Winegrowers in the north of Paraná State carry on grapevines in arbour and pesticide applications could overcome more than fifty times in a cycle. The aim of this study was to evaluate the features of the air assisted sprayer application system by spray volume deposition and losses. Five treatments and four randomized blocks were used. The treatments varied the droplet size and application volume. The evaluation of the system was done with a 5% spray solution containing KCl being the leaves spray deposit measured through electric conductivity and the losses by the comparison among applied and recovered spray volumes on the leaves. For all of the conditions, the losses were above 48%, the conditions of larger volumes presented the largest depositions and larger droplets presented larger deposit and same loss in relation to smaller droplets. The smallest volumes did not differ regarding the deposition standing out the larger droplets to low volume conditions and the witness used by the winegrower (small droplets and low volume), that presented the smallest losses. The results demonstrate that the air-assisted sprayer is an important tool to maximize the pulverization operations in grape and the alterations of nozzles configuration should be better studied.
agrochemicals; deposition; air-assistance
