Controlled-temperature, aboveground stratification of North American ginseng seed
2001
Proctor, J.T.A. | Louttit, D. | Follett, J.M.
Freshly harvested, immature (green) seeds of north american ginseng (Panax quinquefolius L.) were stratified for 12 months either traditionally in buried wooden boxes outdoors, or in plastic pails in a controlled environment room [3 +/- 0.2 degrees C (37.4 +/- 0.11 degrees F)], 85% +/- 5% relative humidity) for about 9 months followed by about 3 months at 20 +/- 2 degrees C (69.8 +/- 1.1 degrees F). Embryo growth in Stage II (mid-May to late August when direct seeded) was more rapid [0.016 versus 0.009 mm(.)d-1 (0.00062 versus 0.00035 inches /day)] under controlled-temperature conditions. Seedling emergence rate did not vary between treatments. Root dry weight (economic yield) was similar for seedling, 2, 3, and 4-year-old plants whether grown from traditionally or controlled-temperature stratified seed. Controlled-temperature stratification of north american ginseng seed is an acceptable alternative to traditional outdoor, in-ground stratification.
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