The aim of this research was to evaluate the effects of air speed in air-assisted sprayer on bean crop (Phaseolus vulgaris) spray deposition. The experiment was carried out at 48 days after crop emergence and the experimental design was randomized. The maximum air speed in spray boom was obtained with the maximum of the fan rotation by a phototachometer. The middle and third air speed were obtained with lower fan rotation. The tracer used in the spray solution was copper oxid (50% of the metalic copper). It was measured by atomic spectrophotometry absorption equipment. The targets were fixed on the under and upper-side of the leaves, in the top and lower third of the same plant under the spray boom. The effects of variation speed of the air in spray boom were not significant on deposit levels.
air-assistance; tracer; boom sprayer; Phaseolus vulgaris
