CHICAGO, June 29 (ABC): Chicago Board of Trade (CBOT) agricultural futures fell across the board on Thursday, led by corn. The most active corn contract for December delivery plunged 38.25 cents, or 5.51 percent, to settle at 6.555 U.S. dollars per bushel. September wheat fell 39.5 cents, or 3.99 percent, to settle at 9.4925 dollars per bushel. November soybean lost …