Initial Growth of Fraser Fir Seedlings at Different Day/Night Temperatures
Four-week-old Fraser fir (Abies fraseri (Pursh) Poir.) seedlings were grown in controlled-environment chambers for 17 weeks at day temperatures of 18°, 22°, 26°, and 30°C in factorial combination with night temperatures of 10°, 14°, 18°, 22°, 26°C. Temperature optima depended upon the growth parameter: height above cotyledons (30°/18°C), stem cross-sectional area (22°/26°C), root dry weight (26°/10°C), shoot dry weight (18°/22° and 22°/26°C), and total dry weight (26°/14°C). Shoot/root ratios decreased rapidly for night temperatures below 14°C, and were highest for 30°C days in combination with 18° to 22°C nights. Day temperatures approaching 30°C increased height growth, but reduced total dry weight, root dry weight, and stem cross-sectional area. Day temperatures of 22° to 27°C and night temperatures of 13° to 19°C appear optimal for containerized Fraser fir seedlings during active growth. Forest Sci. 27:545-550.
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Document Type: Journal Article
Affiliations: Assistant Professor, Department of Horticultural Science, North Carolina State University, Raleigh, NC 27650
Publication date: 1981-09-01
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