Germination and Growth of Three Tree Species under Four Photoperiods
The effects of four photoperiods: [natural (3.7 hours), 8, 8+2, and 16 hours] was determined for Caragana arborescens, Picea pungens, and Pinus sylvestris (2 seed sources). Germination capacity of the seed was not influenced by the photo-periods tested, but rate of germination was increased for all three species by the 16-hour photoperiod. Caragana seedlings grew continuously under short- and long-day photoperiods, the rate of growth being directly proportional to the photoperiod. Growth of Picea and Pinus seedlings was continuous only under the 16-hour photo-period, but terminated under 8 and 8+2 hour exposures. Response of Pinus seedlings to photoperiod exposures was conditioned to some extent by geographic origin of the seed. All three species of trees could be sown and cultured under 16-hour photoperiods for winter forcing in a tree breeding program.
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Document Type: Journal Article
Affiliations: Technician Forest Nursery Station, Canada Agriculture, Indian Head, Saskatchewan
Publication date: 1963-09-01
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