Hey Classicfur,
Looking around this morning online I found a nice article that talks about soil management for wild simulated seng. Below is the link to the full article.
pubs.ext.vt.edu/354/354-312/354-312.html
Below is the part where they are talking about the soil and importance of calcium - and they also mention phosphorous (recommended at 95 ppa). Konsoler did a 4 year study on that.
If someone did a study on how ginseng would react to boosting the levels of magnesium - they might just find that it also can make a nice difference.
Perhaps I will do that study myeslf on a few test beds
It would be nice to have a few beds side by side and over 4-5 years supplement some with gypsum only, and on others add some P and Mg and just see how they end up. Not sure I have the patience for that but will consider it.
TNhunter
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Soil Management For Wild Simulated Ginseng Crops
Once a potential site has been identified, a soil test should be taken. Dig up soil from at least six spots on the slope, mix it together in a plastic bucket and take the soil to your local Extension office so it can be mailed to the state soil test laboratory for analysis. When the soil test results come back, the most important numbers to look at for ginseng are the soil pH, available calcium (Ca) and available phosphorus (P). A typical pH from a soil sample taken from the forest floor from a north facing hillside in Virginia is 4.5. In the past, growers have been told to treat soil, with a pH that low, with lime to try to bring the soil pH up to 5.5 to 6.0 for ginseng production. Recent research by Bob Beyfuss in Greene County in the state of New York calls this practice into question. Mr. Beyfuss is an Extension Agent with Cornell Cooperative Extension who has a very strong interest in ginseng. In 1996, he recruited a team of ginseng hunters to assist him in a soil research program with wild ginseng. He asked these wild ginseng diggers to take soil tests wherever they found patches of wild ginseng growing well out in the woods. He got back 70 soil samples from them.
Beyfuss was surprised at the soil test results that came from this study. He said in his report, \"The most interesting and puzzling result of the analysis was the positive correlation of very low pH and very high levels of calcium. This is the exact opposite of what would be expected in mineral soils. The average pH for these samples was 5.0 + or - 0.7. Soils that are strongly acid such as this usually have calcium levels in the range of 1000 to 2000 pounds per acre or less. The average calcium levels in these samples (where ginseng was growing well) was 4014 + or - 1679. It is my suspicion that this abnormality may, in fact, be the key to the limited range of healthy populations of wild ginseng. Duplicating this soil condition may be the key to successfully cultivating American ginseng in a forested environment.\" (Beyfuss, 1997)
At the same time that Bob Beyfuss was testing the soils under wild ginseng stands in New York, Jim Corbin, a Plant Pest Specialist with North Carolina's Department of Agriculuture, was conducting similar research in the Great Smoky Mountains National Park in western North Carolina and East Tennessee. He conducted soil analysis from several wild ginseng stands and reported that, \"In ginseng, calcium deficiencies can be seen in stunted plants that lack general vigor. Growth buds are smaller and more fragile. In good ginseng stands, calcium on a per acre basis is consistently higher than in the other stand categories, and within these stands there was better plant diversity, less disease and a larger stem height in mature plants.\" (Corbin, 1997)
These two reports have caused controversy among ginseng growers and researchers. The new idea is to apply gypsum (Calcium sulphate) to soils for ginseng rather than lime (Calcium carbonate) which has been used in the past. The reasoning behind this is that the gypsum will add calcium but will not raise the soil pH. Rates as high as 5 pounds of gypsum per 100 square feet of growing bed have been recommended to bring the calcium levels up to 4000 pounds per acre. There are strong suspicions among several ginseng experts that ginseng diseases, like Phytophthora root rot, may be suppressed by acid soil conditions. There are strong suspicions among the same group that applications of lime to bring the soil pH up may lead to increased disease problems. Unfortunately, these suspicions have not been tested by replicated research studies. A few concerns about heavy applications of gypsum have been voiced by soil scientists. They are worried that growers may throw the soil fertility out of balance if they apply too much gypsum. Clearly, controlled research studies need to be conducted as soon as possible.
The other soil nutrient that ginseng growers should monitor is phosphorus. In 1978, Dr. Tom Konsler initiated a four-year study to measure ginseng root growth response to P additions to the low P soils found at the Mountain Horticultural Crops Research Station in Fletcher, N. C. Dr. Konsler found positive correlation of root weight with phosphorus additions. He also found that ginseng plants took up calcium more readily in soils that had available phosphorus so the interrelationship is important (Konsler, 1990). Growers should amend their low P soils so that at least 95 pounds per acre of actual phosphorus is available (Persons, 1994).
In the wild-simulated method, there is no tillage of the soil. Many persons recommend planting \"woods grown\" ginseng in tilled up, raised beds in the woods, under a natural canopy of shade. That method certainly can be used for production of ginseng but growers should not expect to receive high prices for roots produced in tilled beds. Ginseng roots harvested from tilled beds look like cultivated roots rather than wild roots. Prices paid for this kind of ginseng range from $30 to $100 per pound of dried roots. Since there is no tillage of the soil with wild simulated ginseng crops, all fertilizers are applied on the soil surface. Applications of gypsum and/or rock phosphate may have to be made every two or three years. Soil testing should be done every year to monitor available soil nutrients.