2022/1/30/ · When I googled how to compost horse manure, or talked to people who were doing it, I heard the same advice about layering the manure with dry shavings, straw, or leaves. And that you also had to either turn the pile regularly (I know a woman who had 2 horses and would hand-turn her manure compost with a shovel!), or, use some kind of aeration method -