I plant a small 1/4 acre patch every year. This year I just planted a 1/4 acre in one of the back corners of my upper field. Purple Top and Seven Top are really easy to get to grow even with my poor soil. My deer eat the tops all Fall and then dig the turnips up about this time of year. The seed is very small and you can plant a large area with just a few pounds.
FYI, on the land that I own, my deer love turnips, on my uncles farm 10 miles away, they wont even touch them. So its hard to say what your deer will or will not prefer.