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Growth of Four Northern Conifers under Long and Natural Photoperiods in Florida and Wisconsin

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Seedlings of Pinus strobus L., P. resinosa Ait., Picea glauca (Moench) Voss., and P. mariana, Mill.) B.S.P. were grown under natural and 20-hour photoperiod from seeds collected in Wisconsin and Minnesota. Long photoperiod permitted growth throughout the 226-day growing season of Florida, producing seedlings that at the end of 2 years were equal to or exceeded the standards for northern-grown transplants; outplantings in the North survived as well as stock from local nurseries. The relatively short natural photoperiod of Florida caused dwarfing of the seedlings. Extended photoperiod in Wisconsin increased the size of 2-year spruces. At both locations, the pines formed precocious secondary needles and the spruce more and longer lateral branches under long photoperiod. Long photoperiod influenced the pattern of growth; the pines grew intermittently the second season but the spruce without interruption both seasons until the end of long-day treatment.
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Document Type: Journal Article

Affiliations: Formerly Tree Physiologist with the U. S. Southeastern Forest Expt. Sta., is now on the faculty of the Dept. of Forestry, Clemson Agric. College, Clemson, S. C.

Publication date: 1963-03-01

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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.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
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