Spot basis bids for corn were lower in the US Midwest on Friday amid ample supplies and warm weather cutting into feed demand, while soyabeans were firm, dealers said.
Farmer sales were limited to an occasional truckload or two of corn before the New Year's holiday weekend, supporting higher soyabean bids.
Grain elevators had ample supplies of corn from farmer selling earlier in the week sparked by CBOT rallies. But temperatures in the 40s and 50s Fahrenheit have cut the amount of feed that animals need to stay warm.
"There's less feed demand and there's amply supply so they're backing off (their bids)," said an Ohio dealer.
One exception was in the Decatur, Illinois, market, where corn bids rose 1 cent per bushel. Dealers said that a nearby processor was not able to buy corn early Thursday morning before a drop in CBOT futures and was still looking for fresh supplies.
Barge freight fell again on Thursday on interior rivers leading to export terminals at the US Gulf.
Traded barge values dropped on the lower Ohio River and Illinois River. Bids fell on the Mississippi River at St. Louis.
Weekly net export sales of soyabeans were 890,200 tonnes, up 7 percent from the prior week with China buying 477,000 tonnes, USDA said.
For corn, weekly net export sales amounted to 360,200 tonnes, a marketing-year low and down 54 percent from the prior four-week average.
Weekly net export sales of wheat were 356,500 tonnes, down 32 percent from the previous week and 26 percent below the prior four-week average, USDA said.
At 8:50 am CST (1450 GMT), CBOT soyabeans were called to open 1 to 2 cents per bushel lower. Traders expected spillover technical pressure after the sharp decline in prices on Thursday.