Answer: I think your problem is insufficient pollination. I'm not aware of any "photoperiod" requirements for corn, so I don't think that's the problem. However corn is usually planted in large blocks, so that the wind can freely distribute pollen all around. (Often the corn on the outer rows is small because of poor pollination.) So I think you need to be extra diligent to pollinate the corn. Wait until the tassls look loose and open. Shake the pollen into a paper bag, then sprinkle a little on the silks of each developing ear. That should do it!
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