December corn opened 4 cents lower on the day at 372 1/2 and established an early range of 368 1/4 to 373. Corn opened below yesterday's lows and then extended its losses in the first minutes of the day session. Traders said that a sharply lower crude oil market and ongoing expectations of favorable harvest weather are generating selling by locals, funds and commission houses this morning. Cash market traders indicate that more corn has come into the supply pipeline in the US this week with the pace of farmer selling expected to increase in coming days and weeks. One cash trader noted that this is the sort of selling that normally would have occurred 1-2 months ago if weather had been normal going into harvest. Analysts are expecting the USDA to drop the corn yield by about 1 bushel per acre on Tuesday's Crop Report. This compares to 164.2 bu/acre on the October report. This would result in a drop in production of about 80 million bushels from the October production total of 13.018 billion bushels. Most production estimates, however are down about 25 million bushels with a very wide range due to the lack of harvest progress. Ending stocks for corn in 2009/10 are expected to be near 1.625 billion bushels versus the October stocks number of 1.672.