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Step 1: Collect Bat Guano Step 2: Harvest for Potassium Step 3: Profit!
(www.researchgate.net)
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They actually used to do this for real with bird guano, it was a vital part of industrial farming before they figured out how to make ammonia in a lab. There was even a war over it!
Bat guano was also used to a lesser extent, and Confederates used it during Civil War blockades to manufacture gunpowder.
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Wasn't that to harvest the nitrate, not the potassium?
Honestly I don’t know much about the chemical side, so you’re probably right.