Impacts of Nursery Processing on the Survival, Growth and Physiology of 2+0 Douglas-fir Seedlings PDF Download
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Author: Robyn Lea Willey Darbyshire
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 76
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Book Description
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.
Author: Robyn Lea Willey Darbyshire
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 76
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Book Description
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.
Author: Wade H. Shafer
Publisher: Springer Science & Business Media
ISBN: 1468449192
Category : Science
Languages : en
Pages : 314
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Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 28 (thesis year 1 983) a total of 10,661 theses titles from 26 Canadian and 197 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 28 reports theses submitted in-1983, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Author: Thomas Gary Daniels
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 172
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The effects of winter plant moisture stress (P145) on bare-root 2+0 Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings during nursery lifting and processing were studied. Seedlings were undercut at Ca. 4, 12, and 20 atm PMS during mid-February. Half of the seedlings undercut at 12 and 20 atm were not moistened after lifting (dry treated), the remaining seedlings received water sprayed directly on shoots and roots after lifting (wet treated). All seedlings were processed for field planting within six hours of lifting, and were cold stored for 55 days. Seedlings were planted in contrasting growth environments at two sites near Corvallis, Oregon, in early spring, 1977. Survival and growth were monitored during the first season after seedlings were planted under heavy and light irrigation, and with and without vegetative competition. The effects of winter PMS were highly associated with severity of the growing site. When moisture was not limiting, as under heavy and light irrigation schedules, treatment differences were small. Under non-irrigated field conditions treatment effects were significant. Wet treated seedlings produced significantly more height growth (9.0 cm vs 8.0 cm), and new foliage growth (5.70 gin vs 4.77 gin) than dry treated seedlings when grown free of vegetative competition. Survival without competition was excellent for all treatments ranging from 9% to 98%. On a site dominated by grass competition wet treated seedlings had higher survival (43% vs 23%), more height growth prior to mortality (7.6 cm vs 6.6 cm), and more new foliage growth (3.59 gin vs 3.07 gin). Seedlings which had early dates of bud burst survived better than those with late dates. Wet treated seedlings maintained better than average survival for later periods of bud burst than dry treated seedlings. The level of PMS at the time of undercutting had no effect on survival or growth when seedlings were moistened after lifting. However, dry treated seedlings undercut at 12 atm had better growth than those undercut at 20 atm when planted with competition. PHS of lifted seedlings increases to a level governed by atmospheric demands unless shoots and roots are protected from drying. Increased survival and growth can be expected over a wide range of site conditions by maintaining PMS at 5 atm or lower during nursery processing. Reduced survival and growth of dry treated seedlings are most likely the results of poor root vigor caused by desiccation of tissues after exposure to high levels of PMS. Modification of nursery procedures to reduce the risks of exposure are discussed. The severe effect of grass competition on first year survival and growth of Douglas-fir seedlings is re-emphasized. Survival with competition was 36% compared to 96% without competition. Seedlings which survived the effects of competition were significantly smaller in diameter, weighed less, and produced less height growth and new foliage than seedlings grown free of competition. A model relating site severity to the expression of treatment differences is presented. The implications of measuring treatment effects on surviving seedlings are discussed.
Author: William I. Stein
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 16
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Author: Daniel L. Noble
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 8
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 756
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Author: W. Lopushinsky
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 8
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Author: R. O. Strothmann
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 6
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Author:
Publisher:
ISBN:
Category : Container gardening
Languages : en
Pages : 212
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 836
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