My first question is "why corn?" Of all the food plot options, corn is one of the more labor intensive. Plus, if you are in an ag. area, corn may not provide much variety.
I tried a small corn plot, about 1 acre, a few years ago and it flopped. I did not have the time or equipment to keep it weed free and by fall it was pretty weak. The fact that there were healthy corn and beans in every direction doomed my plot.
My second question would be, "what are you planting the plot for?" Is it for year round nutrition, is it to provide an anchor for your deer herd, or is it to hunt over.
All of these factors can determine what type of crop you put in, as they will attract deer with various degrees of intensity and at various times of year.