good post farman.... but the 2004 corn crop figure of 160bu was for the Main corn crop area... and before the ethanol demand boom... no?
152 or 156 bu in a Great weather year in Places like IA ILL NEB IND MO OH sure I can see that... again assuming a good / normal weather se ason.
but to get 160 bushel yield in western ND western SD? KS? ARK? MS or LA??