Carl from Mobile, Alabama writes
Unfortunately the manufacturer does not give usage instructions for all of the different spreaders on the market. Here is how they suggest calibrating your spreader:
If you need to use 1.5-4.6 lbs of product per 1,000 sq ft you would add the needed amount of product to spreader, start with a medium setting, then apply product to a 20 x 50 ft area (1,000 sq ft). If you have product left, your setting is too low. If you run out of product, your setting is too high.
Be sure to read the product label to determine the usage rate for your needs.
Answer last updated on: 04/12/2013