Even though you will find insects on corn flowers they are prominently pollinated by wind. Corn should be planted in squares, not rows. I have tried over the past few years to plant 2 rows of corn but it just doesn’t work.
Unfortunately with poor pollination you get poorly developed ears. My conclusion is that for best results you really need to plant a good amount of corn for proper pollination to take place, each kernel is a flower that was pollinated, each empty space was a flower that was not pollinated.