Calibrating granular pesticide applicators
Some pesticides are applied as granules that have been impregnated with a fixed amount of pesticide to eliminate the need for mixing. When used for row crops, most granular pesticides are applied with either a band applicator or a broadcast applicator. Because some granule applicators are sensitive to speed, it is important to maintain a uniform travel speed for consistent performance. Wind can greatly affect the distribution from granule applicators. Adjust distributors to minimize the effects of wind. To reduce the effects of moisture on the metering of granules, empty the granule hoppers every day. Granule application rates are affected by the following variables: orifice size (feeder-gate setting) ; ground speed ; agitator speed ; size and nature of granules ; roughness of the ground ; humidity ; temperature. This guide describes the procedures for calibrating band and broadcast granule applicators.
Archive version. For the most recent information see extension.missouri.edu.