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    Determining Delivery Rates of Push-Type Granular Product Spreaders

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    A method for and the equipment needed for calibrating delivery rates of push-type granular product spreaders are discussed.

    This method has proven to be suitable for use by product and equipment manufacturers in determining specific product spreader settings for the full range of push-type spreaders and for some small tractor-pulled models.

    Experience over a wide range of materials and conditions has provided numerous insights into some underlying principles and problem areas. These are treated briefly and include the following: (a) the need for proper metering orifice calibration, (b) variation between individual spreaders of the same model and manufacturer, (c) flow variations in relation to the hopper-fill level, (d) the nonlinear relationship between the flow and the spreader setting scale, (e) problems due to spreader wear, (f) variation due to the product repose angle, and (g) variation due to particle size changes in the product.


    pesticides, application equipment, calibration, granular formulations, repose angle, particle size

    Author Information:

    Birthisel, TD
    Technical manager, The Andersons, Lawn Fertilizer Division, Maumee, OH

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP19405S