Chicago Board of Trade (CBOT) grains futures closed mixed on Tuesday with managed funds keeping their net short positions.

The most active corn contract for December delivery fell 2.25 cents, or 0.64 percent, to 3.4875 dollars per bushel. December wheat delivery rose 1.75 cents, or 0.41 percent to 4.2975 dollars per bushel. November soybeans went down four cents, or 0.42 percent, to 9.3725 dollars per bushel.

According to AgResource Company, managed funds' position Tuesday morning in Chicago wheat was estimated at a net short 70,000 contracts, In corn, it's pegged at net short 50,000 contracts, with net short 30,000 contracts in soybean.

Private exporters have reported to the U.S. Department of Agriculture their export sales of 198,000 metric tons of soybeans for delivery to China, and 226,000 metric tons of corn to Mexico. But the news failed to lift the futures' prices, which are seasonally low.

Wheat prices rallied following a more-than-one-percent fall in the previous session, as a result of bargain-buying. Egypt reportedly secured 235,000 metric tons of wheat for early October delivery from Russia and Ukraine, which also boosted the wheat futures.