Desempenho de pontas do tipo cone com variação da taxa de aplicação e velocidade de pulverização na cultura do algodoeiro

Abstract

Cotton stands out as a raw material produced in the state of Mato Grosso due to its adaptation to climate, profitability and its cultivation in a sucession with soybean. Because it is a crop susceptible to fungi attack, especially the ramularia that attacks the leaves of the lower part of the plant, high investments are made in agricultural pesticides making this crop costly. The application technology consists in increasing the efficiency of the application of inputs, with the correct use of the product in the target and without contamination of the surrounding environment. In order to reduce costs and improve the parameters of the application, the objective of this work is to test different types of conical and pendant jet tips, varying the rate of application and speed of cotton spraying. Empty cone tip of the TeeJet Tx brand, full cone of the brand MagnoJet CH100, hollow cone of the brand Hypro 30HCX10 and Lechler pendant associated with the hollow cone of the brand Hypro 30HCX10 were used. The velocities evaluated were 20 and 27 km h-1. The application rates were 50 and 80 L ha1. The parameters evaluated were: DMV, relative amplitude (dispersion), volume, density and coverage. DMV was satisfactory for all treatments. The full cone jet tip obtained lower results in the parameters of droplet density, DMV and dispersion. At the top speed the parameters application volume, density and coverage obtained better results compared to the lowest speed. The higher application rate improved the application quality parameters in droplet density, coverage and volume. The pendant accessory did not obtain significant results for density, dispersion, volume and coverage in the cotton crop.