Chicago Board of Trade (CBOT) grains futures closed lower Wednesday as the U.S. Department of Agriculture (USDA) report projected higher supplies than the market had expected.

The most active corn contract for December delivery dropped 15.5 cents, or 3.74 percent, to 3.9875 U.S. dollars per bushel. September wheat delivery added 3 cents, or 0.55 percent to 5.53 dollars per bushel. November soybeans rose 4 cents, or 0.38 percent, to 10.4325 dollars per bushel.

In its report, the USDA pegged the U.S. 2017/2018 corn ending stocks at 2.32 billion bushels vs. the average estimate of 2.181 billion bushels and last month's 2.11 billion.

The USDA sees U.S. 2017/2018 soybean ending stocks at 460 million bushels vs. the trade's estimate of 495 million bushels and USDA's June estimate of 495 million.

U.S. 2017/2018 wheat ending stocks are pegged at 938 million bushels vs. the trade's estimate of 876 million and USDA's June estimate of 924 million.

Soybeans fell for the first time in eight sessions as prices edged down from a four-month peak.