Variable moisture corn harvested last fall may cause even more problems this summer, and farmers should check their bins and the condition of their corn.

"Last fall, because of the growing conditions, we had dry corn at one end of the field, wet corn at the other," said Charles Hurburgh, professor of agricultural engineering at Iowa State University (ISU). "Well, of course that got mixed together when you harvested."

He said no dryer will be able to even...