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If by "electric poultry fencing" you mean electronet, then I would say No, you don't need it and it'd be WAY more aggravation than it could ever possibly be worth in your situation.
If however you mean just "adding a coupla hotwires to your existing fence", then I would say that only you can tell whether you NEED it, but it can't *hurt*. Basically it will be giving you extra margin of error against coyotes and foxes and loose dogs which might otherwise wish to dig under (or in the case of grey foxes and some dogs, climb over) your fence. Since your field's fencing probably cannot easily be digproofed otherwise, electric might be of some value. OTOH only you know how many coyotes, foxes and loose dogs you're likely to have, and how motivated they're likely to be (which depends onthings like how many other ways there are locally for them to get food, and how visible the chickens will be from the fenceline)
If you do want to add hotwires to your existing field fence, what you would probably want to do is run one wire (on a 3" standoff insulator) as low as you can get it without risking it grounding out from sag or from weed growth -- you will have to keep the weeds whacked down regularly though -- and another one on the same standoff insulators up near the top of the fence. Get a GOOD digital fence tester, not one of those four-neon-lights jobbies which are just way too inaccurate, and test the fence every day or two to make sure it is running at about 4,000 v. It would not hurt to tie the metal mesh of the fencing into the ground terminal of the charger (as well as using a regular ground rod or three, I mean).
Good luck, have fun,
Pat
