CHICAGO: Chicago Board of Trade corn futures fell for the fourth day in a row on Wednesday, with investors shedding risky assets amid broad concerns about the global economy.

* The US Agriculture Department's bearish harvest forecast that sent prices sharply lower on Monday and Tuesday continued to hang over the market.

* The benchmark CBOT December contract firmed early but hit resistance at the low end of its 20-day Bollinger range.

* The most-active contract hit its lowest on a continuous basis since May 16.

* The USDA's weekly export sales report on Thursday morning was expected to show export sales of corn between 200,000 tonnes and 700,000 tonnes. A week ago, corn export sales totalled 239,598 tonnes.