Author: Van Buren Demick
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 100
Book Description
The Effect of Depth of Covering on the Germination of Douglas Fir Seed
Author: Van Buren Demick
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 100
Book Description
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 100
Book Description
Experiment Station Record
Author: United States. Office of Experiment Stations
Publisher:
ISBN:
Category : Agricultural experiment stations
Languages : en
Pages : 1074
Book Description
Publisher:
ISBN:
Category : Agricultural experiment stations
Languages : en
Pages : 1074
Book Description
Experiment Station Record
Author: U.S. Office of Experiment Stations
Publisher:
ISBN:
Category : Agricultural experiment stations
Languages : en
Pages : 1140
Book Description
Publisher:
ISBN:
Category : Agricultural experiment stations
Languages : en
Pages : 1140
Book Description
General Technical Report INT.
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 542
Book Description
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 542
Book Description
Journal of Forestry
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 602
Book Description
List of members of the society in v. 15-
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 602
Book Description
List of members of the society in v. 15-
Foundations of Silviculture Upon an Ecological Basis
Author: James William Toumey
Publisher:
ISBN:
Category : Botany
Languages : en
Pages : 476
Book Description
Publisher:
ISBN:
Category : Botany
Languages : en
Pages : 476
Book Description
Technical Note
Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 1052
Book Description
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 1052
Book Description
Effect of Light Quality and Periodicity Upon Germination of Douglas-fir Seed (Pseudotsuga Menziesii (Mirb.) Franco) and on Growth of Douglas-fir Seedlings
Author: Le Roy Curtis Johnson
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 170
Book Description
A study on the effects of light quality and periodicity on the germination of Douglas-fir seed and the growth of Douglas-fir seedlings was conducted. Interest was focused on responses that could be measured and observed without biochemical assay. It was found that .Douglas-fir seed, s would respond to red-light treatments by germinating and that this stimulating effect of red light could be reversed with far-red light. The phytochrome enzyme system is therefore undoubtedly present. The stimulating effects of red light on germination are influenced by the periodicity of the red-light treatment and temperature. Dry Douglas-fir seeds pre-treated with red light have significantly higher germination when compared to seed receiving no red light pretreatment, provided the seeds are germinated in absolute darkness but not if the seeds are allowed to germinate under "standard" conditions or when sown in the soil. Red light given during the dark period will maintain active growth in Douglas-fir seedlings, and far-red light will cause seedlings to go dormant. Red light is effective in breaking dormancy. as opposed to far-red light. Dormancy can be broken with far-red light breaks provided the dormant seedlings do not receive far-red light pre-treatment and/or provided the dormancy period is sufficiently long prior to the far-red light treatment for the seedlings to have a "dormant rest period". Blue light is also effective in breaking dormancy but red light is the most effective. When actively growing seedlings are irradiated with red and farred light for fifteen minutes in the middle of the dark period, red light has a strong influence on maintaining growth and far-red light has a slight influence on maintaining growth. Excessive amounts of far-red light will cause resumption of growth.
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 170
Book Description
A study on the effects of light quality and periodicity on the germination of Douglas-fir seed and the growth of Douglas-fir seedlings was conducted. Interest was focused on responses that could be measured and observed without biochemical assay. It was found that .Douglas-fir seed, s would respond to red-light treatments by germinating and that this stimulating effect of red light could be reversed with far-red light. The phytochrome enzyme system is therefore undoubtedly present. The stimulating effects of red light on germination are influenced by the periodicity of the red-light treatment and temperature. Dry Douglas-fir seeds pre-treated with red light have significantly higher germination when compared to seed receiving no red light pretreatment, provided the seeds are germinated in absolute darkness but not if the seeds are allowed to germinate under "standard" conditions or when sown in the soil. Red light given during the dark period will maintain active growth in Douglas-fir seedlings, and far-red light will cause seedlings to go dormant. Red light is effective in breaking dormancy. as opposed to far-red light. Dormancy can be broken with far-red light breaks provided the dormant seedlings do not receive far-red light pre-treatment and/or provided the dormancy period is sufficiently long prior to the far-red light treatment for the seedlings to have a "dormant rest period". Blue light is also effective in breaking dormancy but red light is the most effective. When actively growing seedlings are irradiated with red and farred light for fifteen minutes in the middle of the dark period, red light has a strong influence on maintaining growth and far-red light has a slight influence on maintaining growth. Excessive amounts of far-red light will cause resumption of growth.
Some Results of Cutting in the Sierra Forests of California
Author: Duncan Dunning
Publisher:
ISBN:
Category : Logging
Languages : en
Pages : 1502
Book Description
Pp. 24.
Publisher:
ISBN:
Category : Logging
Languages : en
Pages : 1502
Book Description
Pp. 24.
Effects of Watering Treatments on Germination, Survival, and Growth of Rocky Mountain Douglas-fir
Author: Daniel L. Noble
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 8
Book Description
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 8
Book Description