Different species of grass have different needs, too. Kentucky bluegrass, for example, requires more nitrogen than fine leaf fescues. If bluegrass doesn't get enough N, it is less competitive against weeds and pests. Apply with care. The whole idea is to get the right amount on the lawn and none in our streams and lakes.
Rotary spreaders cover a wide swath.
But they can also hurl fertilizer into streets and driveways where the next rain carries it into our waterways. A drop spreader may take a little longer, but it puts the fertilizer exactly where you want it. Use care loading spreaders. Sweep up spills before they become a pollution problem.