I grow soybeans every year and have never applied manure to them. I can't even remember the last time I fertilized them.
It is amazing how different soils can be. Folks like me on marginal soils will never have the fertility of folks in the farm belt. With enough inputs, they can be quite productive, but that is far from my goal. Deer are browsers and food left in my plots at the end of the stress period that does not end up in their bellies, is not contributing to my primary deer management goal. It still helps with soil building.
A high input, maximum, yield approach is not for me. As long as I have sufficient quality deer food to cover stress periods, my food plot program is doing its primary job. If it provides attraction in the fields I target for hunting season, it is achieving its secondary goal.
As for soil building, my primary goal is to restore the damage tillage has caused to my marginal soils. With my heavy clay, some highly damaged fields still need minimum tillage (less than an inch) to break the crusting my clay often has. Some of my better fields don't require this, but the most damaged do.
When I first started to move in this more sustainable, soil health, direction, my hope was to be where you are now, growing soybeans without fertilizer. While soybeans are great nutritional deer food, they are hard to grow here with the browse pressure (candy crop) and summer weed competition. My only success with them has been RR beans with multiple applications of gly to deal with weed competition and volume to mitigate browse pressure. The frequent use of RR has advantages some noxious weeds like marestail. I'm not sure that I'll ever go back to soybeans. My use is for summer forage, not winter which is different in the north. I'm finding other crop combinations that have lower fertility requirements but still provide quality food and that compete better with weeds reducing my use of gly.
It has been, and continues to be a journey. I'm learning as I go and refining techniques. I'll never go back to traditional techniques. Lower input, more sustainable, techniques allow more money and time to be redirected to other habitat improvements without sacrificing quality deer food one bit.
Every place is different, and the details of the techniques need to be adjusted accordingly, but the concepts Ray Archuleta lays out seem to apply across the board.
Thanks,
Jack