Calibration is a way of checking and/or making adjustments to manure application equipment to ensure that a nutrient source is being applied uniformly and at the desired rate. It is important to properly calibrate manure application equipment to minimize the potential for over or under applying nutrients to a crop.
There are two methods for calibrating manure application equipment:
For more information on calibration, including uniformity of spread pattern and examples of worksheets, refer to the following University of Maryland Extension Soil Fertility Guide publications:
For more information about operating and calibrating many types of nutrient application equipment, consult NRAES-57 "Fertilizer and Manure Application Equipment" available from the Natural Resource, Agriculture, and Engineering Service. The cost of this publication is $6.00.
Nutrient Management Advisors in University of Maryland Extension offices can provide instruction and assistance with manure spreader calibrations. Please visit our Nutrient Management Advisors web page to find your local Extension advisor.