My Experience with Alfalfa (Comprehensive)
I think I'm in a position to answer my own question at this point (I don't mind talking to myself as it is).
I planted equal parts multi-leaf and grazer varieties of alfalfa from Welters, per Welters recommendation for food plot purposes, on August 28, 2021. Seeded at a rate of 20lbs per acre, I also seeded chicory into the alfalfa. I chose to establish a pure stand of alfalfa (excepting chicory) as most blends I have seen that contain alfalfa seem to lose their alfalfa to clover over time.
My soil started at a PH of 6.4 so I previously added ag lime, pelletized lime, and crushed lime. I used all three because I changed the layout so I had to keep adding lime. I also added some 19-19-19 and some extra "P" and "K" before planting. Ground was formerly cattle pasture, I mowed, sprayed, burned, disced, tilled, and used a leveling implement. I seeded then cultipacked. The ground was fairly firm before seeding otherwise I would have cultipacked before and after seeding. I did not use a nurse crop with alfalfa. This plot is located in Hancock County, Illinois.
We had a good rain within a week of planting that allowed the seed to germinate. It then became unseasonably hot and dry for the next 45 days. I attempted to water the plot twice with a fairly elaborate setup that was time consuming and I'm not sure if it helped. Regardless, the rain came and the alfalfa flourished. The alfalfa sprouts tolerated the hot and dry conditions better than the white clover sprouts. It was highly selected by deer all hunting season, even through the snow.
The alfalfa came back in the spring early and vigorously. I sprayed in May with a grass selective herbicide. I had the plot mowed around the 4th of July and was concerned that it would smother from the debris. However, it did not and is coming back quite nicely. However, I may consider mowing it sooner next year.
Alfalfa probably outclasses clovers in attraction when both are actively growing. If I was in a high deer density area, I would definitely consider alfalfa as its growth is phenomenal and I would be impressed with any deer herd that could keep a sizable plot in check. That being said, a small .25 acre plot would also be a good choice as it would still provide a lot of tonnage, but would be easier to maintain and get the soil conditions where they need to be. In extremely high deer density areas, it may be necessary to fence deer out of alfalfa initially.
I would assume the ongoing fertilizer needs of traditional alfalfa fields won't be necessary in my plot as the alfalfa (and nutrients therein) not consumed by deer is being returned to the soil. One could easily, per dbltree's recommendation, have the plot hayed with the farmer paying the costs of inputs, that option wasn't available to me.
I'm only a year in, but in my plot, it has been unnecessary to bale. This could be due to the varieties I used. I hope someone finds this post helpful and that it encourages some folks to plant pure alfalfa plots.