Abstract
A previous study found very significant quality differences in the apparent pattern of a rotary spreader when different methods of collecting pattern samples were used with the same spreader and product. The laboratory methods of pattern evaluation have now been compared with actual crop response to identify which of the laboratory methods is the best indicator of the actual pattern in the field. The study was conducted on turfgrass using a rotary spreader. Turf quality ratings confirmed that rectangular catch pans with an internal grid most accurately predicted the actual rate and distribution pattern on the crop.
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