Influência da velocidade e diferentes tipos de pontas na qualidade de aplicação de fungicida na cultura do algodão

Abstract

Brazil is one of the largest producers and exporters of cotton in the world however, its cultivation is of high cost, being necessary to have improvements in its productive processes. For the cultivation of the cotton several applications of agricultural pesticides are necessary, being the improvement of the application a good possibility to optimize inputs. The application technology consists in placing the product in the target, in a necessary quantity, and in a way not to waste product, and with the minimum contamination of other areas, being that there must be good quality of application, obtained by the correct choice of the spray tips, since of all the components of a spraying machine, the tips hold great importance. In this way, this work was aimed to analyze the influence of speed and type of tip in the quality of application of pesticides. Five different tips and four displacement speeds were evaluated, applying quality parameters such as: DMV, coverage, density, application volume and relative amplitude (dispersion). The speed did not affect in the factor type of tips and height of the plant. There was a significant difference for the density parameter, with the two higher speeds presenting greater coverage, and DMV with the lowest speed responsible for the largest volumetric diameter. The cone jet tip presented the best dispersion value among those evaluated and the drop size appropriate to the application being performed. The speed at which the best performances in terms of density and the lowest DMV value were obtained was 20 km h-1.