If you don't have the time and all the equipment to plant and manage a foodplot, here's an option. Grain Sorghum.
This is a hardy plant/grain, mostly grown out west for making syrup, but is used by many outdoorsman for foodplots and cover. It's very easy to grow, with virtually no maintenance, and will not only offer food for deer, pheasants, doves, rabbits and other game, but also serves as outstanding winter cover. Sorghum is very heat tolerant, and can simply be broadcast over a tilled or disced field. Last year, I disced up about 2 acres of ground, broadcast the seed with a small lawn spreader, then ran the disc and harrower back over it. I planted in late May, and then forgot about it. It came up fantastic, and kept the weeds to a minimum. A bag (50lbs) usually runs about $60 dollars, and can cover up to 4 acres. You can normally buy this at your local grainery, or they can usually oder a bag for you if they don't have it in stock. You can plant this as late as mid July as well. Many people will even leave the previous years crop stand, as it will continue to benifit wildlife the following year.