Velocidades de operação em aplicação de fungicida na cultura da soja

Abstract

As fungicide applications, in soybean (Glycine max L.), they are carried out with bar sprayers, as they are more efficient in covering the target. In this work, a self-propelled bar sprayer was used, equipped with a flow meter and automatic flow regulator. The site of the experiment in a soybean crop, located in the northwest of the state of Rio Grande do Sul, harvest 2018/19. This study aimed to evaluate the median volumetric diameter (DMV), the coverage and the density of droplets in the application of fungicides in the soybean crop, operating with an automatic sprayer propelled at rates of 9,12,15 and 18 km.h-1 . Severity of illness and productivity were also assessed. It was concluded that the operating speed interferes complementarily in the DMV, in the upper, middle and lower thirds, and also in the anterior and posterior side of the plant in relation to the displacement of the spray boom. Disease severity and productivity did not differ.