I have worked on a corn seed farm detassling odd rows of corn. It is every other row for seed hybridization. The rows were marked, but it was pretty obvious because the two heirloom varieties were distinct. If there were more that two varieties, it is not seed production.

I used to live in a town in farm country and saw a lot of it from the back of a bicycle. There’s not much to look at when the corn is high except the corn. I don’t know if things have changed in the last couple of decades but it was pretty common for detassling to remove the pollen from four or five rows at a go, rather than odd/even pairings.

This. The big clue is signs for a seed company.

As a teen I detasseled corn for a couple of summers - pulling the male tassels off the female rows of corn to create hybrids.