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Effects Of Stratification Temperature And Geographic Origin On Laboratory Germination And Subsequent Growth And Survival Of Douglas Fir In A Nursery
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Book Synopsis Effects of Stratification, Temperature, and Geographic Origin on Laboratory Germination and Subsequent Growth and Survival of Douglas-fir in a Nursery by : Mark A. Diegan
Download or read book Effects of Stratification, Temperature, and Geographic Origin on Laboratory Germination and Subsequent Growth and Survival of Douglas-fir in a Nursery written by Mark A. Diegan and published by . This book was released on 1991 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Watering Treatments on Germination, Survival, and Growth of Rocky Mountain Douglas-fir by : Daniel L. Noble
Download or read book Effects of Watering Treatments on Germination, Survival, and Growth of Rocky Mountain Douglas-fir written by Daniel L. Noble and published by . This book was released on 1978 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Master's Theses Directories written by and published by . This book was released on 1992 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Douglas-fir in Northern California by : R. O. Strothmann
Download or read book Douglas-fir in Northern California written by R. O. Strothmann and published by . This book was released on 1972 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Field Survival and Growth of Douglas-fir by Age and Size of Nursery Stock by : James W. Edgren
Download or read book Field Survival and Growth of Douglas-fir by Age and Size of Nursery Stock written by James W. Edgren and published by . This book was released on 1977 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stratification Period and Germination of Douglas-fir Seed from Oregon Seed Orchards: Two Case Studies by : Frank C. Sorensen
Download or read book Stratification Period and Germination of Douglas-fir Seed from Oregon Seed Orchards: Two Case Studies written by Frank C. Sorensen and published by . This book was released on 1991 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Seedbeds on Germination and Survival of Douglas-fir by : Richard K. Hermann
Download or read book Effect of Seedbeds on Germination and Survival of Douglas-fir written by Richard K. Hermann and published by . This book was released on 1965 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Germination and survival of Douglas-fir on seedbeds of unburned, lightly burned, and severely burned soil, charcoal, litter, and sawdust, exposed to 100, 75, and 25 percent of full light, were studied on a south-facing clearcutting in the Coast range of Oregon. Irrespective of exposure to light, germination was best on charcoal and on severely burned soil, which was attributed to prolonged preservation of moisture at the surfaces of these materials. Differences in germination among these two and other seedbeds were statistically significant. The initial advantage of high germination on charcoal and severely burned soil was still apparent after six growing seasons. Stocking of trees remained highest on these seedbeds in spite of considerable mortality in the first growing season. Loss of seedlings was severe during, and shortly after, the period of germination. Then mortality decreased and became insignificant in following years. Rodents, heat, and damping-off, in this order, were the major causes of mortality. Heat was the predominant cause of mortality in the open, but rodents and damping-off fungi took the heaviest toll in shade. A preference of rodents for particular seedbeds was not apparent. To what extent mortality by heat and by damping off reflected influence of seedbeds could not be determined because of the confounding effect of rodents. Almost daily, temperatures of 1400 F (600 C) were maintained for 2-5 hours at the surface of seedbeds in the second half of the first growing season. Perhaps because of hardening of seedlings, mortality by heat decreased steadily in spite of increase in temperatures in the latter half of the season. Pronounced differences were not found in rate of depletion of moisture in the soil underneath various seedbeds. The supply of moisture became critically low only for a short period at the end of summer, apparently a consequence of absence of herbaceous vegetation. Growth in height of seedlings and development of their roots in the first year seemed to be unrelated to characteristics of seedbeds. Results of the present study are considered to be representative of initial development of Douglas-fir seedlings on south-facing clearcut areas in the Coast range of Oregon, provided germination occurs early and competing vegetation is absent."--Summary.
Book Synopsis Influence of Date of Cone Collection on Douglas-fir Seed Processing and Germination by : Donald L. Olson
Download or read book Influence of Date of Cone Collection on Douglas-fir Seed Processing and Germination written by Donald L. Olson and published by . This book was released on 1975 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Douglas-fir in Northern California by : R. O. Strothmann
Download or read book Douglas-fir in Northern California written by R. O. Strothmann and published by . This book was released on 1972 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Douglas-fir Survival and Growth in Response to Spring Planting Date and Depth by : R. O. Strothmann
Download or read book Douglas-fir Survival and Growth in Response to Spring Planting Date and Depth written by R. O. Strothmann and published by . This book was released on 1971 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermoperiods and soil temperatures as they affect growth and dormancy of douglas-fir seedlings of different geographic origin by : Denis P. Lavender
Download or read book Thermoperiods and soil temperatures as they affect growth and dormancy of douglas-fir seedlings of different geographic origin written by Denis P. Lavender and published by . This book was released on 1972 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impacts of Nursery Processing on the Survival, Growth and Physiology of 2+0 Douglas-fir Seedlings by : Robyn Lea Willey Darbyshire
Download or read book Impacts of Nursery Processing on the Survival, Growth and Physiology of 2+0 Douglas-fir Seedlings written by Robyn Lea Willey Darbyshire and published by . This book was released on 1982 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study compared three nursery handling processes from the time just before lifting to the time seedlings are placed in cold storage after grading, sorting, and packing at the nursery. The seedlings handled in these different ways were compared first in terms of the temperature and plant moisture stresses they experienced during nursery handling. A second study of their growth and survival in a plantation and in an irrigation experiment was undertaken. The three treatments were: (1) conventional nursery handling with seedlings held for 48 hours in a cool, humid room (about 40°F and 80-90% relative humidity) between lifting and grading; (2) conventional nursery handling with seedlings held outdoors on a covered dock for 48 hours between lifting and grading; (3) bedpacking, where seedlings are lifted and taken directly to cold storage without the extra help handling involved in grading, sorting, and packing. The comparison of different temperature and plant moisture stress at the nursery showed no difference in plant moisture stress (PMS) during the holding period for treatments (1) and (2). Treatment (1) however did keep the seedlings at a lower temperature than (2). Treatment (3) had the lowest PMS and temperature during the holding period. Seedlings planted in a plowed field in a split-plot design showed no significant differences in budbreak, rate of height growth, or survival due to handling treatment after one growing season, but bedpack seedlings showed significantly larger (p=0.01) new terminal length and dry weight than the other two treatments. Though not significant, the same trend occurred for dry weight of new laterals and total shoot dry weight. Seedlings planted in the irrigation study showed significant differences in budbreak, height growth, survival, and final morphology due primarily to the level of irrigation. More work at different nurseries and in different outplanting environments is needed before strong recommendations can be made about bedpacking versus conventional handling. Greater attention to the management of temperature and plant moisture stress during nursery handling may eliminate differences between conventional handling and bedpacking.
Book Synopsis Effect of Field Stratification on Douglas Fir Seed Germination by : Denis P. Lavender
Download or read book Effect of Field Stratification on Douglas Fir Seed Germination written by Denis P. Lavender and published by . This book was released on 1958 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Response of Douglas-fir Seedlings to Nitrogen, Sulfur, and Phosphorus Fertilizers by : M. A. Radwan
Download or read book Response of Douglas-fir Seedlings to Nitrogen, Sulfur, and Phosphorus Fertilizers written by M. A. Radwan and published by . This book was released on 1985 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.) Publisher : ISBN 13 : Total Pages :35 pages Book Rating :4.:/5 (255 download)
Book Synopsis Douglas-Fir in Northern California by : Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)
Download or read book Douglas-Fir in Northern California written by Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.) and published by . This book was released on 1972 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Watering Treatments on Germination, Survival, and Growth of Rocky Mountain Douglas-fir by : Daniel L. Noble
Download or read book Effects of Watering Treatments on Germination, Survival, and Growth of Rocky Mountain Douglas-fir written by Daniel L. Noble and published by . This book was released on 1978 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Temperature Effects on the Growth of Douglas-fir Seedlings by : Donald Everett Wommack
Download or read book Temperature Effects on the Growth of Douglas-fir Seedlings written by Donald Everett Wommack and published by . This book was released on 1964 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was undertaken to determine the effects of different chilling treatments during the dormant season upon growth of Douglas-fir seedlings0 In addition it was planned to determine whether seedlings native to various geographic areas differ in their chilling requirements0 The hypotheses were advanced, based on previous studies, that chilling at near L & 00F. was more effective in satisfying the chilling requirement of plants than chilling at temperatures near 32°F., or 50°F., and that plants native to areas of low elevation, characterized by mild winters, require less chilling than plants native to areas of high elevation characterized by long and severe winters. Verification or rejection of these hypotheses was undertaken by subjecting dormant seedlings of Douglas-fir, native to several geographic areas, to chilling under different temperature treatments for different lengths of time. Experiment I was designed to compare the effects of chilling for three, six, and twelve weeks at various temperatures (32, L & 0, 50, and 60°F., and out-of-doors) on two-year-old seedlings from eight geographic areas. After chilling, they were moved to a warm greenhouse and exposed to short days (nine hours). The effectiveness of the treatments in breaking dormancy was expressed in number of days from end of treatment to bud burst, percentage of plants which broke dormancy, and amount of shoot elongation. In general 40°F. was the most effective treatment followed by 32°F., out-of-doors, 50, and 60°F., in that order. The latter temperature had little or no effect in breaking dormancy compared with the other treatments. Twelve weeks of chilling were more effective than chilling for shorter periods at all temperatures except 60°F. At six weeks 40°F. was the most effective treatment, 32°F. was less effective, while 50, 60°F., and out-of- doors treatments were ineffective in breaking dormancy. Four weeks of chilling were ineffective regardless of the chilling treatment. Genetic differences were observed among the plants from the eight areas chilled at 40°F. for twelve weeks. Plants native to the highest areas represented in the experiment resumed growth earlier than those from the lower elevations. Experiments II and III differed from Experiment I since the dormant seedlings had germinated and grown only about three months prior to chilling. In these experiments plants were chilled for four, eight, and twelve weeks. After the chilling period half of the plants were grown under long days (normal days plus two hours of artificial light) while the other half were maintained on short days (nine hours). The results of Experiment II were similar to those of Experiment I with respect to the greater effectiveness of 40°F. compared with the other temperature8. Long days seemed to compensate for lack of adequate chilling except in plants chilled for twelve weeks at 40°F., indicating that the chilling requirements of these plants had been more adequately satisfied than by any of the other treatments. Experiment III was designed to compare the effectiveness of chilling under fluctuating day and night temperatures with that of chilling at a constant temperature. Fluctuating day and night temperatures of 40/32°F. (40°F. day, 32'F. night) were about as effective as continuous chilling at 32°F. or 40°F. Fluctuating temperatures of 50/32°F., and 50/40°F. appeared to be about as effective as continuous chilling at 50°F. Chilling at 50°F. during the day, irrespective of the temperature during night, delayed bud burst in comparison with chilling at 32, 40, or 40/32°F. Genetic differences were observed among the plants from the different areas in Experiments II and 1110 Plants native to high elevations (6000' elev.) resumed growth in lower percentages, resumed growth later, and grew less than plants from tower elevations (3000' and 3600' elev.). The principal contribution of this study has been the demonstration of differences in effectiveness of several chilling treatments in breaking the dormancy of seedlings. Variations in the chilling requirements of seedlings native to different areas has also been shown.
