Broadcast spreaders do a great job of spreading grass seed, fertiliser and weed killer on larger lawns because they throw the material out more consistently over a wide area. However, unless you know how much area they cover for each type of product, you can end up spreading too much or too little and get bad results. The best way to find out the actual dispersal pattern for your broadcast spreader is to do a test run on your driveway and then measure the results.
Clean off a section of the driveway. Close the flow lever on your spreader and set the controls for the product you’re using. Fill the spreader – do this on the driveway to avoid spills on the grass – then open the flow lever and push the spreader a couple of metres down the centre of the driveway at your normal pace, continuing for a few steps after you close the hopper. Measure the average dispersal pattern to the sides and front.
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Source: Family Handyman