Browsing Theses, Dissertations and Student Research Papers (School of Forestry, pre - 1984) by Subject "Photoperiodism"

Now showing items 1-2 of 2

Effect of red and far-red light upon growth of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings

Dinus, Ronald John (1967-12-18)

The photoperiodic responses of Douglas-fir (Pseudotsuga menziesii (Mirb,) Franco) seedlings grown from seed collected at Salmon Arm, British Columbia, Coconino National Forest, Arizona, and Southern Vancouver Island were ...
Photoperiodic responses of Douglas-fir (Pseudotsuga Menziesii (Mirb.) Franco) and Ponderosa pine (Pinus ponderosa) seedlings

McCreary, Douglas D. (1976-04-21)

An important cultural tool in the greenhouse production of tree seedlings in the Pacific Northwest is the control of photoperiod. By artificially lengthening the period of daily exposure to light, it is possible to in ...