thanks sooooo much for the info I had no clue it was there.Have ye tried the Google?
Seems like this would be a good search "abandoned blueberry fields pine barrens nj".
It might lead you to this article:
It's picking time: Berry, berry good - Philly.com
...which might mention the "Franklin Parker Preserve".
And if you map that...you can see abandoned blueberry fields as far as the eye can see: