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Slow selling of corn from storage underpinned basis bids at interior elevators, processors and ethanol plants, traders said.
An elevator in Lincoln, Nebraska, raised its bid by 2 cents from Friday.
Soybean bids were mixed at river terminals.
Weakness in the futures market has pulled cash prices well below break even levels for most growers.
Soybean futures on Monday touched their lowest prices since December 2008, on concerns about the escalating US-China trade war.