Douglas Fir Seed from Young Trees
Abstract:Seed collected from trees less than 20 years of age is generally viewed with suspicion. Evidence has been obtained, however, which indicates that young Douglas fir trees are capable of producing important quantities of fertile seed, provided adequate cross-pollination can be obtained. The greatest danger lies in the collection of cones which have not been properly pollinated or which contain a large number of self-pollinated ovules, both conditions resulting in a large proportion of parthenocarpic, sterile seeds. This danger can be avoided by examination of sample cones and seeds prior to collection, by the use of cutting tests to determine the proportion of rifled seeds, and by keeping in mind the necessity for an adequate external source of pollen. Young stands, favorably situated with regard to pollen supply, may prove to be a cheap source of good seed.
Document Type: Journal Article
Affiliations: British Columbia Forest Service
Publication date: 1942-09-01
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