Breaking News-RTRS-PREVIEW - USDA may trim US soy stocks, corn flat

CHICAGO, March 5 (Reuters) - The U.S. Department of Agriculture (USDA) on Wednesday may reduce its estimate for U.S. soy carryout this marketing year (2009/10) which ends on Aug. 31 but may not change its outlook for the corn supply.
An average of analysts' estimates pegged the soy carryout or ending stocks at 194 million bushels, down from the USDA forecast in February for 210 million but above last year's carryout of 138 million, the tightest supply in decades.