Join Date: Jul 2010
Location: East Central Illinois
Plan on next year and pile up stall leavings. This will cost you nothing but sweat equity. Horse manure takes 4 months to break down outside and be usable to amend soil. Sand is a good additive for clay, but compost, which can be stall cleanout, the manure with the soiled bedding contains a plethora of microorganisms, fungi and small critters that feed plants and it is loose, to allow for roots to spread easily.
Don't till it, just rake and fluff it and it's ready for use.
Honestly, gardening is a science, which I've learned from several forums and my personal experiences over the last decade--I AM NOT MASTER GARDENER!!--but I grow/harvest tomatoes, beets, okra, peppers and potatoes every, and I've had squash and pumpkin harvests. They can be killed off by parasites, but that's another story.