It's also something that farms do to fallow a few acres. They give each section of crop a burning, so that it lays fallow and is able to regenerate and remain fertile. Then the following year, they use that section for growing, and fallow the section from the most recent crop. If there are crops within a few square miles of where you're seeing/smelling the smoke, they might be using this method. I don't know if they do this in Florida but I know they do it in Quebec province, Canada.
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