Navegando por Autor "Cunha, Waldyr Armando Benitez"

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    Cobertura e deposição da aplicação em relação a direção da semeadura e estágio de desenvolvimento da soja
    (Universidade Estadual do Norte do Paraná, 2021-05-03) Cunha, Waldyr Armando Benitez; Gandolfo, Marco Antônio; https://orcid.org/0000-0003-2314-3752; http://lattes.cnpq.br/5560552732033631; Oliveira, Rone Batista de; https://orcid.org/0000-0002-3071-4827; http://lattes.cnpq.br/2379804514613050; Souto, Ana Carolina; http://lattes.cnpq.br/4909756168282078; Abi-Saab, Otavio Jorge Grígoli; https://orcid.org/0000-0002-1757-636X; http://lattes.cnpq.br/8437035647330384
    In the search for greater operational capacity and operational ease, different directions of displacement in the sprayer in soybean culture have been carried out, but without evidence whether these decisions affect the quality of the application or not. Therefore, this work aimed to evaluate the effect on the quality of the application of different directions of displacement of the sprayer in relation to the sowing lines of the soybean crop in different phenological stages. The tests were conducted through field and laboratory research. As soon as the soybean plants reached the desired development stages of V4/V6, R3/R4, R1/R2, R1/R3, R4/R5, R6/R7 (field), and V3/V4 and R3/R4 (laboratory), applications were made. For laboratory application, a CO₂ pressurized sprayer was used, equipped with 6 spray tips spaced 0.5 m apart and at a height of 0.5 m above the highest surface of the plants, and carried out in the directions of 0°, 45° and 90°. For field application, a tractor of the Agrale 4100® brand was used, equipped with a 7-meter spray bar, spaced 0.5 m apart and at a height of 0.5 m above the plants, carried out in the directions of 0° and 90°. For both applications, a syrup containing water + bright blue marker at a concentration of 6 g L⁻¹ was prepared. The quality of the application was assessed using the marker deposit (volume/area) analyzed by spectrophotometry and coverage (%) evaluated at the top, median and bottom of the soybean plants. Coverage and deposit ratio was performed in the upper and lower thirds depending on the direction of application. The results indicate that the coverage and deposit ratio show greater variability as the development stage and leaf area index increase. The 45° application direction showed greater application homogeneity. It is concluded that the directions of spraying did not influence the deposit and coverage of the vegetative stages, however as the development stage increased, higher values and greater dispersion were found for reproductive stages.