U.S. corn futures rose to a one-week high on Wednesday as traders evened up positions before the federal government releases major crop reports at the end of the week, while wheat and soybeans sagged.
Traders bought back previously sold positions in the corn market after making money recently on bets that prices would decline.
They said Friday's U.S. Department of Agriculture reports on supply-demand and quarterly U.S. grain inventories could change trends in the market. Corn has swung by the maximum daily trading limit six years in a row on the day of the department's January announcements.
"Going into a major report, we're trying to rebalance a bit," said Don Roose, president of U.S. Commodities. "It's going to be all about this report that gives us a clue on market direction."
Chicago Board of Trade (CBOT) March corn jumped 5-1/2 cents, or 0.8 per cent, to $6.94-1/4 a bushel.
The market has rebounded two per cent since hitting a six-month low on Monday on concerns about sluggish demand.
"With the uncertainty that a report brings, a lot of the traders who are short are willing to get out of those positions and get flat," said Brian Hoops, president of Midwest Market Solutions.
Competition with Brazil
Expectations that a record-large soybean harvest in Brazil will reduce demand for U.S. oilseeds weighed on soy prices.
March soybeans shed one cent, or 0.1 per cent, to $13.85-1/2 a bushel.
Brazil, which competes with the U.S. for export sales, on Wednesday raised its soybean production forecast to a record 82.7 million tonnes, up 0.1 per cent from its estimate last month and 24 per cent above last year's harvest.
Private U.S. exporters reported the sale of 120,000 tonnes of optional-origin soybeans to top importer China for delivery next marketing year, according to USDA. Optional-origin sales allow for the commodity to come from the United States or other nations.
Hoops said U.S. exporters will likely book South American soybeans for shipment to China, a "telling" sign that buyers are shifting purchases away from the United States.
On Friday, USDA is expected to raise its forecast for Brazil's soybean harvest by 0.9 per cent from last month, to 81.8 million tonnes, according to a Reuters poll.
Traders on Thursday will assess USDA's weekly export sales data. Sales from last week are projected at 200,000 to 400,000 tonnes for soybeans, 325,000 to 425,000 tonnes for wheat, and 100,000 to 200,000 tonnes for corn.
Corn futures were underpinned by an increase in global demand after a lull in purchase tenders over the holidays and the recent decline in prices, traders said.
South Korea's Feed Leaders Committee (FLC) purchased 69,000 tonnes of corn, 55,000 tonnes of feed wheat, and 45,000 tonnes of soymeal in a tender on Wednesday, traders said.
South Korea's Major Feedmill Group (MFG) on Tuesday bought 137,000 tonnes of corn for arrival in May, while the Korea Feed Association (KFA) bought 110,000 tonnes of corn likely to be sourced from South America. A group of private Israeli buyers issued international tenders on Tuesday to purchase 135,000 tonnes of corn and up to 50,000 tonnes of feed wheat.
Wheat futures weakened, with the March contract sliding five cents, or 0.7 per cent, to $7.45-1/2 per bushel.
-- Tom Polansek writes for Reuters from Chicago. Additional reporting for Reuters by Michael Hogan in Hamburg and Naveen Thukral in Singapore.