Yesterday's USDA supply and demand estimates should be considered at least somewhat bullish. U.S. ending supply estimates for corn, wheat and soybeans suggest farmers will again be scraping bin bottoms next summer before the 2013 crops are harvested. The world faces similar tightness with feed grain supplies stocks-to-use ratio at perhaps the lowest level ever. The chart below shows the world corn stocks to use ratio going back to the early 1980s.The markets reacted to yesterday's reports with sharply higher prices early, but they could not hold that buying enthusiasm into the close. Markets overnight and this morning were very weak. The fact that these markets have been unable to sustain any rallies for the past month has a lot of bulls...