As the hot, dry, record-breaking summer of 2012 concludes, it is obvious that the corn crop is maturing more quickly that normal. Many fields were off to a great early start, and the excessive heat, and heat unit accumulation, is driving the crop towards what is perhaps a very early harvest. Already one can see fields that are mature. Producers are talking about harvesting their earliest crop ever. Many are interested in estimating the yield of their fields, so as to aid in their harvest activities and also adjust their marketing plans.