Grain bins are built without cranes or heavy equipment by building from the top down and jacking it up hydraulically.
Grain is held at the optimum humidity (too wet promotes mold, too dry decreases profit when it's sold by weight) by fans blowing up from below, drying an incrementally ascending layer of beans gradually. What he doesn't explain is the over-drying of lower layers while attempting to dry upper layers. It's probably best to harvest close to the optimal moisture level so you don't have to do much active drying.
The farmer also mentions that he will increase the humidity by blowing the fans on humid days, if need be.
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