Normally, Ron McCartney would be ecstatic about the bumper crop of corn he harvested last fall. But now, it's looking like a mixed blessing. That large crop, along with severely depressed corn prices, has forced him to rent expensive storage space in a silica sand mine 30 miles from his 1,700-acre farm in northeast Iowa. "I hate doing this," says McCartney. "They've taken advantage of the situation and raised rates."

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