Deposição de defensivos agrícolas na cultura da soja: influência do volume de calda e modelos de ponta para aplicação com drone

Abstract

The present work aimed to evaluate the quality of deposition of pesticides in soybean (Brasmax Lance), taking into account the spray volumes (10, 15 and 20 L ha-1) and the nozzle models for application (1- TXA8001vk t empty cone jet and 2- XR11001vs fan). The research work was carried out in January 2022, in commercial farming in the town of Bela Vista, in the interior of the municipality of Novo Barreiro - RS. A randomized block design was used, with 6 treatments and 4 replications, totaling 24 experimental plots of 36 m2 each plot. For the application of the treatments, a sprayer drone, model Agras MG 1P RTK, was used at a flight height of 3 meters. The quantity and quality of application was analyzed using hydro sensitive papers (water sensitive paper), which were positioned in the upper and middle thirds of the plants. To quantify the percentage and analyze the area covered by the drops, the GOTAS EMBRAPA software was used. The data obtained were submitted to analysis of variance (ANOVA) using the Sisvar software and the means were compared using the Tukey test at 5% error probability. Finally, there was no statistical difference between spray nozzle tips, and between spray volumes of 10 and 15 L ha-1. However, when the spraying volume was increased to 20 L ha-1, there was a higher percentage of coverage and higher droplet deposition in the soybean canopy.