Department of Soil&Crop Sciences

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Calibrating a Rotary Spreader

Catch pan with fertilizer

Measure the amount of fertilizer in each of the catch pans. The center catch pan should have the most fertilizer and the outer most catch pans should have the least - in each successive catch pan away from the center - there should be an equal amount of fertilizer in the left catch pan and right catch pan. This should produce a bell shaped curve. If you overlap 100% or wheel to wheel coverage then the bell shaped curve patterns overlap and the result is a consistent amount of fertilizer on all areas of the turf.

bell shaped curve overlap

Successive passes with a fertilizer spreader should overlap 100% or wheel to wheel to maintain a nearly constant level of fertilizer applied over the entire area.


Designed by Jason L. Gray.