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Articles 1501 - 1530 of 2171
Full-Text Articles in Life Sciences
Palynological Study On The Pollen Grains Of Selected Turkish Grape (Vitis Vinifera L.) Cultivars, Bi̇rhan Marasali, Münevver Pinar, H. Nurhan Büyükkartal
Palynological Study On The Pollen Grains Of Selected Turkish Grape (Vitis Vinifera L.) Cultivars, Bi̇rhan Marasali, Münevver Pinar, H. Nurhan Büyükkartal
Turkish Journal of Agriculture and Forestry
The pollen morphology and ultrastructure of selected Turkish indigenous grape cultivars and newly released hybrid varieties were examined by light microscopy and scanning electron microscopy. The pollen differed in some microstructural parameters. The size of the pollen grains ranged from 19.0 x 22.4 µm in Beyaz Çavuş to 24.3 x 21.0 µm in Siyah Gemre. Hönüsü cultivar showed significant variations in the sizes of the polar and equatorial axes. The greatest colpus size was measured in Siyah Gemre (18.4 µm) and the longest pore size was observed in Ata sarısı (28 µm). The exine thickness of the pollen grains ranged …
Cambial Isoperoxidases Related To Graft Compatibility In Pear-Quince Graft Combinations, Hati̇ce Gülen, Menşure Çeli̇k, Mehmet Polat, Ati̇lla Eri̇ş
Cambial Isoperoxidases Related To Graft Compatibility In Pear-Quince Graft Combinations, Hati̇ce Gülen, Menşure Çeli̇k, Mehmet Polat, Ati̇lla Eri̇ş
Turkish Journal of Agriculture and Forestry
This study was initiated to survey the graft compatibility characteristics of some selected quince clones known as "S.Ö." with regard to isoperoxidase markers. Compatible (Beurre Hardy = BH) and incompatible (Bartlett = BT) pear cultivars were grafted on quince A (QA) and 13 S.Ö. quince clones by T budding. Bark tissues were collected from the union (4, 8 and 12 weeks after grafting) and from unbudded rootstocks in addition to current-year shoots of 2 pear scions to investigate 2 anodal isoperoxidase bands. Isoperoxidase profiles of the samples were visualized by native polyacrylamide gel electrophoresis and no marked difference was detected …
Controlling Foliar Blight Of Wheat In South Asia: A Holistic Approach, Etienne Duveiller, R. C. Sharma, D. Mercado, H. Maraite, M. R. Bhatta, G. Ortiz-Ferrara, D. Sharma
Controlling Foliar Blight Of Wheat In South Asia: A Holistic Approach, Etienne Duveiller, R. C. Sharma, D. Mercado, H. Maraite, M. R. Bhatta, G. Ortiz-Ferrara, D. Sharma
Turkish Journal of Agriculture and Forestry
Foliar blight is a major biotic constraint to wheat in the Gangetic plains of south Asia, particularly in the rice-wheat system. The disease occurs as a complex of spot blotch and tan spot caused by C. sativus and P. tritici-repentis, respectively. Yield losses reach on average 15% but are variable depending on sowing time, years, locations and stress conditions. Resistance breeding has been the cornerstone of the control strategy. Through international agricultural research efforts in collaboration with National Agricultural Research Systems (NARS), resistance sources from China, Zambia and Brazil were identified and novel germplasm such as synthetic hexaploid wheats derived …
International Cooperation For Winter Wheat Improvement In Central Asia: Results And Perspectives, Alexei I. Morgounov, H.-J. Braun, H. Ketata, R. Paroda
International Cooperation For Winter Wheat Improvement In Central Asia: Results And Perspectives, Alexei I. Morgounov, H.-J. Braun, H. Ketata, R. Paroda
Turkish Journal of Agriculture and Forestry
Crop production in Central Asia has long history going back to 2000-3000 years BC. The farming in the past was mainly concentrated in irrigated areas along the two main river basins: AmuDarya and Syr-Darya. Wheat cultivation in Central Asia in the 20th century concentrated primarily in rainfed area. The breeding work conducted at several stations in the region was initially based on local landraces and resulted in adapted varieties. However, the breeding work was not consistent and interrupted. Since 1991 the wheat became an important crop due to food security concern and replaced cotton in some areas. The modern varieties …
Avenacin A-1 Content Of Some Local Oat Genotypes And The In Vitro Effect Of Avenacins On Several Soil-Borne Fungal Pathogens Of Cereals, Fi̇gen Mert Türk, Cem Ö. Egesel, M. Kemal Gül
Avenacin A-1 Content Of Some Local Oat Genotypes And The In Vitro Effect Of Avenacins On Several Soil-Borne Fungal Pathogens Of Cereals, Fi̇gen Mert Türk, Cem Ö. Egesel, M. Kemal Gül
Turkish Journal of Agriculture and Forestry
Avenacins are a mixture of 4 major (avenacin A-1, B-1, A-2 and B-2) autofluorescent compounds that are accumulated in the roots of oats (Avena spp.), especially root tips, and that have antimicrobial properties. In this research, we screened 189 genotypes of the family Gramineae for autofluorescence and also quantified 35 Avena genotypes for avenacin A-1 content, which is the most abundant and toxic avenacin type. Screening under UV transillumination proved that none of the species, except for Avena spp. accumulated avenacins in their roots. We aimed to find a genotype that lacks avenacin A-1 in order to investigate fungus-oat interaction …
Response To Some Acaricides Of The Two-Spotted Spider Mite (Tetranychus Urticae Koch) From Protected Vegetables In Isparta, Recep Ay, Elvan Sökeli̇, İsmai̇l Karaca, M. Oktay Gürkan
Response To Some Acaricides Of The Two-Spotted Spider Mite (Tetranychus Urticae Koch) From Protected Vegetables In Isparta, Recep Ay, Elvan Sökeli̇, İsmai̇l Karaca, M. Oktay Gürkan
Turkish Journal of Agriculture and Forestry
The two-spotted spider mite, Tetranychus urticae Koch, was tested for susceptibility to various acaricides, propargite (Omite) 570 g l^{-1}, amitraz (Kortraz) 200 g l^{-1} and abamectin (Agrimec) 18 g l^{-1}. Propargite, a selective acaricide, has been used to control T. urticae in many crops in Turkey. Amitraz and abamectin have acaricidal and insecticidal properties, and are thus used to control spider mites and some vegetable pests (e.g., whiteflies and Liriomyza spp.). Five different T. urticae populations collected from vegetable greenhouses in Isparta and their responses to those acaricides were investigated by leaf dip assay and compared with those of a …
Influence Of Seed Development And Seed Position On Oil, Fatty Acids And Total Tocopherol Contents In Sunflower (Helianthus Annuus L.), Hasan Baydar, Sabri̇ Erbaş
Influence Of Seed Development And Seed Position On Oil, Fatty Acids And Total Tocopherol Contents In Sunflower (Helianthus Annuus L.), Hasan Baydar, Sabri̇ Erbaş
Turkish Journal of Agriculture and Forestry
Sunflower (Helianthus annuus L.) is one of the most important oil crops in the world due to its excellent oil quality. This research was conducted to evaluate changes in the contents of oil, fatty acids and total tocopherol of sunflower seeds obtained from different maturity stages and positions on the head. The heads were harvested sequentially 10, 15, 20, 25, 30, 35, 40, and 45 days after flowering (DAF) in 2002 and 2003. The oil content of sunflower seeds increased significantly with seed development, reaching a maximum value of 45.8% at 35 DAF in 2002 and 47.9% at 30 DAF …
Effects Of Explant Types And Different Concentrations Of Sucrose And Phytoharmones On Plant Regeneration And Hypericin Content In Hypericum Perforatum L., Ali̇ Kemal Ayan, Cüneyt Çirak, Kudret Kevseroğlu, Atalay Sökmen
Effects Of Explant Types And Different Concentrations Of Sucrose And Phytoharmones On Plant Regeneration And Hypericin Content In Hypericum Perforatum L., Ali̇ Kemal Ayan, Cüneyt Çirak, Kudret Kevseroğlu, Atalay Sökmen
Turkish Journal of Agriculture and Forestry
Hypericum perforatum L. is a medicinal perennial known as "St. John's wort" in Western Europe and used in the treatment of mild to moderate depression. Hypericin, a dianthrone red pigment, is considered responsible for reversing the depression symptoms. The goal of this study was to produce this pigment via micropropagation and thereby describe a suitable micropropagation method for this plant. To achieve this objective, leaf discs and stem segments were cultured on Murashige and Skoog (MS) medium supplemented with kinetin and 2,4-dichlorophenoxyacetic acid (0.5, 1 and 1.5 mg l^{-1}) and sucrose concentrations (30, 40 and 50 g l^{-1}) in darkness …
Changes In Endogenous Hormone Levels During The Ripening Of Grape Cultivars Having Different Berry Set Mechanisms, Ni̇lgün Göktürk Baydar, Ni̇hat Harmankaya
Changes In Endogenous Hormone Levels During The Ripening Of Grape Cultivars Having Different Berry Set Mechanisms, Ni̇lgün Göktürk Baydar, Ni̇hat Harmankaya
Turkish Journal of Agriculture and Forestry
Concentrations of indole-3-acetic acid (IAA), gibberellic acid (GA_3) and abscisic acid (ABA) were measured by gas chromatography (GC) in the berries of 3 grape cultivars having different berry set mechanisms to elucidate the possible relationship between endogenous hormones and berry set mechanisms. The results obtained showed that the levels of IAA, GA_3 and ABA in seeded Italia, empty seeded Çavuş and stenospermocarpic seedless Perlette changed during ripening. While Italia exhibited a hormonal pattern similar to that of Çavuş, Perlette showed a different IAA and ABA pattern compared to the other cultivars. Generally, IAA and GA_3 were high in the early …
Development Of A Method For Priority Setting In Forestry Research Projects In Turkey, İsmet Daşdemi̇r
Development Of A Method For Priority Setting In Forestry Research Projects In Turkey, İsmet Daşdemi̇r
Turkish Journal of Agriculture and Forestry
This paper deals with the priority-setting problem in public research projects in the Turkish forestry sector. For this aim, a combined method has been developed, that is scientific, objective, dynamic, consistent, multidimensional, easily applicable and understandable. The theoretical framework, peculiarities and criteria of the method and weighting of the criteria are explained. Assuring hierarchical multidimensional consistency between the purposes and priorities in the national and sectoral plans with the priorities of forestry research projects was followed for selecting the criteria and weighting them. This method was suggested to the Ministry of Environment and Forestry and its application was implemented through …
Effects Of Some Soil Properties On The Growth Of Hybrid Poplar In The Terme-Gölardı Region Of Turkey, Aydin Tüfekçi̇oğlu, Lokman Altun, H. Zeki̇ Kalay, Murat Yilmaz
Effects Of Some Soil Properties On The Growth Of Hybrid Poplar In The Terme-Gölardı Region Of Turkey, Aydin Tüfekçi̇oğlu, Lokman Altun, H. Zeki̇ Kalay, Murat Yilmaz
Turkish Journal of Agriculture and Forestry
In this study, the effects of some physical and chemical soil properties on the growth of hybrid poplar were investigated in the Terme-Gölardı region where a poor growth of trees was observed. Soil samples were taken from both poor and good growth areas. Chemical soil properties such as pH, exchangeable Na^+, K^+, Ca^{++} and Mg^{++} content, CEC, phosphorus content and salinity were determined. Physical soil properties such as field capacity, permanent wilting point, water holding capacity and available water were measured. Ground water depth was measured in the field during soil sampling. Clay and Mg++ content and pH of the …
Effects Of Mimosa Bark Usage On Some Properties Of Particleboard, Gökay Nemli̇, Gürsel Çolakoğlu
Effects Of Mimosa Bark Usage On Some Properties Of Particleboard, Gökay Nemli̇, Gürsel Çolakoğlu
Turkish Journal of Agriculture and Forestry
The objective of this study was to determine the effect of mimosa bark usage on the formaldehyde emission, physical and mechanical properties of particleboard. Fifteen panels from black locust (Robinia pseudoacacia L.) wood containing mimosa bark in a core layer at different ratios were manufactured. Three boards without bark addition were produced as control boards. Formaldehyde emission, modulus of rupture, modulus of elasticity, internal bond strength and thickness swelling of the specimens were tested. It was found that panels made from black locust wood had the highest mechanical properties while panels containing mimosa bark had the lowest. Bark usage significantly …
Comparison Of Parameter Estimation Methods For The Three-Parameter Generalized Pareto Distribution, Teki̇n Özteki̇n
Comparison Of Parameter Estimation Methods For The Three-Parameter Generalized Pareto Distribution, Teki̇n Özteki̇n
Turkish Journal of Agriculture and Forestry
The generalized Pareto distribution, which is a special case of both exponential and Wakeby distribution, has good potential for the analysis of flood peaks because of its inherent properties. In this paper, the parameter estimation methods of the moments, probability-weighted moments, maximum likelihood, principle of maximum entropy, and least squares to estimate the parameters in the three-parameter generalized Pareto distribution are compared. The usefulness and applicability of each method is discussed by application to observed annual discharge data for 50 different rivers, most of them in Turkey. The comparisons are based on the ability of each method to predict the …
Comparison Of Decomposition Rates Of Beech (Fagus Orientalis Lipsky) And Spruce (Picea Orientalis (L.) Link) Litter In Pure And Mixed Stands Of Both Species In Artvin, Turkey, Temel Sariyildiz, Aydin Tüfekçi̇oğlu, Mehmet Küçük
Comparison Of Decomposition Rates Of Beech (Fagus Orientalis Lipsky) And Spruce (Picea Orientalis (L.) Link) Litter In Pure And Mixed Stands Of Both Species In Artvin, Turkey, Temel Sariyildiz, Aydin Tüfekçi̇oğlu, Mehmet Küçük
Turkish Journal of Agriculture and Forestry
The decomposition of spruce, beech and mixed litters of spruce and beech was investigated over 3.5 years in beech, spruce and mixed (beech/spruce) stands using less than 1.5 mm mesh litter bags. Initially, carbon, nitrogen, lignin and cellulose concentrations, and C:N and lignin:N ratios were determined in beech and spruce litters. For all sampling intervals, mixed litters showed higher decay rates than individual beech and spruce litters in both pure stands and mixed stands. Spruce decomposed more rapidly than beech, and initial lignin concentration explained most of the variation in decomposition rates between beech and spruce. However, differences in decomposition …
Soil Erosion Risk Assessment Of The Gölbaşı Environmental Protection Area And Its Vicinity Using The Corine Model, Orhan Dengi̇z, Suat Akgül
Soil Erosion Risk Assessment Of The Gölbaşı Environmental Protection Area And Its Vicinity Using The Corine Model, Orhan Dengi̇z, Suat Akgül
Turkish Journal of Agriculture and Forestry
The main objective of this study was to determine the soil erosion risk in Gölbaşı Environmental Protection Area and its vicinity using the CORINE model. The model consists of 6 steps, each of which using different overlaying combinations of soil texture, depth, stoniness, climatic data, land use and land cover information. In the first step, soil texture, depth and stoniness layers were extracted from a 1:25,000 scaled digital soil map and overlaid to form a soil erodibility map. Secondly Fournier and Bagnouls-Gaussen aridity indexes calculated from the climatic data were used to form the erosivity layer of the study area. …
A New Method For The Detection Of Minor Populations Of Citrus Tristeza Virus Strains Infecting Single Citrus Trees, Hani̇fe Genç
A New Method For The Detection Of Minor Populations Of Citrus Tristeza Virus Strains Infecting Single Citrus Trees, Hani̇fe Genç
Turkish Journal of Agriculture and Forestry
Fifteen different biologically important citrus tristeza virus (CTV) isolates (B14, B15, B23, B31, B52, B57, T36, D9, D10, D11, D12, D15, D16, D20 and D32) were tested using strain-specific biotin-labeled oligonucleotide probes. Coat protein genes (CPGs) of the samples were amplified by PCR, and the products were hybridized with probes (direct PCR hybridization (DPH)) and sequenced. In the DPH, all samples having probe 0 reactions were infected with CTV. Some isolates giving more than one specific probe reaction showed that they may be infected by mixtures of different CTV strains. In order to investigate this, CPGs from individual bacterial colonies …
Effects Of Different Tire Configurations On Tractor Performance, Sarp Korkut Sümer, Alaetti̇n Sabanci
Effects Of Different Tire Configurations On Tractor Performance, Sarp Korkut Sümer, Alaetti̇n Sabanci
Turkish Journal of Agriculture and Forestry
The effects of tire ply constructions (radial and bias) and tire arrangements (singles and duals on rear the axle) on tractor performance were evaluated for 2 gear levels on 2 different fields covered with wheat stubble and having different soil types, clay and sandy-loam. For this purpose, the tractor's overall efficiency, specific fuel consumption, and slip values were determined using parameters measured in the study. The results showed that the use of radial tires provided some advantages. For example, overall tractor efficiency with radial tires instead of bias tires increased by 3.44%, while specific fuel consumption decreased by 3.08% on …
Fifth Year Performance Of Morphologically Graded Cedrus Libani Seedlings In The Central Anatolia Region Of Turkey, Akkin Semerci̇
Fifth Year Performance Of Morphologically Graded Cedrus Libani Seedlings In The Central Anatolia Region Of Turkey, Akkin Semerci̇
Turkish Journal of Agriculture and Forestry
The effects of morphological characteristics on seedling performance were studied in Cedrus libani seedlings at 3 locations in the Central Anatolia region of Turkey. Some 2+0 seedlings were morphologically graded according to height and root collar diameter sizes. The seedlings were divided into 5 height categories and each height category was divided into small and large root collar diameter subcategories. The morphologically graded seedlings were planted at 3 locations. After 5 growing seasons, the mean survival of the seedlings planted in Ankara, Eskişehir and Konya locations was 84.4%, 77.9% and 54.7%, respectively. The mean height of seedlings planted in Ankara, …
The Effects Of Joint Forms (Shape) And Dimensions On The Strengths Of Mortise And Tenon Joints, Ali̇ Naci̇ Tankut, Nurgül Tankut
The Effects Of Joint Forms (Shape) And Dimensions On The Strengths Of Mortise And Tenon Joints, Ali̇ Naci̇ Tankut, Nurgül Tankut
Turkish Journal of Agriculture and Forestry
Until recently, detailing of joints was largely a matter of tradition, based on trial and error methods. However, in the engineering design of furniture, it is necessary for designers to create joints with a specified strength. This study was undertaken accordingly, to obtain the strength of round tenon/round mortise, rectangular tenon/rectangular mortise and rectangular tenon/round mortise joints assembled under nominally identical conditions with different end configurations. In addition, each end configuration was compared at rail widths, each with 2 widths of tenon. The results showed that rectangular end mortise and tenons are about 15% stronger than both round end mortise …
The Effect Of Crop Losses During Pre-Harvest And Harvest Periods On Production Costs In Tomato Production In The Ayaş And Nallıhan Districts Of Ankara Province, F. Füsun Tatlidi̇l, Taner Kiral, Erdemi̇r Gündoğmuş, Hali̇l Fi̇dan, Duygu Aktürk
The Effect Of Crop Losses During Pre-Harvest And Harvest Periods On Production Costs In Tomato Production In The Ayaş And Nallıhan Districts Of Ankara Province, F. Füsun Tatlidi̇l, Taner Kiral, Erdemi̇r Gündoğmuş, Hali̇l Fi̇dan, Duygu Aktürk
Turkish Journal of Agriculture and Forestry
The aim of this research was to analyze the impact on unit crop cost of crop losses that occur during the pre-harvest and harvest periods. It is understood today that crop losses occurring during these periods have an impact on crop cost and a negative effect on profit. The Ayaş and Nallıhan districts of Ankara province, where tomato production is carried out intensively, were selected as the research areas. Dwarf tomatoes are grown in the Ayaş district and indeterminate tomatoes in the Nallıhan district. A sample size of 74 for Ayaş and 34 for Nallıhan was calculated using a simple …
Effectiveness Of Bumblebee Pollination In Anti-Frost Heated Tomato Greenhouses In The Mediterranean Basin*, H. Yildiz Daşgan, A. Oğuz Özdoğan, Osman Kaftanoğlu, Kazim Abak
Effectiveness Of Bumblebee Pollination In Anti-Frost Heated Tomato Greenhouses In The Mediterranean Basin*, H. Yildiz Daşgan, A. Oğuz Özdoğan, Osman Kaftanoğlu, Kazim Abak
Turkish Journal of Agriculture and Forestry
Turkey has 22,000 ha of greenhouse area, and about 51% of vegetable greenhouses are used for tomato production. In Mediterranean countries generally greenhouses are not regularly heated at optimal levels. Fruity vegetables in winter have a problem of insufficient pollination due to low temperatures and isolated atmosphere. The aim of this study was to investigate the effectiveness of bumblebee (Bombus terrestris) pollination in tomato production in anti-frost heated greenhouses in the Mediterranean basin. Three fruit set applications, namely bumblebee, vibration and growth regulator, were used. Bumblebee pollination was compared to 2 other techniques that are commonly used in tomato greenhouses. …
Determination Of Sowing Dates Of Sweet Corn (Zea Mays L. Saccharata Sturt.) Under Şanlıurfa Conditions, Abdullah Öktem, A. Gülgün Öktem, Yalçin Coşkun
Determination Of Sowing Dates Of Sweet Corn (Zea Mays L. Saccharata Sturt.) Under Şanlıurfa Conditions, Abdullah Öktem, A. Gülgün Öktem, Yalçin Coşkun
Turkish Journal of Agriculture and Forestry
This study was conducted to determine optimum sowing dates for sweet corn in the Southeastern Anatolia region. The research was carried out at the Agricultural Research Station of Harran University in Şanlıurfa during 2000 and 2001. Sowing dates were April 25, May 10, May 25, June 10, June 25, July 10, July 25 and August 10. Based on the sowing dates, fresh ear yield, duration of tasseling, ear diameter, kernel numbers per ear, single fresh ear weight and husk ratio parameters were statistically significant (**P < 0.01) in both years. The highest fresh ear yields were 177.51 and 172.30 kg ha^{-1} for the 25 July sowing date in 2000 and 2001, respectively. The lowest fresh ear yields were 18.24 and 15.53 kg ha^{-1} for the April 25 sowing date in 2000 and 2001, respectively. Fresh ear yield decreased with early sowing dates (from April 25 to June 25) in both years. The results indicate that optimal sowing dates for sweet corn could be from June 25 to July 25 in Şanlıurfa and similar Southeastern Anatolia regions.
Field-Measured Furrow Infiltration Functions, Abolfazl Nasseri, Mohammad Reza Neyshabori, Ahmad Fakheri Fard, Mohammad Mogaddam, Amir Hossein Nazemi
Field-Measured Furrow Infiltration Functions, Abolfazl Nasseri, Mohammad Reza Neyshabori, Ahmad Fakheri Fard, Mohammad Mogaddam, Amir Hossein Nazemi
Turkish Journal of Agriculture and Forestry
Furrow infiltration varies with different variables and is a complex process for modeling infiltration over the field. This research was conducted to develop empirical relationships between field-wide furrow infiltration and independent variables such as the opportunity time, initial soil water content, flow depth, flow section area, wetted perimeter and wet bulk density. Furrow infiltration was measured by blocked furrow infiltrometers at 48 infiltration sites over a 70 x 130 m field plot. Simple and partial correlations between cumulative infiltration and independent variables were evaluated. The effects of wet bulk density and flow depth on cumulative infiltration were insignificant when the …
Development Of A Mathematical Model Using Dimensional Analysis For Predicting The Friction Losses In Drip Irrigation Laterals With Cylindrical Type In-Line Emitters, Vedat Demi̇r, Hüseyi̇n Yürdem, Adnan Deği̇rmenci̇oğlu
Development Of A Mathematical Model Using Dimensional Analysis For Predicting The Friction Losses In Drip Irrigation Laterals With Cylindrical Type In-Line Emitters, Vedat Demi̇r, Hüseyi̇n Yürdem, Adnan Deği̇rmenci̇oğlu
Turkish Journal of Agriculture and Forestry
This paper presents a prediction model developed using dimensional analysis for friction losses in drip irrigation laterals. Drip irrigation laterals with cylindrical type in-line emitters placed at different spacings ranging from 0.2 to 1 m were considered. The parameters affecting the variation in friction losses in laterals were defined as dimensionless terms using Buckingham's pi theorem. In order to develop a model, experimental friction loss data from 14 different drip irrigation pipes, and some domestic and some imported ones with the above-mentioned spacings were used. The model developed in this study accounted for 98.7% of the variation in the data. …
Some Technological Properties Of Laminated Veneer Lumber Manufactured From Pine (Pinus Sylvestris L.) Veneers With Melamine Added - Uf Resins, Semra Çolak, İsmai̇l Aydin, Cenk Demi̇rkir, Gürsel Çolakoğlu
Some Technological Properties Of Laminated Veneer Lumber Manufactured From Pine (Pinus Sylvestris L.) Veneers With Melamine Added - Uf Resins, Semra Çolak, İsmai̇l Aydin, Cenk Demi̇rkir, Gürsel Çolakoğlu
Turkish Journal of Agriculture and Forestry
The objectives of this study were to compare the modulus of elasticity, bending strength, shear strength and formaldehyde emissions of laminated veneer lumber (LVL) bonded with melamine added urea formaldehyde resin (UF+M) and produced with other resins such as urea-formaldehyde (UF), melamine-urea-formaldehyde (MUF) and phenol formaldehyde (PF), and to determine the effects of 2 different climate conditions on the bending strength and modulus of elasticity of pine LVL panels. After the panel production, the test specimens were divided into 2 groups for all tests. The first group of test specimens were conditioned at 20 °C and 45% R.H., while the …
An Analysis Of The Impacts Of Production Quotas And Ura Provisions On Turkey's Sugar Sector, Fahri̇ Yavuz
An Analysis Of The Impacts Of Production Quotas And Ura Provisions On Turkey's Sugar Sector, Fahri̇ Yavuz
Turkish Journal of Agriculture and Forestry
Sugar beet is an important crop in terms of production value and represents 2.5% of the total value of crop production. Its production has been regulated and supported by the government. To adapt Turkey's sugar policies for potential admission to the EU, a sugar production quota policy was implemented in 1999 in addition to existing policies, mainly including price support and input subsidies. At the same time, the tariff imposed on imported sugar was reduced by 10% in order to comply with Uruguay Round Agreement (URA) provisions. The objective here is to analyze the impacts of these policy changes on …
Crack Propagations And Fatigue Characteristics Of Some Handmade Papers*, Ari̇f Karademi̇r, Sami̇ İmamoğlu, Ni̇hat Sami̇ Çeti̇n
Crack Propagations And Fatigue Characteristics Of Some Handmade Papers*, Ari̇f Karademi̇r, Sami̇ İmamoğlu, Ni̇hat Sami̇ Çeti̇n
Turkish Journal of Agriculture and Forestry
In this work, a number of handsheets made from unbeaten and unbleached kraft, refiner mechanical and cotton linter pulps and crack propagations on paper samples under monotonic loading, were analyzed and possible links with the properties of fibrous networks were investigated. Crack initiation and propagation on the tested paper strips were also investigated under a scanning electron microscope to determine visually the state of the paper matrix under applied loads. Furthermore, paper samples were subjected to a series of mechanical tests, such as tearing resistance, folding endurance and tensile strength. The primary goal of this study concentrated on determining the …
Estimation Of Risk Efficient Farm Structures Along The Kızılırmak River In North Central Anatolia: An Application Of Minimization Of The Absolute Deviation, Vedat Ceyhan, H. Avni̇ Ci̇nemre
Estimation Of Risk Efficient Farm Structures Along The Kızılırmak River In North Central Anatolia: An Application Of Minimization Of The Absolute Deviation, Vedat Ceyhan, H. Avni̇ Ci̇nemre
Turkish Journal of Agriculture and Forestry
A risk-programming model was developed to evaluate the tradeoffs between risk and expected returns for farms along the Kızılırmak River in North Central Anatolia. Risk efficient farm structures were derived for representative farms by using minimization of the absolute deviation procedures, which permit the estimation of a farm's risk-return frontier. Research results reveal that farm plans are sensitive to the risk criteria in the research area. Rice and maize are the most high-risk activities, followed by lettuce and soybean. Wheat, sugar beet and dairy activities have a more stabilizing effect on farm income compared to others. Medium size and large …
Destructive Effects Of Classical Viscosimeters On The Microstructure Of Yoghurt Gel, Barbaros H. Özer
Destructive Effects Of Classical Viscosimeters On The Microstructure Of Yoghurt Gel, Barbaros H. Özer
Turkish Journal of Agriculture and Forestry
The effects of empirical viscosity measuring techniques that are commonly used in the determination of the viscosity of weak viscoelastic gels such as yoghurt on the microstructure of yoghurt were investigated by scanning electron microscopy (SEM). In the measurement of viscosity, Brookfield and Haake viscosimeters were employed at 2 different measuring periods (15 and 30 s). The results obtained indicated that the increase in the measuring period (15 s versus 30 s) stimulated the further destruction of the casein gel network. Additionally, the Brookfield viscosimeter was more destructive than the Haake viscosimeter. In general, lower viscosity values were in good …
The Effects Of Urban Green Spaces On House Prices In The Upper Northwest Urban Development Area Of Adana (Turkey), M. Faruk Altunkasa, Cengi̇z Uslu
The Effects Of Urban Green Spaces On House Prices In The Upper Northwest Urban Development Area Of Adana (Turkey), M. Faruk Altunkasa, Cengi̇z Uslu
Turkish Journal of Agriculture and Forestry
Green spaces have very important functions in the creation of a sustainable city. However, in cities, which grow in terms of their population and physical environment, the primary aim of city planning is to meet the housing deficit. For this reason, areas having natural characteristics within an urban area are destroyed and existing green spaces are turned into housing areas. The most important reason why green spaces are not prioritized in city planning is that there is no market representing the green spaces. The market value of green spaces is hard to quantify. The higher price paid by customers for …