Chicago Board of Trade (CBOT) grains futures closed mixed on Monday ahead of a key monthly agricultural supply and demand report.

The most active corn contract for December delivery rose 0.75 cent, or 0.21 percent, to 3.575 dollars per bushel. December wheat delivery dropped 3 cents, or 0.69 percent, to 4.3475 dollars per bushel. November soybeans fell 2 cents,or 0.21 percent, to 9.6 dollars per bushel.

CBOT brokers reported that funds sold 1,000 contracts of wheat, 1,500 contracts of corn and 2,400 contracts of soybeans.

As investors await the monthly report on agricultural supply and demand,which will be released by the U.S. Department of Agriculture on Tuesday, the market saw a mixed and choppy session.

U.S. weekly exports for the week ending September 7 were 26.1 million bushels of corn, 40.6 million bushels of soybeans and 16.4 million bushels of wheat. The soybean export volume was above trade expectations, while the grains were close to forecasts.

The Russian Grain Union met in Moscow last week, during which Russian officials assured the participants that the government would do its best to boost export. Analysts expected that Russia would be able to export 32-33 million metric tons of wheat, and this would add more pressure to the already swelling world wheat supply.