A Solution Culture Method for Growing Uniform Ash and Maple Seedlings
FORT DETRICK FREDERICK MD
Pagination or Media Count:
The study evaluated methods and established procedures for growing seedling trees to a predetermined uniform size. White ash Fraxinus americana L. seed gathered in the fall from indigenous sources was placed in a cool-moist environment for 90 days to break embryonic dormancy. Red maple Acer rubrum L. and silver maple Acer saccharinum L. were similarly obtained in the spring but did not require a cold treatment. Seeds were germinated in vermiculite, a 11 peat-perlite mixture, and washed silica sand in the greenhouse and in a growth chamber. Following emergence, the seedlings were grown for various periods in a growth chamber in nutrient culture as well as in the above media in the greenhouse under supplementary light. In contrast, dormant ash and maple seedlings were obtained commercially and exposed to various photoperiods. Daylengths of 16 and 20 hours were used in the growth chamber studies. Greenhouse photoperiods of 16, 20, and 24 hours were achieved by supplementing the natural day of 10 to 11 hours with increments of fluorescent or incandescent light.
- Anatomy and Physiology