Growth of Four Northern Conifers under Long and Natural Photoperiods in Florida and Wisconsin
Abstract: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.
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: March 1, 1963
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