However, drop spreaders are generally more precise than rotary spreaders and deliver a better pattern. In addition, because the granules drop straight down a short distance, there is less chemical drift and pattern distortion. To avoid nonuniform spread when turning corners, always turn off the spreader while making turns. This means that you should treat the strips at both ends of the area first. This allows you to start in this strip and turn the spreader on as you cross the start line.
Rotary spreaders cover a wider swath than drop spreaders.
Therefore, they are preferred by applicators servicing large lawns and golf courses. Overlapping to obtain a uniform pattern changes with each product. The drop holes often get clogged. Turning changes the rotating plate speed. Although rotary spreaders are generally less precise than drop spreaders in terms of uniformity of distribution, with proper calibration and operation they too provide satisfactory results.