Results of spray drift experiments are reported of the H.S.S. CF crossflow fan sprayer. The H.S.S. CF is equipped with a H.S.S. Drift Control system and a H.S.S. Automatic Wind Control (AWC) system to adjust and control air fan speed and the air spout direction based on measured wind direction. When spraying against the wind the air spouts are set rectangle to the driving direction and downwind in an backwards angle giving less air support through tree leaf canopy. The H.S.S. CF equipped with Drift Control and AWC, equipped with 90% drift reducing nozzles and utilizing a lower level of air assistance (1800 rpm fan) obtains a spray drift reduction of 90.6% at 4½-5½m distance from the last tree row compared to the reference spray system for fruit crop spraying in the Netherlands although the outside row of the orchard is sprayed from both sides. When the outside tree row is sprayed only from the outside this H.S.S. CF combination and adapted air spout direction (H.S.S. AWC) obtains a 95.0% spray drift reduction at 4½-5½m distance from the last tree row. Measurement of airborne spray drift averaged over 0-10 m height at 7.5 m distance from the last tree row resulted in a spray drift reduction of 94.4% when spraying with the H.S.S. CF equipped with Drift Control, 90% drift reducing nozzles and utilizing a lower level of air assistance (1800 rpm fan) and two-sided spraying of the outside tree row. Using these settings of the H.S.S. CF in combination with automatic air spout direction of H.S.S. AWC and one sided spraying of the outside tree row resulted in 92.1% reduction of airborne spray drift.
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