GRAINS-Corn edges lower on U.S. crop tour findings

SYDNEY, Aug 20 (Reuters) – U.S. corn futures fell on Wednesday, giving back all of the gains from the previous session, as findings from a widely watched U.S. crop tour reaffirmed bumper supplies. FUNDAMENTALS * Chicago Board of Trade December corn fell 0.2 percent to $3.71-1/2 a bushel, having gained 0.2 percent in the previous