PerryJosh64, I have commented before on this. My experience is with a LELY PTO Spinner. My take is that a fertilizer spreader will spread a certain VOLUME of product per a certain time depending on the setting. My spreader had a gate which opened to allow the product to pass. This was accomplished by 2 steel rings that rotated creating openings.
You need to determine the density of the product you desire to spread. My fertilizer dealer listed the density on the bill when I got a custom mix. Grain size does NOT give you any idea of what weight the fertilizer is per unit of volume. (e.g. Urea has large grains that are not very dense) I found density listed as pounds per cubic foot.
At first, I created a spread sheet with gate setting on one Axis and weight per acre on the other Axis. I had a nice line for each fertilizer type I spread. They were separate lines though. When I converted to VOLUME instead of weight, I had one line for all fertilizer types when I held the PTO speed and Ground speed and other variables constant.
In addition, you need to realize that the spreader pattern may change with lighter or denser product. Changes to PTO speed, Ground speed, Spacing, etc. will also change the amount of product spread per acre. HTH Keith Williams
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