The experiment was set in Botucatu, São Paulo State, Brazil, in the soybean crop, harvest 2006/07. Two application technologies have been compared: conventional spraying (without air); spraying with air assistance in the sleeve boom at 9, 11 and 29 km h-1 of the air speed on artificial targets as well as in the control of soybean rust in different parts of the plants. For the adaxial surface of leaves in the top part of the plants, the air assistance with 11 km h-1, provided greaters spray deposits. In the bottom part of the plants it was not observed significative differences between the treatments. The deposits in the abaxial surface of leaves in the top part of the plant, with maximum air speed generated by the fan (29 km h-1), provided greaters levels of deposits. The air assistance provided a higher productivity, in relation to conventional spraying (without air) and check (no treated).
application technology; deposition; chemical control
