Soybeans tumble with most grains higher CHICAGO, May 18 (UPI) -- Grain futures Friday were mostly higher on the Chicago Board of Trade, with the exception of soybeans as the dollar index fell 0.54 percent. Corn was up 7 1/4 to up 10 1/2, soybeans were off 18 1/2 to off 33, wheat was up 29 1/2 to up 37 1/2 and oats were up 1 1/2 to up 2 3/4. Corn prices firmed with purchases by China offsetting a week of negative outside influences. Wheat futures made sharp gains with support from the weaker dollar. Soybean futures plunged late in the day on beneficial weather reports and a lack of demand news. Corn: Jly 6.35 1/2 up 10 1/2, Sep 5.46 1/2 up 8, Dec 5.237 up 8 3/4, Mar 6.46 1/2 up 7 1/4. Soybeans: Jly 14.05 off 33, Aug 13.81 off 24 1/4, Sep 13.27 off 20 1/2, Nov 12.88 1/2 off 18 1/2. Wheat: Jly 6.95 1/4 up 37 1/2, Sep 7.03 up 33 1/2, Dec 7.20 up 31 1/4, Mar 7.33 up 29 1/2. Oats: Jly 3.40 up 1 1/2, Sep 3.44 1/2 up 1 1/2, Dec 3.50 up 2 1/2, Mar 3.53 1/4 up 2 3/4.