There’s a handy little “whirligig” spreader that is designed for fertilizers- I don’t know what it’s called but it holds about 1/2 gallon dry granules and you walk around the area turning the little crank and refilling it- we use ours primarily for salting the sidewalks. Covers a lot of territory pretty quickly. There’s a push variety too, holds more and is operated by the turning of the wheels as you push. Looks (and works) a lot like a kid’s toy, so you can have fun while you work!
:-)M