CHICAGO (AP) _ Grain futures were lower in early trading Thursday on the Chicago Board of Trade. Sept. corn was off 2 cents at $5.12 a bushel. Sept. wheat fell by 1.5 cents at $7.29 a bushel. Sept. oats was down 1.25 cents at $3.32 a bushel. Sept. soybeans was down 3.75 cents at $12.51...