If you already have an established hay operation on your place there is one ag crop that you could plant and keep that field in hay production. Alfalfa. A pure stand of Alfalfa is hard for the average food plotter to keep due to the need to cut it for hay a number of times during the summer, but you have that covered. Alfalfa can be smothered easily which is why it needs to be hayed. Also you would see a return on your initial outlay for stand establishment.

I have 8 acres of alfalfa on my cattle farm and I often see deer in it during the middle of the day. I saw 9 deer in it 2 evenings ago. Deer love alfalfa.

Just a thought.