Hunter,
Found the info below online...
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Fresh vs. composted manure.
Fresh, non-composted manure will generally have a higher N content than composted manure. However, the use of composted manure will contribute more to the organic matter content of the soil. Fresh manure is high in soluble forms of N, which can lead to salt build-up and leaching losses if over applied. Fresh manure may contain high amounts of viable weed seeds, which can lead to weed problems.
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If I was going to use manure at all, it would be composted and aged. For example if you could mix together maple leaves and some of your chicken/rabit manure, and perhaps some gypsum and let it compost for several months, turning it to make sure it cooked down good (killed the seeds) and breaking down the high N in the manure, then you should have a nice mix to try out as a top dressing for your seed bed.
The main concerns with using manure at all would be the N content and seeds in the manure which will germinate if not composted.
Too much N on ginseng would make the tops/leaves grow more than normal, and could lead to more foliage type disease issues.
TNhunter