Abstract
Standard rotary broadcast spreader pattern tests evaluate the steady-state patterns as the spreader is operatedback and forth across a field but do not consider the transient patterns at the ends of the field when the operator turns thespreader on or off as he enters or leaves the header strip area, resulting in pattern overlap. A study was conducted toindependently determine the steady-state, stopping, and starting patterns for a typical rotary turf spreader. The patternswere then superimposed by computer to evaluate the resulting overall transient patterns with different amounts ofpenetration into the header strip prior to turning the spreader on or off.<br><br>The results demonstrate the nonuniformity of spread possible at the intersection of the header strip and the back-andforthpasses and the major effect on pattern uniformity of different engage and disengage points. None of the intersectingpatterns in this study were truly acceptable. This implies that unacceptable uniformity at the field ends is possible fromthe standard back-and-forth/header strip mode of rotary broadcast spreader operation.
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