"So 1.25 cubic feet of ear corn weighs 72 lbs compared to 1.25 cubic feet of shelled corn weighing 56 lbs?"

No, that is not what I said..... or least not what I intended to say.

What I said is that 70.7 lb (or 72 lb) is the weight of ear corn which will equal 56 lb of shelled corn, which is considered 1 bushel of shelled corn.

I also said that 1.244 cu ft = 1 bushel, no matter what product you are trying to fit into that space of 1.244 cu ft.

Intuitively, you can imagine the amount of space that would be found in trying to get ear corn into 1.244 cu ft.

You need to go back and think in terms of lbs of corn harvested per acre, which is really what you sell.  The only reason "bushels" comes into play is because in the USA we price corn based on bushels, not lbs.  If we would pay price on lbs, or tons, the term "bushels" would be a non-issue.

So, thinking in terms of lbs,  for every 70 lbs of ear corn @ 15.5% - and I am going to use 70 lbs (see links I posted above) - you will get 56 lbs of shelled corn @15.5%, and 14 lbs of cob.  It is as easy as that.

So, if you harvest 8400 lbs of dried shelled corn, you should get 2200 lbs of cob.

8400 lb x 70.7 / 56 = 10,600* lb

10,600* lb - 8400 = 2200* lb

* - these numbers are rounded off.