R little!
The laws on corn is you CAn hunt standing corn as long as its for farming. We have a form we grow corn and we can leave standing and flooded . As LONG AS you do not bush hog, run over or do anything else to its natural growing ability. Below is is one of our fields at the end of the year its not full and not much corn left but a little is still standing!
Basically its grows, it dies we, flood it. Many Many N La hunting lodges have corn. So simple so easy and mallards love it