Grass clippings and tree leaves will provide a bulk of your soil. The compost that you make from there would just need to be aerated with something like perlite. Everyone says to use pumice, but good luck finding that in Okla. Really, I bought a nice Honda mower with a bagger just to collect grass clippings. It also gave me a good reason to start taking care of my lawn! I have trees all around me, but they are kind of a pain with these little vines that get caught up in the rake. Also, go out in the woods and find some rotten wood, the stuff that falls apart in your hands. It's packed full of fungi. You would be surprised how far you can get in organic farming with just a little will power and knowledge. Tree leaves will be your brown carbons while grass will be the green nitrogen. You can also add native plants to the compost like Lambsquarter, I'm saying this because I have it in my yard too(Oklahoma). I don't know if you have access to the countryside or anything, but a lot of the native "Weeds" can be added to compost and they will bring the micronutrients. I talk highly of Greensand, but if you find lambsquarter, then you will have you manganese and iron source(important). You can make the best compost in the county and not spend a dime, except for gas lol. Egg shell is also better than oyster shell flour because it has 1% iodine. They are both like 96% calcium carbonate, but egg shell has that extra 1% of goodies.
Lambsquarter:
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