This research aimed to evaluate the effects of chemical control of the rust and deposition fungicide sprayed under four air speed in spray boom on soybean crop (Glycine max L.). Two experiments were carried out in FCA/UNESP-Botucatu/SP (season 2007/08). The tracer used in the spray solution was copper oxychloride (50% of the metallic copper). It was measured by spectrophotometer of atomic absorption equipment. The targets were fixed on the under and upper side of the leaflets, in the top and lower parts of the same plant under the spray boom (experiment 1). After the application of pyraclostrobin + epoxiconazole fungicide mixture with the differents air speed (0, 9, 11 and 29 km h-1) rust severity and crop yield were evaluated (experiment 2). Significant differences were obtained in the lower part of the plants for spray deposition using higher speed of air assisted. In the top of the plants were found the great levels of deposition when used spraying without air-assisted. The rust severity was more intense in treatments without air-assisted. The crop yield did not show differences between the treatments with fungicide application, but with advantage to the air-assisted sprayer.
Application technology; deposition; soybean rust; air assisted
