Our state has county agricultural offices that are an extension of Clemson University (ag based) that will do soil samples. Our former farmland (now planted in tree farms) was excellent, as long as we rotated crops every so often. The legend in our county was that we didn't sell land by the acre, but by the pound. We have excellent, fertile soil here. And apparently the same for trees. We have a hybrid super-tree nursery (originally International Paper) a quarter mile from one of our tracts. The site was chosen as the best they could find in the nation for pine growth.