It isn't often the WPI defers to other sources, but the subject of trend line yields can be very confusing. We have pointed out on numerous occasions the importance of the 2012 corn yield to these markets. USDA and several others are using yield estimates as high as 164 bushels per acre in its preliminary 2012 corn production estimates. The U.S. corn yield has only been 160 bushels per acre or higher twice. The first time was in 2004 and the last time was in 2009. The 2010 yield was 152.8 bushels per acre and the 2011 yield was 147.2 bushels per acre. The difference between a 2012 corn yield of 164 bushels per acre and 155 bushels per acre could mean as much as $1.00 or more to prices. The term "trend line" is often used in yield discussi...