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2003

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Articles 121 - 143 of 143

Full-Text Articles in Forest Sciences

Biology And Biological Control Of Yellow Starthistle, Linda M. Wilson, Cynthia Jette, John Connett, Joseph Mcaffrey Jan 2003

Biology And Biological Control Of Yellow Starthistle, Linda M. Wilson, Cynthia Jette, John Connett, Joseph Mcaffrey

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

Yellow starthistle (Centaurea solstitialis L.) is an invasive weed introduced from the Mediterranean region. It predominantly infests rangelands in the western United States. This second edition manual on the biological control of yellow starthistle is intended to give weed and land managers guidelines to develop and successfully establish a starthistle biocontrol program.

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Effects Of Water Stress On Germination In Six Provenances Of Pinus Brutia Seeds From Different Bioclimatic Zones In Turkey, Meli̇h Boydak, Hüseyi̇n Di̇ri̇k, Fahretti̇n Ti̇lki̇, Mehmet Çalikoğlu Jan 2003

Effects Of Water Stress On Germination In Six Provenances Of Pinus Brutia Seeds From Different Bioclimatic Zones In Turkey, Meli̇h Boydak, Hüseyi̇n Di̇ri̇k, Fahretti̇n Ti̇lki̇, Mehmet Çalikoğlu

Turkish Journal of Agriculture and Forestry

The effects of water potential on germination were studied in six provenances of Pinus brutia from different bioclimatic zones in Turkey. Water potentials between 0 and -8 bars were obtained using polyethylene glycol 6000 (PEG-6000) solutions. Seeds were kept for 28 d in light (12 h photoperiod at 1000 lux) and at 20 ± 0.5 ^oC. A decrease in water potential produced a marked reduction in germination percentage, germination speed and germination value. Significant variations between the provenances were found. The provenances of humid regions were the most susceptible to high moisture stress, and their germination value and germination percentage …

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A Remote Sensing Approach For Detecting Agricultural Encroachment On The Eastern Mediterranean Coastal Dunes Of Turkey, Süha Berberoğlu, Hakan Alphan, Kemal Tuluhan Yilmaz Jan 2003

A Remote Sensing Approach For Detecting Agricultural Encroachment On The Eastern Mediterranean Coastal Dunes Of Turkey, Süha Berberoğlu, Hakan Alphan, Kemal Tuluhan Yilmaz

Turkish Journal of Agriculture and Forestry

The aim of this study was to develop an effective procedure for detecting land use/land cover (LU/LC) changes resulting from agricultural encroachment on eastern Mediterranean coastal dunes by using remote-sensing techniques. Historic LU/LC information was extracted from aerial photos taken in 1976 and IKONOS imagery was acquired in 2002 to determine the current LU/LC pattern. The remotely sensed aerial and satellite data were classified by integrating spectral information with measures of texture, in the form of statistics derived from the variance, co-occurrence matrix and variogram. The performance of these classification approaches was evaluated in terms of error matrices. The accuracy …

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Improving The Mass Rearing Possibilities Of Serangium Montazerii Fürsch (Coleoptera: Coccinellidae) On Different Host Plants Of Bemisia Tabaci (Genn.) (Homoptera: Aleyrodidae), Gonca Vatansever, M. Rifat Ulusoy, Lerzan Bakircioğlu Erkiliç Jan 2003

Improving The Mass Rearing Possibilities Of Serangium Montazerii Fürsch (Coleoptera: Coccinellidae) On Different Host Plants Of Bemisia Tabaci (Genn.) (Homoptera: Aleyrodidae), Gonca Vatansever, M. Rifat Ulusoy, Lerzan Bakircioğlu Erkiliç

Turkish Journal of Agriculture and Forestry

The objectives of this study were to identify suitable plant species for mass rearing and to determine some biological characteristics of the predator Serangium montazerii Fürsch (Coleoptera: Coccinellidae) used in the biological control of Dialeurodes citri (Ashmead) (Homoptera: Aleyrodidae). The development time, mortality rate, preoviposition, oviposition and postoviposition periods and fecundity of S. montazerii were studied on various host plants using Bemisia tabaci (Genn.) (Homoptera: Aleyrodidae). Two cotton (Çukurova-1518 and Deltapine) and two eggplant (Pala and Çukurova topağı) cultivars were used at 25 ºC and 65 ± 5% RH in growth chambers. Additionally, life tables were constructed from the data …

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Forest Certification As Environmental Law Making By Global Civil Society, Errol E. Meidinger Jan 2003

Forest Certification As Environmental Law Making By Global Civil Society, Errol E. Meidinger

Contributions to Books

Published in Social and Political Dimensions of Forest Certification, Errol Meidinger, Christopher Elliott & Gerhard Oesten, eds.

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The Fundamentals Of Forest Certification, Errol E. Meidinger, Christopher Elliott, Gerhard Oesten Jan 2003

The Fundamentals Of Forest Certification, Errol E. Meidinger, Christopher Elliott, Gerhard Oesten

Contributions to Books

Published in Social and Political Dimensions of Forest Certification, Errol Meidinger, Christopher Elliott & Gerhard Oesten, eds.

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Quantifying Forest Ground Flora Biomass Using Proximal Sensing, Paul F. Doruska, Robert C. Weih Jr., Matthew D. Lane, Don C. Bragg Jan 2003

Quantifying Forest Ground Flora Biomass Using Proximal Sensing, Paul F. Doruska, Robert C. Weih Jr., Matthew D. Lane, Don C. Bragg

Journal of the Arkansas Academy of Science

Current focus on forest conservation and forest sustainability has increased the level of attention given to measures of ground flora in forest ecosystems. Traditionally, such data are collected via time- and resource-intensive methods of field identification, clipping, and weighing. With increased focus on community composition and structure measures of forest ground flora, the manner in which these data are collected must change. This project uses color and color infrared digital cameras to proximally sense forest ground flora and to develop regression models to predict green and dry biomass (g/m^) from the proximally sensed data. Traditional vegetative indices such as the …

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Selection Of Chickpea (Cicer Arietinum L.) Genotypes For Resistance To Ascochyta Blight [Ascochyta Rabiei (Pass.) Labr.], Yield And Yield Criteria, Cengi̇z Toker, Hüseyi̇n Çanci Jan 2003

Selection Of Chickpea (Cicer Arietinum L.) Genotypes For Resistance To Ascochyta Blight [Ascochyta Rabiei (Pass.) Labr.], Yield And Yield Criteria, Cengi̇z Toker, Hüseyi̇n Çanci

Turkish Journal of Agriculture and Forestry

Ascochyta blight, caused by Ascochyta rabiei (Pass.) Lab., is the most important disease in the chickpea (Cicer arietinum L.) in many countries, including Turkey. Efforts to control the disease were made using host-plant resistance as the most efficient and economical way. A total of 41 exotic genotypes were evaluated for resistance to A. rabiei and also yield and yield criteria near Antalya in the west Mediterranean region of Turkey in the 2000-2001 and 2001-2002 seasons. After every 2 test lines, the susceptible check ILC 263 was sown. When the susceptible check was completely killed by ascochyta blight, blight severity was …

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Comparative Genetics Of Crop Plant Domestication And Evolution, Anne Frary, Sami̇ Doğanlar Jan 2003

Comparative Genetics Of Crop Plant Domestication And Evolution, Anne Frary, Sami̇ Doğanlar

Turkish Journal of Agriculture and Forestry

Domesticated species differ from their wild ancestors and relatives for a set of traits that is known as the domestication syndrome. The most important syndrome traits include growth habit, flowering time, seed dispersal, gigantism and morphological diversity. This paper reviews what is known about the genetic control of domestication traits with an emphasis on comparative analyses that examine this control in two or more crop species. Such analyses indicate that although most domestication traits are quantitatively controlled, the dramatic morphological changes that accompanied domestication may be due to relatively few genes. These studies also show that domestication genes have been …

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Analysis Of The Marketing Structure Of The Dairy Industry In The Trakya Region And The Determination Of Emerging Issues With Multidimensional Scaling, M. Ömer Azabağaoğlu, Okan Gaytanci̇oğlu, Ahmet Kubaş, Recep Erbay Jan 2003

Analysis Of The Marketing Structure Of The Dairy Industry In The Trakya Region And The Determination Of Emerging Issues With Multidimensional Scaling, M. Ömer Azabağaoğlu, Okan Gaytanci̇oğlu, Ahmet Kubaş, Recep Erbay

Turkish Journal of Agriculture and Forestry

The purpose of this paper is to examine the marketing structure of milk processors, factors influencing production and problems faced by firms following recent economic conditions in the Trakya region. Dairy cattle production is more developed in the research area than in other regions. In addition, the region has played an important role with its high milk processing capacity. The research results indicate that the dairy industry has important problems, such as an insufficient and low quality milk supply, and poor hygiene and marketing. In particular, a large number of small-and medium-sized milk processors face extensive hygiene and marketing problems. …

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Effect Of Thermal Screens On The Microclimate And Overall Heat Loss Coefficient In Plastic Tunnel Greenhouses, H. Hüseyi̇n Öztürk, Ali̇ Başçeti̇nçeli̇k Jan 2003

Effect Of Thermal Screens On The Microclimate And Overall Heat Loss Coefficient In Plastic Tunnel Greenhouses, H. Hüseyi̇n Öztürk, Ali̇ Başçeti̇nçeli̇k

Turkish Journal of Agriculture and Forestry

The objective of the present study was to evaluate the effects of thermal screens made of clear polyethylene (PE) and polyester material on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses. The dimensions of the plastic tunnels were: width 6 m, length 20 m and height 3 m. Three different installations were used: (1) a single cover without a screen (as a control); (2) a single cover with a PE screen; and (3) a single cover with a polyester screen. The thermal screens made of PE with UV+IR additives and polyester materials were placed at a height …

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Effects Of Seed Rates On Forage Production, Seed Yield And Hay Quality Of Annual Legume-Barley Mixtures, Yaşar Karadağ, Uğur Büyükburç Jan 2003

Effects Of Seed Rates On Forage Production, Seed Yield And Hay Quality Of Annual Legume-Barley Mixtures, Yaşar Karadağ, Uğur Büyükburç

Turkish Journal of Agriculture and Forestry

The forage yield and quality of common vetch, grasspea and barley grown alone and as mixtures were investigated in field experiments conducted at the Faculty of Agriculture, Gaziosmanpaşa University, in 2001 and 2002. The highest green forage (39.65 t ha^{-1}) and dry matter yields (10.71 t ha^{-1}) were obtained from the mixture including 25% common vetch and 75% barley, while the highest total seed yield (2.95 t ha^{-1}) was obtained from the mixture including 25% grasspea and 75% barley. In addition, the highest crude protein yield (1.53 t ha^{-1}) was achieved with the 50% grasspea and 50% barley mixture. The …

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Effects Of Seedling And Gf-31 Rootstocks On Yield And Fruit Quality Of Some Table Apricot Cultivars Grown In Mersin, Levent Son, Ali̇ Küden Jan 2003

Effects Of Seedling And Gf-31 Rootstocks On Yield And Fruit Quality Of Some Table Apricot Cultivars Grown In Mersin, Levent Son, Ali̇ Küden

Turkish Journal of Agriculture and Forestry

This experiment was conducted in Mut-Mersin between 1997 and 2001 to determine the effects of seedling and GF-31 rootstocks on the yield and quality of fruits of Tokaloğlu, Precoce De Tyrinthe, Joubert Foulon, Canino, Sakıt 6, Beliana, Priana and Early Kishnevski table apricot cultivars. Fruit yields were highest on apricot seedling rootstocks for all cultivars. Yields (kg tree^{-1}) ranged between 14.66 kg (Tokaloğlu) and 63.06 kg (Priana) on apricot seedling rootstocks and between 13.6 kg (Sakıt 6) and 41.13 kg (Priana) on Myrobalan GF-31 rootstock in 2001. Of the cultivars tested, Priana gave the highest yield (kg tree^{-1}), except in …

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Assessment Of Irrigation Schemes With Comparative Indicators In The Southeastern Anatolia Project, Hasan Deği̇rmenci̇, Hakan Büyükcangaz, Hayretti̇n Kuşcu Jan 2003

Assessment Of Irrigation Schemes With Comparative Indicators In The Southeastern Anatolia Project, Hasan Deği̇rmenci̇, Hakan Büyükcangaz, Hayretti̇n Kuşcu

Turkish Journal of Agriculture and Forestry

In this study, 6 comparative indicators for the assessment of irrigation system performance were applied to 12 irrigation schemes, which were components of the Southeastern Anatolian Project, for the period 1997-2001. The output per unit cropped area, output per unit command, output per unit irrigation supply, output per unit water consumed, relative water supply and irrigation ratio were calculated as 1223-9436 $ ha^{-1}, 308-5771 $ ha^{-1}, 0.12-2.16 $ m^{-3}, 0.45-2.92 $ m^{-3}, 1.00-5.90, and 7-100%, respectively. ANOVA test results indicated that among the schemes the differences in the output per unit cropped area, output per unit irrigation supply, output per …

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An Econometric Analysis Of Apricot Supply And Export Demand In Turkey, İlkay Dellal, A. Ali̇ Koç Jan 2003

An Econometric Analysis Of Apricot Supply And Export Demand In Turkey, İlkay Dellal, A. Ali̇ Koç

Turkish Journal of Agriculture and Forestry

This study estimates a supply model for apricots and an export demand model for dried apricots for Turkey to provide unit-free measure coefficients for better supply and marketing management. Using parameter estimates from the models and sample average data, elasticities of long-run supply, price-yield and export of dried apricots were computed as 0.72, 0.54 and -0.87 respectively. From the price dependent export demand model, the price flexibility of dried apricots was calculated as -0.71. In this study, the import demand elasticities of dried apricots for major destination countries were estimated and found to be inelastic. An evaluation of aggregated household …

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Nitrogen Fertiliser Recovery And Yield Response Of Greenhouse Grown And Fertigated Tomato To Root - Zone Soil Water Tension, Cevat Kirda, Nafi̇ Baytorun, M. Rifat Deri̇ci̇, H. Yildiz Daşgan, Çağatay Tanriverdi̇, Zekai̇ Gümüş Jan 2003

Nitrogen Fertiliser Recovery And Yield Response Of Greenhouse Grown And Fertigated Tomato To Root - Zone Soil Water Tension, Cevat Kirda, Nafi̇ Baytorun, M. Rifat Deri̇ci̇, H. Yildiz Daşgan, Çağatay Tanriverdi̇, Zekai̇ Gümüş

Turkish Journal of Agriculture and Forestry

Tomatoes were grown in a plastic greenhouse under 2 irrigation programmes and four N-fertiliser concentrations (0, 100, 150 and 200 mg N l^{-1}) of irrigation water. P and K concentrations were kept constant at 30 and 200 mg l^{-1}, respectively, for all N treatments. A drip irrigation system with single laterals centred between the plant rows, spaced 50 cm apart was used for irrigation as well as for feeding fertiliser solution (i.e. fertigation) during the experiment. Tensiometers, installed in 3 replicates at 45 cm soil depth and centred mid-way between 2 plants in rows, were used for irrigation scheduling. Two …

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Effects Of Boron Fertilization On The Yield And Some Yield Components Of Bread And Durum Wheat, Aydin Güneş, Mehmet Alpaslan, Ali̇ İnal, M. Sai̇t Adak, Fi̇gen Eraslan, Nuray Çi̇çek Jan 2003

Effects Of Boron Fertilization On The Yield And Some Yield Components Of Bread And Durum Wheat, Aydin Güneş, Mehmet Alpaslan, Ali̇ İnal, M. Sai̇t Adak, Fi̇gen Eraslan, Nuray Çi̇çek

Turkish Journal of Agriculture and Forestry

A greenhouse and a 1-year field study were conducted during the cropping season on the effects of B on yield and some yield components of bread (Triticum aestivum L, cv. Bezostaja) and durum (Triticum durum L. cv. Kiziltan) wheat cultivars in a B-deficient soil (0.68 mg kg^{-1}, NH4OAc extractable). Boron was applied as H_3BO_3 at 0, 0.5, 1.0, 1.5, 2.0 and 2.5 mg B kg^{-1} in the greenhouse study and 0, 1.0, 2.0, 3.0, 4.0 and 5.0 kg B ha^{-1} in the field study. Shoot dry weights of Bezostaja and Kiziltan significantly increased regardless of the applied B levels in …

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2nd Lone Star Native Regional Plant Conference, David Creech, Greg Grant, Mark Norman, Dawn Parish, Matt Welch Jan 2003

2nd Lone Star Native Regional Plant Conference, David Creech, Greg Grant, Mark Norman, Dawn Parish, Matt Welch

Lone Star Regional Native Plant Conference

No abstract provided.

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Photodegradation And Photostabilization Of Weathered Wood Flour Filled Polyethylene Composites, Nicole M. Stark Jan 2003

Photodegradation And Photostabilization Of Weathered Wood Flour Filled Polyethylene Composites, Nicole M. Stark

Dissertations, Master's Theses and Master's Reports - Open

Wood plastic composites (WPCs) have gained popularity as building materials because of their usefulness in replacing solid wood in a variety of applications. These composites are promoted as being low-maintenance, high-durability products. However, it has been shown that WPCs exposed to weathering may experience a color change and/or loss in mechanical properties. An important requirement for building materials used in outdoor applications is the retention of their aesthetic qualities and mechanical properties during service life. Therefore, it is critical to understand the photodegradation mechanisms of WPCs exposed to UV radiation and to develop approaches to stabilize these composites (both unstabilized …

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The Composition Of Cryptophytes (Geophytes) And Other Plants In The Northern Jarrah Forest Of Western Australia: An Analysis Of Logged And Old Growth Forest, Conrad C. Slee Jan 2003

The Composition Of Cryptophytes (Geophytes) And Other Plants In The Northern Jarrah Forest Of Western Australia: An Analysis Of Logged And Old Growth Forest, Conrad C. Slee

Theses : Honours

Forests are decreasing globally and there are pressing requirements for ecologically sustainable forest management to be implemented at all scales. There has been some criticism of the public managers for forests and the processes used to select reserve systems and silvicultural methods used. Limited research has been conducted on the effects of logging on the plants of the northern Jarrah forest of south western Australia, While fire is a major disturbance event, disturbance during logging operations may remove non-commercial trees, understorey shrubs and change soil conditions. Some plants that regenerate from below ground storage organs such as Cryptophytes (Geophytes) may …

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Quantifying Ecosystem Geomorphology Of The Southern Appalachian Mountains, Scott R. Abella Jan 2003

Quantifying Ecosystem Geomorphology Of The Southern Appalachian Mountains, Scott R. Abella

Public Policy and Leadership Faculty Research

Geomorphology is a dominant factor influencing vegetation distribution in the southern Appalachians, and quantifying landform characteristics is increasingly important for forest ecosystem classification. This study used slope gradient and two previously published geomorphic indices, terrain shape index and landform index that quantify landform shape and protection, to develop a field-based landform quantification system at four study areas in the southern Appalachians. Six major landform types (ridgetops, nose slopes, linear hillslopes, coves, stream ravines, and stream bottoms) exhibited quantitatively different characteristics, and these differences among landforms were not evident when using only categorical landform descriptions (e.g., convex, concave) that have been …

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Dark Wilderness A Phenomenological Exploration Of The Idea Of Cave Wilderness, Patricia E. Seiser Jan 2003

Dark Wilderness A Phenomenological Exploration Of The Idea Of Cave Wilderness, Patricia E. Seiser

Graduate Theses, Dissertations, and Problem Reports (ETD)

It has been almost forty years since the passage of the 1964 Wilderness Act and the establishment of the National Wilderness Preservation System. Forty years later, we still have not seen a wilderness that is not a surface environment. There exist neither subterranean nor marine wilderness areas. Efforts on behalf of cave wilderness have focused on the 1964 Wilderness Act legal definition of wilderness. Perhaps what is required is a different concept for the establishment of cave wilderness. This study explored the idea of cave wilderness from a human dimension perspective, via focus groups, using stakeholders from two cave regions …

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The Economic Value Of Tourism And Recreation In Forested Areas Of Western Australia, Rachel Goff Jan 2003

The Economic Value Of Tourism And Recreation In Forested Areas Of Western Australia, Rachel Goff

Theses: Doctorates and Masters

In recent years, natural area tourism has been presented as a more profitable, labour intensive and environmentally sound industry than the traditional extractive industries which have resulted in the depletion of primary resources in many countries (Burr, 1995). However, in order for economic returns from tourism to be maintained over a long period of time, investment in resources and infrastructure that support and encourage sustainable tourism and recreation activity in natural areas is required. The key to sustainability is maintaining the capital stock of resources (Garrod & Fyall, 1998; Russell, 2001). In a society driven by economics, resources are allocated …

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