Free: Contests & Raffles.
As long as its standard agriculture practice its legal. I'm assuming the corn was combined, and the field was tilled after. Shoot away
Confirm that scattered seeds or grains on agricultural lands are present solely as the result of a normal agricultural planting, normal agricultural harvesting, normal agricultural postharvest manipulation, or normal soil stabilization practice by consulting the Cooperative Extension Service.
If the corn wasn’t harvested, and he just tilled it up, I don’t believe that is legal. Some guys got busted out Nisqually years ago for a similar situation.
The corn was not harvest it was just rototilled under.
I'd hammer the place until nothing ever came back, and not worry one bit. If folks can get away with flooding the fields, using electric ice eaters, and charging cash, then I'd say 'my property, my rules'. Getting to where I don't give a rat's A anymore.