Breaking News-RTRS-PREVIEW-USDA to confirm thin US soy stocks, big grain build

By Christine Stebbins
CHICAGO, Sept 28 (Reuters) - Red-hot demand for U.S. soybeans from China during 2009 have likely drawdown soy stocks to their lowest level in three decades, while corn and wheat stocks are building, analysts said.
The U.S. Department of Agriculture will report on Wednesday at 8:30 a.m. EDT (1230 GMT) the amount of soybeans, corn and wheat held by farmers and grain firms on Sept. 1. While the quarterly grain stocks report typically is not a market shaker, it sets the stage for the upcoming season for corn and soy.
Sept. 1 marks the start of the 2009/10 marketing year for both, so the quarterly stocks data becomes the official year-end data. Currently, USDA in its Sept. 14 supply/demand report estimated corn 08/09 end-season stocks at 1.695 billion bushels and soybeans at 110 million.