Best amendments to improve soil microherd?
Neither compost nor manure are options. I've had many negative experiences with herbicide residues in manure and compost trucked in. As for my own compost, I moved into this place last fall and started a compost pile but it takes 2-3 years to be ready in this climate.
I use alfalfa meal as my only amendment so far. Are there any materials I can use that will encourage good microbial diversity?