Fungicide application for soybean rust control forced farmers to upgrade the techniques of pesticide application. This study aimed to compare the spray deposits obtained by two spray tips, flat fan and twin flat spray tip with air induction, with and without the presence of adjuvant in the tank solution, in three regions of the plant canopy and at two different crop growth stages. The soybean crop evaluated was P98Y11RR at growth stages R1 and R5.2. Leaf deposits of the spray mix containing Rhodamine B as tracer dye were recovered from the canopy stratum and analyzed. The use of double fan spray tip with air induction resulted in higher levels of droplet deposit in the upper canopy stratum of soybean plants in the R1 and R5.2 growth stages, and can also replace the standard flat fan tip with the same level of spray deposits on the lower canopy region. The use of adjuvant increased spray deposits in all sections of the plant, with both spray tips in the R1 growth stage.Key words: spray tips, application technology, tracer dye.
RESUMEN
La aplicación de fungicidas para el control de roya de la soja obligó a los agricultores a mejorar las técnicas de los métodos de aplicación de plaguicidas. Este estudio tuvo como objetivo comparar los depósitos de pulverización obtenidos por dos puntas de pulverización, abanico plano y la boquilla de pulverización plana doble con inducción de aire, con y sin la presencia de