Grains mixed in Chicago Wednesday CHICAGO, Jan. 4 (UPI) -- Grain futures closed mixed on the Chicago Board of Trade Wednesday as the dollar index rose 0.58 percent and a rally in equities stalled on Wall Street. Corn was unchanged to off 3/4, soybeans were up 1 3/4 to up 3 1/4, wheat was off 7 to off 8 and oats were off 3 1/4 to off 5 1/2. Corn futures were flat with support provided by an extended dry spell in Argentina. Wheat futures were pressured by improved conditions for winter wheat in Kansas and Oklahoma. Soybeans prices rose modestly with crude oil prices rising, which had a negative influence. Corn: Mar 6.58 1/2 unchanged, May 6.66 3/4 off 1/4, Jly 6.73 off 3/4, Sep 6.17 3/4 off 1/4. Soybeans: Jan 12.21 1/2 up 3 1/4, Mar 12.30 up 2 1/2, May 12.39 1/2 up 2 1/4, Jly 12.48 1/2 up 1 3/4. Wheat: Mar 6.50 off 7, May 6.68 off 8, Jly 684 off 7 3/4, Sep 7.00 off 7 1/2. Oats: Mar 2.93 off 5 1/2, May 2.98 off 5 1/4, Jly 3.03 1/4 off 3 1/4, Sep 3.09 off 3 1/4.