and droplet size of sprays of different formulations of insecticides and fungicides

Cited by 48 publications

References 27 publications

Spray Retention on Coffee Leaves Associated With Type and Concentration of Adjuvants

Spray Retention on Coffee Leaves Associated With Type and Concentration of Adjuvants

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

Spectrum and Velocity of Droplets of Spray Nozzles With and Without Air Induction

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