Douglas-Fir Seedlings Have Roots?
Survival of field planted Douglas-fir seedlings in California has always been erratic. One cause of this may lie in the root regenerating potential of the seedlings. This article reports on the root regenerating potential as related to time of nursery lifting, and to cold storage. Seedlings were lifted at four-week intervals, beginning in late October and ending in mid-April. Half of the seedlings were placed in 1°C cold storage after each lifting. The remainder were planted in soil trays, and the trays placed in a 20°C controlled temperature waterbath. After one month the seedlings were gently washed out of the soil and the following data recorded: seedling alive or dead; if alive, the number of new roots less than 0.5 inch long and the number of new roots 0.5 inch or longer. After three months in cold storage, the root regenerating potential of the stored stock was determined in the same way. Results showed that, for all dates, fresh lifted stock survived better than stored stock. However, both fresh lifted and stored stock had the highest survival after mid-December. All stock lifted after mid-December and before mid-April, that survived, developed new roots. Almost all stock lifted after mid-January and not later than mid-March developed some new roots over 0.5 inch. In total number of new roots, fresh stock was superior to stored stock.
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Document Type: Journal Article
Affiliations: Nursery Forester, Ben Lomond State Forest Nursery, South of San Francisco, Calif.
Publication date: 1964-08-01
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