CHICAGO (AP) _ Grain futures were mostly lower in early trading Friday on the Chicago Board of Trade. Sept. corn lost 2.25 cents at $5.08 a bushel. Sept. wheat fell by 3.25 cents at $7.39 a bushel. Sept. oats was unchanged at $3.35 a bushel. Sept. soybeans was up 1 cent at $12.57 a bushel....