We live in the mountains of WV and use grass clippings(try to limit weeds) and scraps to compost with and fertilizer as needed. Our soil is a clay mix and not that good, it takes time to build it up. You may want to get the book, “The Encyclopedia of Country Living” It is a good resource for many things.
Someone sent me a mail suggesting horse manure. I do have horses around and some barns have large, old piles outside. I need to figure out how I would haul it.