One consistent factor with this year’s corn and soybean crops has been variability, and this hasn't ended with the advancing harvest. Yields vary across the Corn Belt by one of the largest margins in recent history. 

Poor yields have been reported in several regions of the United States, mainly where weather and quality issues have developed. The most notable of these has been in the Upper Plains, mainly the Dakotas. 

Regions of the United States that have been...