Wheat should be cooled as weather
permits to reduce the activity of
insects, to inhibit the growth of storage
molds and to prevent moisture migration. As
outside air temperatures drop, the grain against
the wall of the bin begins to cool. The cooler air
in the grain at the walls is relatively dense
compared with the warm air in the center of the
bin. This dense air at the walls moves downward
and displaces air in the warm core of the bin. As
this natural air current moves through the grain,
it picks up moisture. When the air reaches the
cooler surface grain at the top of the bin, the
moisture condenses on that grain and causes
spoilage. Regular aeration intervals prevent
moisture migration by keeping the average
grain temperature more similar to outside
temperatures