What is wrong with just using composted manure and dead fish (adds nitrogen) for fertilizer as the early pioneers did? You could use wood ash to add lime to your soil.
I have a friend that gets truckloads of soil from a local lake when they lower the water levels. He has never had to use any fertilizer other than that, and his gardens are amazing!
Oh, I've got goats and a hen so I've got plenty of manure. I've got acid soil and am saving up ashes from thee wood stove for certain plants like peppers.
I'm talking about the corn/soy/wheat farmers that farm 1000s of acres and use man-made fertilizers. Agriculture is very screwed up these days. What we need is several million small farmers who grow food plants and animals.