Chicago Board of Trade (CBOT) grains futures closed mixed on Tuesday with wheat futures sinking to contract lows, weighed down by abundant global supplies and technical selling as prices extended a fall that started in early July.

After Monday's United States Department of Agriculture Crop Progress Report that showed little change in development, the markets are directionless.

The most active corn contract for December delivery fell 3 cents, or 0.83 percent, to 3.60 dollars per bushel. December wheat delivery went down 8 cents, or 1.83 percent to 4.29 dollars per bushel. November soybeans rose by 1.25 cents, or 0.13 percent, to 9.375 dollars per bushel.

In the outside markets, the Brent crude oil market is 0.37 dollar per barrel higher, the U.S. dollar is higher, and the Dow Jones Industrials are 182 points higher.

U.S. Commodities grain analyst Jason Roose, says that the grains are searching for value. He maintains all grains are oversold due for a value-added rally, but bullish news is limited with harvest fast approaching.