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Calibrating Your Spreader
Unfortunately, because granular products come in many different particle sizes and densities, the speed you walk, spreader condition, texture of ground and other factors, there is no way to determine a universal pounds per thousand spreader setting. One simple solution would be to do a 50 foot by 20 foot test. The 50 by 20 rule will allow you to determine appropriate pounds per thousand rates for any product in any spreader.
  • Weigh out and place enough material in the hopper to cover 1,000 sq. ft.
  • Place the spreader setting on a low setting about ¼ of the way open.
  • Apply the weighed material over a 50 x 20 ft. area (This is 1,000 sq. ft.).
If material is left over, you are under applying and will need to increase the setting accordingly, before applying to the remainder of the lawn. 
If you come up short, you are over applying and you will need to decrease the setting, before applying to the remainder of the lawn.

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