100% Organic Horse *DRY* Manure Compost. 100% organic no additives horse manure compost great for growing mushrooms or any plants requiring high quality substrate material. A trailer load contains 6-7 yards of compost covers 800 square ft with 6' deep. No need to tilt in, just generously fill in as soil and plant right in. We load but you pick up. Once payment submit, we will call you to set up the pick up.