The aim of this study was to evaluate the difference between estimated and observed emitter flow rates presented by the Notliada pulverization system. The research was undertaken in the Hydraulic Laboratory/Rural Engineering Department at "Luiz de Queiroz" College of Agriculture, University of São Paulo, Brazil. The proposed models showed excellent precision and accuracy indexes. It was determine that emitters of diameter 1.212 (black), 1.016 (red) and 1.020 mm (orange); the solenoid valve must stay turned on for a minimum time of 1.0 s. For the blue emitter of 0.621 mm diameter, this time was 1.4 s. The solenoid valve can be kept turned off for any time between 3 and 9 s. The black and orange emitters had unacceptable uniformity application indexes for turn on times less than 0.7 s. The blue and red emitters had excellent indexes for any tested turn on times. All emitters had excellent uniformity indexes for all tested turn off times used on the solenoid valve.
chemigation; solenoid valve; automation
