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Scott's book does not list the ideal levels of the various nutrients, except for calcium.
Based on the study by Bob Beyfuss,Scott says:
\"If your initial soil analysis shows calcium levels below 1000 pounds per acre, then add 100 pounds Gypsum per 1000 sq. feet onto the bare soil, immediately after your initial fall seeding and just before mulching. Calcium leaches out of the soil, and other woodland plants as well as your ginseng will probably utilize any added calcium. Take an annual soil sample in late winter. Whenever calcium is less than 2000 pounds per acre, top dress your wild-simulated site with 50 pounds of gypsum per 1000 sq feet of planted area just before the plants begin their season's growth in the spring. If calcium is 2000 pounds or higher, do not add gypsum, unless either your plants ar not growing vigorously, or you see evidence of disease in your planting. Calcium is a crucial element in fighting disease at the cellular level, and adding a little extra during the growing season at the 50-pound rate is not likely to hurt and might help significantly.\"
Also check out what Beyfuss had to say about low PH in relationship with calcium and phosphorous. Half way down the page under: Soil Management For Wild Simulated Ginseng Crops
pubs.ext.vt.edu/354/354-312/354-312.html
I know a few of the sites I have seng growing, had soil tests showing calcium levels around 900 pounds per acre. So I broadcast 10 lbs gypsum per 100 sq ft of area before I raked the leaves back on after planting seeds. Then in the spring I spread the same amount on top of the leaves before the plants emerged. After a second soil test the calcium levels were about 3200 lbs per acre. And the plants are growing great with no disease. If the calcium level was 4000 or higher that would be even better.
Gypsum will not raise your PH. So if your ph is within the correct range, thats the way to go.
Scott says ph sould be:
\"Where the ph is in the range of 5.0-6.7, the nutrients that ginseng needs are available and bacterial diseases are frustrated, leaving only fungi to threaten the plants.\"
Hope this all makes sense.
classicfur