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Drying and Storing Stratified Ponderosa Pine and Douglas-Fir Seeds

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A procedure is described for air-drying stratified ponderosa pine and Douglas-fir seeds which may prevent losses due to germination during stratification and allow unused stratified seeds to be safely stored. Two ponderosa pine and three Douglas-fir seed lots were stratified, then dried to three moisture levels and stored at 2°C. Air-dried ponderosa pine seeds, with a moisture content of approximately 26 percent, were stored for 9 months without losing the beneficial effect of stratification or without their viability being adversely affected. A somewhat poorer response noted for Douglas-fir was attributed to a higher seed moisture content (approximately 37 percent) during storage. Oven-drying prolonged the storage life of both species over seeds which were not dried. Greenhouse and nursery sowings verified the laboratory results. Both species were germinated at 2° and 5°C. Speed of germination was slower at the cooler temperature, indicating the importance of maintaining precise temperature control to prevent germination during the stratification period. Forest Sci. 24:11-16.

Keywords: Pinus ponderosa; Pseudotsuga menziesii

Document Type: Journal Article

Affiliations: Seed Scientist, Weyerhaeuser Co., Centralia, WA 98531

Publication date: March 1, 1978

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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