Effect of Nozzles, Application Rates, and Adjuvants on Spray Deposition in Wheat Crops

Machado, Willian Alves; Silva, Sérgio M.; Carvalho, Stephan Malfitano; Cunha, João Paulo Arantes Rodrigues da

doi:10.1590/1809-4430-eng.agric.v39n1p83-88/2019

Cited by 11 publications

(15 citation statements)

References 11 publications

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“…According to Vitória et al (2019), the homogeneous droplet spectrum retains a relative amplitude value that tends to zero. The results of the present study indicate that the lowest RA was verified in the aerial treatment using a solution volume of 12 L ha -1 (0.823), and in the terrestrial treatment, with 150 L ha -1 of solution (0.967), using hollow cone spray nozzles, inferring greater homogeneity in droplet formation when compared to the venturi system of hydraulic flat double air induction nozzles (Machado et al, 2019;Huang et al, 2011).…”

Section: Discussionmentioning

confidence: 56%

“…According to Zhang et at. ( 2021), Machado et al (2019) and Madureira et al (2015), the addition of adjuvants can alter application performance. Therefore, the origin of these products and the implications of their use must be known before acquisition and use.…”

Section: Discussionmentioning

confidence: 99%

“…The addition of adjuvants to the spray mix can aid in drift reduction. Numerous types of adjuvants, which operate differently, can be found on the market, and their potential characteristics include improved wetting, spreading, adherence, and leaf penetration (Zhang et al, 2021;Vieira et al, 2018), as well as reduced surface tension of the droplets by enhancing leaf coverage (Song et al, 2020;Machado et al, 2019). However, reported that the addition of adjuvants can alter application performance, and may lead to positive or negative effects regarding product deposition on the target.…”

Section: Introductionmentioning

confidence: 99%

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Spray Deposition on Watermelon Crop in Aerial and Ground Application

Vitória¹,

Alves²,

Rossi³

et al. 2022

JAS

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The quality and quantity production of watermelon requires the effective control of pests, diseases, and weeds, which is directly related to spraying techniques. The method of application of phytosanitary products is essential, but, most of the time, emphasis is given mainly to the applied product and little attention to the application technique. The objective of the present study was to characterize the ejected spray in the aerial and terrestrial spraying of watermelon crops, with the use of adjuvants in a liquid solution. The experiment was carried out in two commercial plantations, in an entirely randomized design, employing a 6 × 2 factorial scheme, with six forms of application and two liquid compositions. The droplet spectrum was assessed employing water-sensitive card imaging. Smaller drop sizes and relative amplitudes were produced by aerial applications. In turn, the largest droplet diameters and the lowest percentage of drops smaller than 100 μm were obtained when using air induction flat double-jet nozzles. The adjuvant did not interfere in the numerical and volumetric median diameters, the relative amplitude, or the volume rate of droplets smaller than 100 μm.

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Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spray Deposition on Watermelon Crop in Aerial and Ground Application

Vitória¹,

Alves²,

Rossi³

et al. 2022

JAS

View full text Add to dashboard Cite

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“…Compared with larger droplets, smaller ones can spread relatively further on the leaf surface and remain relatively longer, thus allowing the active pesticide to penetrate into the leaf tissue more effectively [14,15] . However, small-diameter droplets are more susceptible to drift and evaporation [16] . Air-assisted spraying can improve droplet deposition on a canopy and affect the spray droplet diameter [17] , potentially causing spray droplets to drift [18] .…”

Section: Introduction mentioning

confidence: 99%

Effects of leaf response velocity on spray deposition with an air-assisted orchard sprayer

Li¹,

Li²,

Ma³

et al. 2021

International Journal of Agricultural and Biological Engineering

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The interaction between leaves and airflow has a direct effect on the droplet deposition characteristics of the leaf canopy. In order to make clear the mechanism of droplet deposition in terms of the interaction between the droplets and leaves from the point of the leaf aerodynamic response velocity, the leaf movement under different airflow velocities and the influence of the leaf aerodynamic response on droplet coverage ratio were investigated. The effect of the aerodynamic response velocity of a leaf on the droplet deposition of the leaf surface was investigated. The aerodynamic characteristics of the leaf were analyzed theoretically. Boundary layer theory from fluid mechanics was used to develop a model of the leaf aerodynamic response velocity to nonperiodic excitations based on a convolution integral method. Target leaf aerodynamic velocities were detected using a high-speed camera, and the results indicated that the modeled leaf aerodynamic response velocity matched the measured values. At given conditions of spray liquid and leaf surface texture, the spray test showed that the droplet coverage ratio was influenced by the leaf aerodynamic response velocity, the droplet coverage ratio increased and then decreased with the leaf response velocity. Through analyze four droplets deposition state, the highest droplet deposition ratio and best deposition state on the leaf surface occur when the leaf aerodynamic response velocity was less than 0.14 m/s. According to the analysis of droplet deposition states, the uniformity of the droplet size and quantity distribution of droplets on the leaf surface related to the leaf aerodynamic response velocity. The results can provide a basis for the design and optimization of orchard air sprayers.

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“…The addition of adjuvants to the spray can improve the performance of phytosanitary products and minimize the problems arising from a decrease in the application rate (Cunha et al, 2017;Machado et al, 2019) but may also have no effect, depending on the technique used (Assunção et al, 2019a).…”

Section: Introductionmentioning

confidence: 99%

Multivariate Analysis Applied to Spray Deposition in Ground Application of Phytosanitary Products in Coffee Plants

et al. 2021

Self Cite

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An adequate combination of factors involved in the technology used for phytosanitary product application contributes to an efficient spray deposition on the target. The objective of this study was to use multivariate analysis to characterize the magnitude of effects and the order of influence of three factors that interfere with the quality of phytosanitary product application in coffee plants. An entirely randomized design was adopted, with four repetitions, using a 2 × 2 × 3 factorial scheme, with two classes of droplets quality (fine and coarse), two application rates (250 and 400 L ha -1 ), and the use of adjuvants (with no adjuvant or with Fighter ® and Aureo ® adjuvants). The quality of the application was determined by jointly analyzing the spray deposition on three thirds of leaves, in their internal and external layers, the runoff to soil, coverage, droplet density, relative amplitude, and the volumetric median diameter. The results underwent analysis of variance (ANOVA) to measure the effect sizes (η 2 ). After testing the assumptions of multivariate analysis, clustering and principal component analyses were performed. The class of droplets was found to be the most influential factor in the quality of the phytosanitary product application (spray deposition and runoff to soil). When focusing on spray deposition on leaves, the second-most influential factor was the application rate and the relation between the application rate and the adjuvants. For the other variables, the second-most influential factor was the application rate.

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Effect of Nozzles, Application Rates, and Adjuvants on Spray Deposition in Wheat Crops

Cited by 11 publications

References 11 publications

Spray Deposition on Watermelon Crop in Aerial and Ground Application

Spray Deposition on Watermelon Crop in Aerial and Ground Application

Effects of leaf response velocity on spray deposition with an air-assisted orchard sprayer

Multivariate Analysis Applied to Spray Deposition in Ground Application of Phytosanitary Products in Coffee Plants

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