(Recasts; updates prices, adds quotes, changes byline, changes dateline from previous PARIS/SINGAPORE)By Julie IngwersenCHICAGO, March 10 (Reuters) - U.S. corn and soybean futures each fell about 2% on Wednesday, a day after monthly U.S. Department of Agriculture (USDA) forecasts failed to offer fresh bullish news, freeing traders to book profits following recent multi-year highs, analysts said.Wheat futures also declined, following the trend, with beneficial moisture expected to bolster crop prospects in the U.S. Plains this week.