Drop spreader rates differ significantly from rotary and hand spreaders as they deliver seed by directly dropping seed over the prepared area. Drop spreaders are far more accurate than rotary spreaders but require more time to use.
Rotary spreaders work by broadcasting seed in an arcing pattern over a lawn area. Most grass seed bags list the recommended settings of the most common manufactured spreaders. Depending the grass seed type, generally seed should be applied at a rate of 3 to 4 lbs. per thousand square feet.
Hand spreaders are hand-held rotary spreaders suitable for seeding smaller areas. Settings for hand spreaders can be determined by using the recommended seeding rate on the package of seed and using the manufacturer's recommended setting for the desired rate.