Grain futures prices were mixed Friday on the Chicago Board of Trade. Corn was up 1/2 to up 3, soybeans were off 9 1/2 to up 10 3/4 and wheat was off 1 3/4 to up 3. May corn seesawed throughout the day amid suggestions corn from Ontario was moving into the United States. Argentina estimated corn production slightly higher than USDA estimates, leading to a negative tone. February soybean crush figures were 5 million bushels lower than January, sending the market lower. Profit-taking put a lid on wheat. The prices: Corn: May 7.17 up 1/2, Jly 7.00 1/4 up 1 3/4, Sep 5.86 3/4 up 2 3/4, Dec 5.61 3/4 up 2 1/2. Soybeans: May 14.26 off 9 1/2, Jly 14.10 3/4 off 5 1/4, Aug 13.70 1/4 off 5 1/2, Sep 13.01 1/2 unchanged. Wheat: May 7.23 off 1 3/4, Jly 7.21 1/4 up 1 1/4, Sep 7.26 3/4 up 2 1/4, Dec. 7.39 up 2 1/2.