As already mentioned, a 1/4 acre of soybeans will be decimated almost immediately. Truth ... last year the guys hunt with planted approximately 12 acres of Eagle Seed forage soybeans. The germination was great. At about 6"-8" high, looked like a lawn mower camr thoug field. Not a simgle plant ever got ove8" or so, and by July the entire field was barren of any signs of soy beans.
I would suggest you forget planting the 1/4 acre for the summer. Instead set up a feeder. Keep the 1/4 acre mowed. This fall, till and try a mix.
Sounds like the spot is heavily shaded. If this is the case, nothing much of any variety of food plot crop will grow well. Test the soil and correct the pH to about neutral (7.0). Maybe plant the whole plot in turnips and clover just for the winter crop???