CARACTERIZAÇÃO DO ESPECTRO DE GOTAS EM PULVERIZAÇÃO COSTAL NA CULTURA DO JILOEIRO (Solanum aethiopicum)

Abstract

The use of hand-held sprayers is common in rural properties for the application of phytosanitary products. The spray tips are one of the most important components of this equipment and are differentiated by their management practices in the control of weeds, insects or diseases. The experiment was conducted to evaluate the spectrum of droplets in spray mixturein a randomized block design (DBC) with a 2x3x4 factorial scheme, consisting of two pressures and three spray tips, with four replications using two pressure regulating valves. Before the analysis of the droplet spectrum, the images were modified by the Image J software and binarized in the R band. Subsequently, they were analyzed by the Gotas® software. Values of: number of drops, dispersion, applied volume, coverage and DMV were extracted. Then, the values found were subjected to the “F” test at 5% probability and, according to the significance, they were compared by the Tukey test at 5% probability. For each factor, the coefficients of variation were evaluated separately and later an analysis of the correlation between these factors was realized. The 45 psi pressure produced the largest number of drops, showing a significant difference between the pressures. Coverage was also the best at this pressure, with the highest percentage of coverage. the tip ADIA–02 with air induction and the tips AD5G–02 and AD –02–D without air induction are considered large drops.