RE: Turnips...
The pelletized lime actually goes to work faster than Ag-lime. You should be good on that.
That is alot of deer per square mile!! It might be possible for the turnips to have a chance to achieve maximum growth before heavy browsing occurs, if the deer feed in the crop fields in early fall.
The Purple Top Turnip/Dwarf Essex Rape mixture was used in this area for hog pasture years ago, I'm not sure exactly what the estimated tons per acre is, but it is substantial. I will see if some of these hybrids produce more.