RE: field cover
You have to be a bit careful - it depends on the terrain and surrounding field habitat - but "Screening Cover" can sometimes make a deer avoid a field if they feel "boxed in". Keep that in mind - you know the area best and can probably make that judgement. I like to leave the "area of concern" - (usaually a roadway) open for scrutiny by the deer - (I don't always do this - but in some cases its been needed).
Personally - I like splitting a large field - Offer a hedgerow (pines, spruce, hardwoods, etc) - Make it 40 yds wide and it may not have to go all the way across. I don't like fields less than 2 or three acres - and except for a quick snack - I feel deer do not like small plots either. I've been splitting up a 20 acre field the last few years with corn, trees, grasses, and Rye - with some early success - I hope for more as the trees grow (over 1000 pines and spruce).
A "point" of cover extending into a field from a bedding are - is a good option too.
Good luck