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Effects of Auxin Treatment, Tree Age, Tree Vigor, and Cold Storage on Rooting Young Monterey Pine

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Cuttings were collected from 540 young trees throughout the native range of Pinus radiata D. Don. Recorded were timing of rooting, final percent rooting, cutting mortality, and roots per rooted cutting. These observations are analyzed relative to auxin treatment, tree age, tree vigor, time in cold storage, collection date, and population. Indelebutyric acid used as a rooting auxin increased rooting percentage, speed of rooting, and number of roots per rooted cutting, to a degree where its use would be practical. Rooting percentage and number of roots per rooted cutting declined with increasing age of the parent trees. The decline in rooting percentage with age was not as rapid in our data as that reported for most comparable forest tree species. Rooting percentage was only slightly, if at all, affected by vigor of the tree. Roots per rooted cutting likewise seemed unrelated to vigor. The number of roots per rooted cutting, particularly of auxin-treated cuttings, were inversely related to the time that a cutting took to root. P. radiata cuttings may be held in cold storage for periods up to and perhaps beyond three months without serious damage. Cold storage of 20 to 50 days may actually be beneficial, both in terms of subsequent speed of rooting, and number of roots per rooted cutting. Differences between populations in rooting percentage and number of roots per rooted cutting could not be conclusively shown. They appear to not be of overriding importance. As a tentative recommendation, late November through early December is a favorable time for collecting monterey pine cuttings in coastal California

Document Type: Journal Article

Affiliations: Graduate Student, Dept. of Genetics, Univ. of California, Berkeley, Geneticist, Pacific Southwest Forest and Range Expt. Sta., Berkeley

Publication date: December 1, 1966

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  • 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.
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