The anticipation that a government report this week will show a bumper crop of corn caused corn futures to slip to the lowest price in more than three years, according to a Blomberg report. Soybeans gained, wheat prices fell.

The corn crop may reach a record 14.03 billion bushels, or 1.3% more than the U.S. Department of Agriculture (USDA) predicted in September and 30% larger than in 2012, according to a Bloomberg survey of 36 analysts. Inventories before the 2014 harvest may more than double to 2.04 billion bushels from a year earlier, the survey showed. USDA will update its forecasts on Nov. 8.

“Prices are being more heavily influenced again by the prospect of a high global corn surplus,” Carsten Fritsch, an analyst at Commerzbank AG in Frankfurt, said in a report. “This is looking increasingly likely in view of positive U.S. harvest results.”

Corn futures for December delivery slipped 0.2% to close at $4.2625 a bushel at 1:15 p.m. on the Chicago Board of Trade, after touching $4.2525, the lowest for a most-active contract since Aug. 26, 2010.

On Nov. 1, INTL FCStone Inc. and Informa Economics Inc. raised their estimates for U.S. production. A bigger U.S. crop will spur a rebound in world stockpiles to 155.19 million metric tons by the end of the 2013-2014 season, up from 122.59 million a year earlier, Bloomberg’s survey showed.

Soybeans

Soybeans rose on increasing demand for U.S. exports, Greg Grow, the director of agribusiness for Archer Financial Services Inc. in Chicago, said in a telephone interview. The USDA inspected 80.6 million bushels for shipment in the week ended Oct. 31, up 32% from a year earlier.

“The demand for U.S. soybeans is extraordinary,” Grow said.

Soybean futures for January delivery rose 0.4%% to $12.565 a bushel, after dropping 3.2% last week.

Wheat futures for December delivery fell 0.7% to $6.6275 a bushel, after touching $6.62, the lowest since Sept. 25.