Corn on Corn

I just read some articles about the poor performance of corn following corn in some areas this year.  This should come as no huge surprise.  One of the things that researchers track long term is continuous corn and corn on corn rotations.  Results usually indicate something like  a 10% yield hit.  I have heard lots of people say they do not have that problem, but 6 years in a row with even performance and then a year with a 60 or 70 bushel hit would certainly set your average back at any yield  level.  Does this mean you should not grow long term corn.  Certainly you should consider the consequences.  We have one customer who has grown corn continuously since 1954.  Am I going to tell him to switch off?  I don't think so.  I look at what he is doing. He maintains high soil test levels.  He has well tiled fields.  I bet he watches which hybrids work best in continuous corn.  If you decide to go for it, do so with realistic expectations.  If you can't stand the risk, then switch to a corn soybean rotation.