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Effects of Lifting Date and Storage on 2+0 Douglas-Fir and Noble Fir

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To study the effect of lifting date and cold storage on planting stock, 2+0 Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) and noble fir (Abies procera Rehd.) were lifted at four-week intervals from October to May. Half of the stock was immediately outplanted and half was held for four weeks at 2°C. before planting. Sample seedlings from each group were studied in the laboratory; the amount of carbohydrate in the needles was determined and new roots were counted after four weeks in a controlled environment chamber held at springlike conditions. Survival of unstored stock for both species was 90 percent or better for most lifting dates; none was less than 70 percent. Stored seedlings of Douglas-fir had 98 percent survival when lifted between November and March; similarly, noble fir survival was 87 percent when lifted between October and February. Storage in the spring reduced survival more severely than did storage in the fall. Root development in the laboratory was low in both early fall and late spring. Stored seedlings produced fewer roots in the fall and spring than did unstored seedlings but at least as many as unstored plants produced during the winter. Of the carbohydrates studied, only non-reducing sugar content followed a definite trend--low in the fall, reaching a peak in February, and falling again in late spring. Thus, lifting date from October to April appears to affect seeding mortality only moderately when stock is handled carefully. Maximum and minimum survival generally relate to root development indicating that a better chance exists for seedling establishment when roots are active. Since nonreducing sugar content generally parallels survival and root development, it might be used as an index to favorable lifting dates.
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Document Type: Journal Article

Affiliations: Forest Technologist, Weyerhaeuser Company, Forestry Research Center, Centralia, Wash.

Publication date: 1963-09-01

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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

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