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Articles 181 - 197 of 197
Full-Text Articles in Life Sciences
Care Of Newly Planted Trees, David P. Mooter, Mark O. Harrell, Laurie J. Stepanek
Care Of Newly Planted Trees, David P. Mooter, Mark O. Harrell, Laurie J. Stepanek
Nebraska Forest Service: Publications
Landscape trees provide beauty and utility. The care they receive during the first few years after planting is critical. This NebGuide discusses recommended cultural practices for young trees. Many recommendations have changed drastically in recent years in light of new and more thorough research.
Inclusion Of Polyamines In The Medium Improves Shoot Elongation In Hazelnut (Corylus Avellana L.) Micropropagation, Mehmet Nuri̇ Nas
Inclusion Of Polyamines In The Medium Improves Shoot Elongation In Hazelnut (Corylus Avellana L.) Micropropagation, Mehmet Nuri̇ Nas
Turkish Journal of Agriculture and Forestry
Buds from newly developed shoots obtained from forced outgrowth of mature field-grown hybrid hazelnut trees (Corylus avellana L.) were cultured in vitro on Murashige and Skoog [MS (1962)] medium and a modified Driver and Kuniyuki [DKW (1984)] medium containing 6.7 µM, 11.1 µM or 15.5 µM of N-6 benzyladenine (BA) supplemented with or without a combination of polyamines (0.2 mM of putrescine + 0.2 mM of spermidine + 0.05 mM of spermine). The effects of culture medium and BA were found to be insignificant on explant response. Polyamines were found to have a strong effect on both shoot elongation and …
Effect Of Hypocotyl Morphology On Survival Rate And Growth Of Watermelon Seedlings Grafted On Rootstocks With Different Emergence Performance At Various Temperatures, Hali̇t Yeti̇şi̇r, Nebahat Sari
Effect Of Hypocotyl Morphology On Survival Rate And Growth Of Watermelon Seedlings Grafted On Rootstocks With Different Emergence Performance At Various Temperatures, Hali̇t Yeti̇şi̇r, Nebahat Sari
Turkish Journal of Agriculture and Forestry
The emergence performance of different rootstocks and watermelon cultivars at different temperatures, and the effect of hypocotyl structure on grafting success and survival rate were investigated. Evaluated rootstocks were Cucurbita moschata (landrace), C. maxima (Arıcan local cultivar), Strong Tosa (C. maxima x C. moschata), P360 (C. maxima x C. moschata), Luffa cylindrica, Benincasa hispida, Lagenaria siceraria (landrace), Skopje (Landrace), and 2 Lagenaria hybrids, 216 and FR Gold. The Crimson Tide watermelon cultivar was used as scion. Emergence tests at 14 ºC, 18 ºC and 25 ºC were carried out for all rootstocks and scion seeds in a growth chamber. Cucurbita …
The Competitive Ability Of Avena Spp. And Alopecurus Myosuroides Huds. Influenced By Different Wheat (Triticum Aestivum) Cultivars, Hüsrev Mennan, Doğan Işik
The Competitive Ability Of Avena Spp. And Alopecurus Myosuroides Huds. Influenced By Different Wheat (Triticum Aestivum) Cultivars, Hüsrev Mennan, Doğan Işik
Turkish Journal of Agriculture and Forestry
Field experiments were conducted at Havza and Gelemen to evaluate the effect of different densities of Avena spp. and Alopecurus myosuroides Huds. on wheat cultivars Bezostaja and Kate-A-I. As expected the semi-dwarf cultivar Bezostaja was shorter than Kate-A-I in all weed densities, indicating that plant height was not correlated with competitiveness under the experimental conditions. The mean yields of Bezostaja and Kate-A-I in the weed-free plots in 2000-2001were 3420 kg ha^{-1} and 3360 kg ha^{-1}, respectively. Both species caused decreases in wheat yield with increasing density. While 20 Avena spp. per square reduced the yield by 13.3% in Bezostaja, yield …
Effect Of Some Factors On The Strength Of Furniture Corner Joints Constructed With Wood Biscuits*, Ali̇ Naci̇ Tankut, Nurgül Tankut
Effect Of Some Factors On The Strength Of Furniture Corner Joints Constructed With Wood Biscuits*, Ali̇ Naci̇ Tankut, Nurgül Tankut
Turkish Journal of Agriculture and Forestry
This study was carried out to evaluate the bending moment resistance and stiffness of case-type furniture corner joints constructed with wood biscuits, and to determine the effects on these joints of some factors including the spacing between wood biscuit hole centers, the distance from the center of the biscuit hole to the corresponding outside edge of the board material, the method of loading, the type of composite board, and the gluing technique. The results indicated that corner joint strength comes mainly from the edge gluing of the face and butt member and not from the glued biscuits. Particleboard (PB) glued …
Insect Growth Regulators For Insect Pest Control*, Hasan Tunaz, Nedi̇m Uygun
Insect Growth Regulators For Insect Pest Control*, Hasan Tunaz, Nedi̇m Uygun
Turkish Journal of Agriculture and Forestry
Insecticides with growth regulating properties (IGR) may adversely affect insects by regulating or inhibiting specific biochemical pathways or processes essential for insect growth and development. Some insects exposed to such compounds may die due to abnormal regulation of hormone-mediated cell or organ development. Other insects may die either from a prolonged exposure at the developmental stage to other mortality factors (susceptibility to natural enemies, environmental conditions etc) or from an abnormal termination of a developmental stage itself. Insect growth regulators may come from a blend of synthetic chemicals or from other natural sources, such as plants. The chemical composition of …
Measuring The Marketing Performances Of State Nurseries In Turkey: Examples Of Eastern Anatolia And Black Sea Region Nurseries, Devlet Toksoy, Hasan Ayyildiz
Measuring The Marketing Performances Of State Nurseries In Turkey: Examples Of Eastern Anatolia And Black Sea Region Nurseries, Devlet Toksoy, Hasan Ayyildiz
Turkish Journal of Agriculture and Forestry
Today, any enterprise has to consider marketing as important as production. Production and marketing are 2 complementary activities in enterprises. An increase in marketing effectiveness is achieved through measuring the activity outcomes that can be described as marketing performance. Because marketing is a social science and, therefore, determining the marketing performance system concretely, examining it and determining its principles may not be possible, a need for a new model was felt to represent the real system, and, consequently, a Multi-Dimensional Purpose-System Model was developed. The above-mentioned model was applied in the 12 Nursery Directorates in the Eastern Anatolia and Black …
Aesthetic Values Of Five Primary Wood Transporting Methods Common To Northern New England, Michael C. Eckley
Aesthetic Values Of Five Primary Wood Transporting Methods Common To Northern New England, Michael C. Eckley
Electronic Theses and Dissertations
Throughout northern New England and across the country, increasing populations and the exurbanization of rural forested landscapes have had a tremendous impact on forest management. As forested areas become more populated, society has become more exposed to the sights and sounds associated with different forest operations. As a result, aesthetics are increasingly driving public reaction to and concern about forestry practices, especially timber harvesting. How people perceive forestry harvesting can be significant in defining the future of forest management, particularly in more populated woodlands. The objective of this study was to better understanding public values as they relate to timber …
Leaf Area Index - Relative Density Relationships In Even-Aged Abies Balsamea - Picea Rubens Stands In Maine, Robert Justin Derose
Leaf Area Index - Relative Density Relationships In Even-Aged Abies Balsamea - Picea Rubens Stands In Maine, Robert Justin Derose
Electronic Theses and Dissertations
Relationships between leaf area index (LAI) and relative density (RD) were examined in even-aged stands of Abies balsunzen (L.) Mill. and Piceu rubens Sarg. Twelve sites distributed across the Acadian forest in Maine were used to test conformance to three hypothesized models of LA1 over RD: A) constantly increasing LA1 over increasing RD, B) constant LA1 with increasing RD, or C) decreasing LA1 with increasing RD. Multivariate ordination suggested young, precommercially thinned (PCT), high-siteindex (SI) A. balsamea stands should be analyzed separate from older, unspaced (NOPCT), lower-site P. rubens stands. All-sided A. balsamea LAIs ranged from 6.2 - 14.8 over …
Historical Reflections On The Arkansas Cross Timbers, Don C. Bragg
Historical Reflections On The Arkansas Cross Timbers, Don C. Bragg
Journal of the Arkansas Academy of Science
Kiichler's original map of potential natural vegetation suggested that the eastern-most extension of the "Cross Timbers" oak-dominated woodland reached into extreme western Arkansas. Recent investigations have found possible old-growth Cross Timber communities in narrow strips along steep, rocky sandstone and shale ridges near Fort Chaffee and Hackett. However, many decades of Euroamerican intervention have altered vegetation composition and structure in west-central Arkansas, making field evaluation difficult. Fortunately, historical accounts of the area provide considerable supporting documentation. General Land Office surveyors, for instance, traversed this portion of western Arkansas before 1850. They reported many ridges and slopes dominated by grassy, stunted …
Stand-Level Green Biomass Equations For Sawtimber-Sized Loblolly Pine In Arkansas, Paul F. Doruska, David W. Patterson, Travis E. Posey
Stand-Level Green Biomass Equations For Sawtimber-Sized Loblolly Pine In Arkansas, Paul F. Doruska, David W. Patterson, Travis E. Posey
Journal of the Arkansas Academy of Science
Loblolly pine (Pinus taeda L.) is commercially the most important timber species in southern Arkansas and the southern United States. Results of stand-level timber inventories have traditionally been reported in terms of volume, yet loblolly pine sawtimber is bought and sold based on biomass. A straight forward stand-level conversion from volume per hectare to biomass per hectare does not exist for Arkansas, thus complicating the valuation of standing loblolly pine sawtimber. Two equations were developed to predict stand-level, outside-bark, green biomass per unit area for loblolly pine stands in southern Arkansas. The merchantable sawlog equation presented herein explained approximately 95% …
Executive Summary The Role Of Ungulate Herbivory And Management On Ecosystem Patterns And Processes: A Problem Analysis, John G. Kie, Martin Vavra
Executive Summary The Role Of Ungulate Herbivory And Management On Ecosystem Patterns And Processes: A Problem Analysis, John G. Kie, Martin Vavra
Aspen Bibliography
No abstract provided.
Growth Trends And Water Use Efficiency Of Pinus Pinaster Ait. In Response To Historical Climate And Groundwater Trends On The Gnangara Mound, Western Australia, Lindsay Bourke
Theses : Honours
In Western Australia, groundwater accounts for about 57% of Perth's water supply. The majority of this is from the Gnangara Mound, the largest superficial aquifer on the Swan Coastal Plain. Prior to the mid 1970's groundwater of the superficial aquifer reached a semi-steady state, however since this period levels have been steadily falling. This decline coincides with a dramatic change in Perth's climate, groundwater abstraction and maturation of pine plantations. The influence of pine plantations upon groundwater recharge is well understood, however there is paucity of information about groundwater use, in particular whether pines directly access shallow groundwater resources. This …
Long-Term Environmental Effects Of Conifer Removal To Achieve Aspen Release In Near-Stream Areas Within The Northern Sierras, Kenneth W. Tate, Bobette Jones, Melanie Mcfarland, Tom Rickman, Al Vasquez
Long-Term Environmental Effects Of Conifer Removal To Achieve Aspen Release In Near-Stream Areas Within The Northern Sierras, Kenneth W. Tate, Bobette Jones, Melanie Mcfarland, Tom Rickman, Al Vasquez
Aspen Bibliography
The advanced state of conifer encroachment in aspen stands in the Sierra Nevada and southern Cascades is retarding aspen regeneration, putting an estimated 70 plus percent of stands at immediate risk of extinction with a significant percentage of stands already lost.
Openness In The Face Of Systemic Constraints On Science, Public Participation, And The Western Australian Regional Forest Agreement, Martin Brueckner
Openness In The Face Of Systemic Constraints On Science, Public Participation, And The Western Australian Regional Forest Agreement, Martin Brueckner
Theses: Doctorates and Masters
The aim of this thesis is to explore the role of science and public participation in environmental policy-making processes in Australia. To this end, I analyse the Western Australian Regional Forest Agreement (RFA) process, a recent Australian Federal Government initiative designed to resolve a longstanding dispute over native forest use and management. Theoretically underpinned by an open systems approach, the thesis employs a case study method for the analysis of the RFA process, using data from three distinct sources; interviews, RFA-related literature, and media content. The analysis of the RFA occurs against the historical background to this policy process and …
Environmental Correlates And Associations Of Tuart (Eucalyptus Gomphocephala) Decline, Todd A. Edwards
Environmental Correlates And Associations Of Tuart (Eucalyptus Gomphocephala) Decline, Todd A. Edwards
Theses: Doctorates and Masters
Tuart (Eucalyptus gomphocephala DC.) is an ecologically and culturally important tree species that grows across a narrow 400 km long coastal belt, from the Sabrina River south of Perth, to Jurien Bay in the north. Unfortunately, Tuart is also a species under considerable threat due to clearing, lack of recruitment and canopy decline. Canopy decline is of particular concern, being increasingly reported throughout the Tuart distribution. Despite this, previous studies of Tuart have generally been limited to localised canopy decline events. This two-phased study firstly involved an assessment of Tuart canopy condition at 46 sites across the species distribution. At …
Agroforestry, Elephants, And Tigers: Balancing Conservation Theory And Practice In Human-Dominated Landscapes Of Southeast Asia, Philip J. Nyhus, R L. Tilson
Agroforestry, Elephants, And Tigers: Balancing Conservation Theory And Practice In Human-Dominated Landscapes Of Southeast Asia, Philip J. Nyhus, R L. Tilson
Philip J. Nyhus
Large mammal populations theoretically are best conserved in landscapes where large protected areas are surrounded by buffer zones, connected by corridors, and integrated into a greater ecosystem. Multi-use buffer zones, including those containing complex agroforestry systems, are promoted as one strategy to provide both economic benefits to people and conservation benefits to wildlife. We use the island of Sumatra, Indonesia to explore the benefits and limitations of this strategy. We conclude that conservation benefits are accrued by expanding the habitat available for large mammals but more attention needs to be focused on how to reduce and respond to human–wildlife conflict …