Caracterização do perfil de deposição e do diâmetro de gotas e otimização do espaçamento entre bicos na barra de pulverização

The choice and correct use of nozzles are essential for the best agrochemical deposition, which is indispensable. The aim of this work was characterize the spray pattern and the droplet diameter offering information to optimize the nozzles spaces in spray boom. Deposition pattern of flat fan nozzles Teejet XR 110015 VS were evaluated, in a patternator, with the nozzle placed 0.50 m above patternator under pressures of 200 and 300 kPa, and the droplet diameter by the laser diffraction method. The maximum distance calculated for an acceptable coefficient of variation (C.V.) was of 0.85 m for the pressures of 200 and 300 kPa, with values of 9.52 and 9.58%, respectively. The optimum distance was around of 0.70 m and to C.V. around 5%. Comparing pressures, it had significant difference for DV0.1 and DV0.5 but not for DV0.9. However the increase on the pressure resulted in a reduction of droplet size there was no significant effect of span due the pressures evaluated. It was concluded that the maximum spacing between nozzles would not be over 0.85 m and the DV0.5 decreased with the increase of pressure from 200 to 300 kPa, but without significance changes of span to droplet sizes.