this post was submitted on 25 Mar 2024
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At between 20 to 300 lbs per acre, yes. Generally most legumes will need 60 lbs per acre, so most will be self sufficient in ideal weather.
For 60 bushel per acre soybeans still require fertilizing with monoammonium and diammonium phosphates, as well as ammonium acetate, and to go beyond 70 bushels consistently supposedly does require supplemental nitrogen although this has yet to be recreated in studies.
So, you still need to mine ammonia.
So how did these plants exists before mineral fertilizers?
In the yield size we see, they didn't. That's the point. Food crops cannot sustain the current human population. Before humans came along an area had a variety of plants which did not have their stalks and fruit systematically harvested and transported elsewhere. They grew in the ground and their produce would rot where it landed, enriching the soil.
Modern industrial farming is not sustainable for the next hundred years, no, but there are a lot of levers to work to transform it into something that will reliably feed future generations.
One lever is amount and kind of meat in the average diet. It takes something like seven pounds of grain to make one pound of beef. Modern chicken breeds are amazingly efficient at converting feed grain to chicken meat, but even they are something like two pounds in to one pound out. Reducing the percent of meat in our diets would make our food go significantly further.