Bojow...
What type of ginseng do you plan on growing?
cultivated? woodsgrown? wild-simulated? or wild?
since you are wanting to know how much fertilizer to use it would be safe to eliminate wild and wild-simulated from this discussion right? Since you are growing in the woods it would also be safe to eliminate cultivated ginseng from the discussion. Now that we have zeroed in on the question. we can start to get some answers.
Unfortunately, other than that, I am afraid that i cant be of much help to you since i only grow wild-simulated ginseng, no chemicals, pesticides, herbicices or fungicides just like nature intended,
Good luck on your plantings. Hope i didnt confuse you more.