This aint Michigan, I got it, but when I was there last summer, if there was a soybean field, regardless of the time of day, there were deer in it. Soybeans don't improve the bottom line of deer camp economy, but you can bet they will be standing in it.
They also strip iron and clay peas (cowpeas).
You have to plant enough for them to hammer it and there still be enough left to keep growing. I have seen food plots mowed to the ground and then nothing left to to fight the drought that we used to have in the end of the summer and then no food plot for hunting over.