Programa de Pós-Graduação em Agronomia

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Navegando Programa de Pós-Graduação em Agronomia por Assunto "2. Fome zero e agricultura sustentável"

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    Metodologia para determinação de deriva em diferentes alturas de barra e velocidades do vento com pontas de pulverização de jato cônico
    (Universidade Estadual do Norte do Paraná, 2025) Motta, Ana Beatriz de Oliveira; Oliveira, Rone Batista de; https://orcid.org/0000-0002-3071-4827; https://lattes.cnpq.br/2379804514613050; Oliveira, Rone Batista de; https://orcid.org/0000-0002-3071-4827; https://lattes.cnpq.br/2379804514613050; Lopes, Valdir; https://orcid.org/0000-0002-7407-7858; https://lattes.cnpq.br/0481390085872915; Alves, Guilherme Sousa; https://orcid.org/0000-0003-4877-0293; https://lattes.cnpq.br/7138496193657632; Gandolfo, Marco Antonio; https://orcid.org/0000-0003-2314-3752; https://lattes.cnpq.br/5560552732033631; Costa, Neumárcio Vilanova da; https://orcid.org/0000-0003-2576-7470; https://lattes.cnpq.br/8328839002732737; https://lattes.cnpq.br/2379804514613050; https://lattes.cnpq.br/0481390085872915; https://lattes.cnpq.br/5560552732033631; https://lattes.cnpq.br/8328839002732737; https://orcid.org/0000-0002-3071-4827; https://orcid.org/0000-0002-7407-7858; https://orcid.org/0000-0003-2576-7470
    The uniformity and quality of the spray depends on the stability of the spray boom height. The height of the sprayer boom, together with variations in weather conditions, causes displacements in the spray jet, by changing the opening angle or projection of the spray jet and the volumetric distribution, which leads to variations in the deposition of droplets on the target. The aim of this study was to develop a methodology to quantify the volume displaced in the projection of the conical jet at different spray boom heights and weather conditions. To this end, a pyramidal structure was developed as an experimental base, which was made based on theoretical calculations of the diameter of the projection of the conical spray jet from the tip, corresponding to each working height, 0.25 m, 0.50 m, 0.75 m, 1.00 m, 1.25 m and 1.50 m. The pyramidal structure was built with the aim of quantifying the volume displaced in the projection of the conical spray jet. The pyramidal structure is made of sheet metal and divided into 6 modules, with an outlet hole, and each module has the length of the opening in relation to the angle of the spray jet projection, being centered below the spray bar to collect the sprayed volume. The experiment was set up in a completely randomized design with 20 replications applied by JCI 80 01 spray tips, with a pressure of 500 kPa, and six spray bar heights. During the tests, weather conditions such as wind speed and direction, temperature and relative humidity were recorded. The displaced volume was positively correlated with boom height (r > 0.71), wind speed (r≥0.98), air temperature (r ≥ 0.94) and negatively correlated with relative humidity (r <- 0.94). The displaced volume of the jet is influenced by the height of the spray boom. Lower boom heights had lower losses and higher boom heights indicated a loss in displacement, with averages of 80%, reaching up to 98.49% at 1.50 m boom height. The pyramidal structure proved to be a methodology that makes it possible to evaluate the displacement of the spray jet projection in a complex field environment. It has a simple structure, low cost, is easy to use and reduces experimental time. The factors that most influenced jet displacement were wind speed and spray boom height, mainly 0.50m.