RE: Turnips?
Yes, turnips are used in several food plot seed blends. The blends that I planted in the spring were left alone until late August/early September and then the deer cleaned them out.
I planted more this fall and my son shot a doe that had been feeding in them on Saturday.
Whether or not you can still plant them this fall depends on where you live. You would have to go by the seed companies recomendations on planting dates.