The USDA's Outlook Conference is underway today. As usual, there are speeches and sessions covering a multitude of wide-ranging topics. Those of the greatest immediate interest to today's grain and soy markets concern USDA's projection of U.S. crop production prospects for the upcoming 2012/13 year and the related topics of demand and prices. USDA is more or less tied to using trend line yields in its calculations of production unless there is some strong reason to deviate from it weeks before spring planting begins. Trend line yields necessarily assume reasonably good weather during planting, the growing season and harvesting. Consequently, it is USDA's planted acreage projections that draw the most attention. Assuming USDA's projections...