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Articles 31 - 53 of 53
Full-Text Articles in Forest Sciences
Chromosome Association In Allotetraploid Interspecific Hybrid Ryegrass And Parental Species, Bi̇lal Deni̇z
Chromosome Association In Allotetraploid Interspecific Hybrid Ryegrass And Parental Species, Bi̇lal Deni̇z
Turkish Journal of Agriculture and Forestry
This study was carried out in glasshouse conditions in summer 2000. Metaphase I (MI) chromosome association and numbers of chromosome arms bound were studied in autotetraploid perennial (Lolium perenne L.) and annual ryegrass (Lolium multiflorum Lam.) and their interspecific hybrid plants (Lolium hybridum). In addition, the relationships among different cytological characteristics with respect to meiotic regularity were determined. Chromosome associations at MI were often regular in the parent species and hybrid ryegrass plants however different pairing irregularities were found to be higher in perennial and especially in hybrid ryegrass plants than in the annual ryegrass plant genotypes. Total bivalent pairing …
Amelioration Of Chilling Injuries In Watermelon Seedlings By Abscisic Acid, Ahmet Korkmaz
Amelioration Of Chilling Injuries In Watermelon Seedlings By Abscisic Acid, Ahmet Korkmaz
Turkish Journal of Agriculture and Forestry
A greenhouse study, designed in a randomized complete block design with five replications, was carried out at Clemson University, Clemson, SC, USA, in the spring of 1997. The objective of the study was to investigate whether abscisic acid (ABA) would mitigate chilling damages in the watermelon, a chilling-sensitive plant. 'Crimson Sweet' [Citrullus lanatus (Thumb) Matsum. & Nakai.] watermelon seedlings were grown in a greenhouse with a temperature regime of 25ºC (day) and 20ºC (night). Five-day-old seedlings were sprayed with 10^{-4} M cis, trans-abscisic acid 15 hours prior to being exposed to 1.5 ± 0.5ºC for 24 hours in a dark …
Effects Of Seed Origin And Site On Wood Density Of Sitka Spruce (Picea Sitchensis (Bong.) Carr.) Grown In Britain, İlker Usta, Mike Hale
Effects Of Seed Origin And Site On Wood Density Of Sitka Spruce (Picea Sitchensis (Bong.) Carr.) Grown In Britain, İlker Usta, Mike Hale
Turkish Journal of Agriculture and Forestry
Since density may have a direct influence on wood properties and because density is a factor under genetic control, this study details the effects of seed origins and sites on density. In addition to seed origins, its variability both within and between trees was also examined. In this case, the variation in density was investigated in eight seed origins of Sitka spruce (Alaska-AL, British Columbia-BC, Queen Charlotte Islands-QCI, North Washington-NW, South Washington-SW, North Oregon-NO, South Oregon-SO, and California-CA) grown at two sites in Britain (Dalby: Eastern England and Rhondda: South Wales). For this purpose, the five trees of each seed …
Factors Affecting The Production Of E1 Type Particleboard, Gökay Nemli̇
Factors Affecting The Production Of E1 Type Particleboard, Gökay Nemli̇
Turkish Journal of Agriculture and Forestry
This study aimed to determine the best manufacturing variables for the high physical and mechanical properties, and formaldehyde emission of particleboards produced from E_1 type adhesive. In the production of particleboards, two different press temperatures, press times, pressures and three different adhesive use ratios were used. The best manufacturing variables were determined for the particleboard produced from E_1 type adhesive. The effects of these manufacturing variables on formaldehyde emission, bending strength, internal bonding strength and thickness swelling were investigated. According to the results, when the E_1 type adhesive was employed, the use of 11% and 9% adhesive use ratios for …
Hydraulic Conductivity Evaluation For A Drainage Simulation Model (Drainmod), Teki̇n Özteki̇n
Hydraulic Conductivity Evaluation For A Drainage Simulation Model (Drainmod), Teki̇n Özteki̇n
Turkish Journal of Agriculture and Forestry
The objective of this study was to determine the most suitable saturated hydraulic conductivity (K) values as input into DRAINMOD among a range of K data sets developed for the drainage experiment site in North Central Ohio using seven different K estimation methods. The K methods evaluated were monolith, core, auger-hole, MUUF soil database, and using the Hooghoudt, Kirkham, and van Schilfgaarde equations with water table drawdown and drainage discharge data. Simulations using DRAINMOD (Version 4.6) were conducted for the years 1962-1964 and 1967-1971, and runoff and drain discharge predictions were compared with measured discharges. The analyses showed that none …
Estimation Of Instantaneous Peak Flows In Seyhan River Basin Using Regional Regression Procedures, Fati̇h Topaloğlu
Estimation Of Instantaneous Peak Flows In Seyhan River Basin Using Regional Regression Procedures, Fati̇h Topaloğlu
Turkish Journal of Agriculture and Forestry
Multivariate procedures for estimating instantaneous flood flows for various return periods in Seyhan river basin are presented in the study. Procedures aim at developing regression equations uscable for the basin using annual peak instantaneous flows, climatic and morphometric charactcristics. It was determined that best subset analysis gave the highest determination coefficients (91.0%
Effects Of Pruning Treatments On The Yield And Fruit Quality Of Precoce De Tyrinthe Apricot Cultivar, Levent Son, Ali̇ Küden
Effects Of Pruning Treatments On The Yield And Fruit Quality Of Precoce De Tyrinthe Apricot Cultivar, Levent Son, Ali̇ Küden
Turkish Journal of Agriculture and Forestry
This study was carried out to determine the effects of pruning on the yield, fruit quality and phenological aspects of three year-old trees of the Precoce de Tyrinthe apricot cultivar grown in Mut-Mersin. In the first experimental year, unpruned trees were found to be more productive; however, these trees gave lower yields (6.5 kg/tree) in the second year due to alternate bearing. August+winter (12.0 kg/tree), July+winter (10.4 kg/tree), and September+winter (10.1 kg/tree) pruning applications were more productive than control trees (6.50 kg/tree). The fruit size of the control trees was 34.05 g, while September+winter (45.66 g), August+winter (44.70 g), and …
Development, Survival And Reproduction Of Three Coccinellids Feeding On Hyalopterus Pruni (Geoffer) (Homoptera: Aphididae), Remzi̇ Atlihan, Mehmet Bora Kaydan
Development, Survival And Reproduction Of Three Coccinellids Feeding On Hyalopterus Pruni (Geoffer) (Homoptera: Aphididae), Remzi̇ Atlihan, Mehmet Bora Kaydan
Turkish Journal of Agriculture and Forestry
The development, survival and fecundity of three aphidophagus coccinellid species, Scymnus apetzi (Mulsant), Scymnus subvillosus (Goeze) and Exochomus nigromaculatus (Goeze), were studied under laboratory conditions (25 ± 1, 65 ± 5% RH and 16 L/8D). Development time from egg to adult was 20.4, 17.1 and 16.7 days for S. apetzi, S. subvillosus and E. nigromaculatus, respectively. Mortality rate from egg to adulthood was highest for S. apetzi (37.9%) followed by S. subvillosus (36.3%) and E. nigromaculatus (25.7%). Duration of the oviposition period was 58.6, 64.9 and 75.3 days, and the total number of eggs per female was 492.8, 224.9 and …
Microscopic Evaluation Of Interactions Between Varieties Of Arabidopsis Thaliana Challenged By Peronospora Parasitica, Fi̇gen Mert Türk
Microscopic Evaluation Of Interactions Between Varieties Of Arabidopsis Thaliana Challenged By Peronospora Parasitica, Fi̇gen Mert Türk
Turkish Journal of Agriculture and Forestry
Peronospora parasitica (Pers ex Fr.) Pers. is an obligate biotrophic pathogen that causes downy mildew in Arabidopsis thaliana (L.) Heynh. In this study, cotyledons of four A. thaliana varieties were inoculated with the Cala2 isolate of P. parasitica and the degree of susceptibility was observed under the microscope 1, 2, 3 and 7 days after inoculation (DAI). Microscopic examination of infected tissues revealed that early restriction of the pathogen was accompanied by a hypersensitive response (HR) characterised by autofluorescence under UV or blue light excitation. All haustoria, if visible at all, formed in the cells that underwent the HR in …
Root Yield And Quality Of Sugarbeet In Relation To Sowing Date, Plant Population And Harvesting Date Interactions, Ramazan Çakmakçi, Erol Oral
Root Yield And Quality Of Sugarbeet In Relation To Sowing Date, Plant Population And Harvesting Date Interactions, Ramazan Çakmakçi, Erol Oral
Turkish Journal of Agriculture and Forestry
Sowing date, plant density and harvest date are important factors affecting root yield and quality of sugar beet (Beta vulgaris L.). The effects of sowing date (beginning of April, mid-April, the end of April, mid-May, and the end of May), plant density, and harvest date (the end of September and mid-October) on sugar beet yield and quality were studied in trials in the Eastern Anatolia region on a loam soil in 1994-97. Variation in plant density was obtained by combining two seed distances and two target emergence percentages. Plant populations for the different treatments reached 55 500, 73 000, 88 …
Kinetic Studies With Crude Tomato Alcohol Dehydrogenase, Emi̇n Yilmaz
Kinetic Studies With Crude Tomato Alcohol Dehydrogenase, Emi̇n Yilmaz
Turkish Journal of Agriculture and Forestry
Tomato alcohol dehydrogenase (ADH) is very important in the formation of fresh tomato aroma volatiles. The kinetic characterization and isolation of this enzyme may promote some in vitro applications. Kinetic studies of crude tomato ADH associated with NAD^+ cofactor revealed Km values of 2.03 mM for ethanol and 0.064 mM for NAD^+, a Vmax value of 24.51 µM/min, and an activation energy of 0.0208 kcal/mole. Variable pH measurements indicated that the enzyme is optimally active in a narrow range above pH 8.5. Dalziel coefficients were consistent with a sequential but not ordered mechanism. Also the enzyme was found to be …
Principal Mechanical Properties Of Eastern Beech Wood (Fagus Orientalis Lipsky) Naturally Grown In Andırın Northeastern Mediterranean Region Of Turkey, İbrahi̇m Bektaş, Cengi̇z Güler, M. Altay Baştürk
Principal Mechanical Properties Of Eastern Beech Wood (Fagus Orientalis Lipsky) Naturally Grown In Andırın Northeastern Mediterranean Region Of Turkey, İbrahi̇m Bektaş, Cengi̇z Güler, M. Altay Baştürk
Turkish Journal of Agriculture and Forestry
The aim of this study was to determine some mechanical properties (compression, static bending, impact bending and shear strengths) of Eastern beech wood (Fagus orientalis Lipsky) and to compare with them other beech species. In the tests, randomly selected logs taken from the trunk 2-4 m height were obtained from trees naturally growing in Andırın (Northeastern Mediterranean region) and these logs were prepared and tested according to Turkish standards. The results showed that the mean compression strength was 606 kgcm^{-2}, static bending strength 1204 kgcm^{-2}, impact bending strength 0.85 kgmcm^{-2} and shear strength 99 kgcm^{-2}. The relations of strengths with …
Effects Of Surface Coating Materials On The Thermal Conductivity And Combustion Properties Of Particleboard, Gökay Nemli̇, Hülya Kalaycioğlu
Effects Of Surface Coating Materials On The Thermal Conductivity And Combustion Properties Of Particleboard, Gökay Nemli̇, Hülya Kalaycioğlu
Turkish Journal of Agriculture and Forestry
The specific properties of particleboard samples used in this study were as follows: 280x210x1.8 cm dimensions, 0.68 g/cm^3 specific gravity. Produced boards were coated with lacquered paint, melamine impregnated papers, wood veneers and continue press laminates. The effects of surface coating material type, melamine paper weight, wood veneer type and thickness, and continue press laminate thickness on the thermal conductivity and combustion properties of particleboard were investigated. Results showed that surface coating material type was found to affect these properties. Melamine paper weight and wood veneer thickness did not affect the thermal conductivity and combustion properties of particleboard samples. Wood …
Simulating Water Flow To A Subsurface Drain In A Layered Soil, Teki̇n Özteki̇n
Simulating Water Flow To A Subsurface Drain In A Layered Soil, Teki̇n Özteki̇n
Turkish Journal of Agriculture and Forestry
The objective of the work presented in this paper was to simulate drain flow into subsurface drainage pipes for a layered soil profile using a finite element based HYDRUS-2D model. Data from the drainage experiment in North Central Ohio were used as input to the model. Studies were conducted to determine the ability of the model to predict drain discharge-water table elevation relationships. The model was also used to evaluate the effect of backfill on drain discharge-water table elevation relationships. HYDRUS-2D underpredicted drain discharge compared to the empirical and Kirkham-Hooghoudt equations for water table elevations above 70 cm. However, HYDRUS-2D …
Determining Suitable Probability Distribution Models For Flow And Precipitation Series Of The Seyhan River Basin, Fati̇h Topaloğlu
Determining Suitable Probability Distribution Models For Flow And Precipitation Series Of The Seyhan River Basin, Fati̇h Topaloğlu
Turkish Journal of Agriculture and Forestry
The frequency analysis of the largest, or the smallest, of a sequence of hydrologic events has long been an essential part of the design of hydraulic structures. Therefore, the question of better fit among countless probability models used in frequency analysis is always a fresh one. The purpose of this study was to make a statistical comparison of currently popular probability models. Therefore, Gumbel, log-Logistic, Pearson-3, log-Pearson-3 and log-Normal-3 distributions were applied to the series of annual instantaneous flood peaks and annual peak daily precipitation for 13 flow gauging and 55 precipitation gauging stations in the Seyhan basin, respectively. The …
Comparison Of Rooting Capabilities Of Turkish Tea Clones, Eyyüp Altindal, Fi̇kri̇ Balta
Comparison Of Rooting Capabilities Of Turkish Tea Clones, Eyyüp Altindal, Fi̇kri̇ Balta
Turkish Journal of Agriculture and Forestry
In this study, single leaf cuttings of 10 Turkish tea (Camellia sinensis) clones Hamzabey-1, Ardeşen-1, Fener-3, Hayrat-1, Çiftekavak-1, Muradiye-10, Tuğlalı-10, Gündoğdu-3, Kömürcüler-1 and Derepazarı-7 were rooted under greenhouse conditions at seven different collection times without using any plant hormones. The cuttings were collected on 28 August, 4 September, 11 September, 19 September, 25 September, 4 October and 10 October. Rooted plants were removed from rooting medium in mid-May. Plant survival, root dry weight, shoot dry weight and shooting percentage were recorded depending on the tea clones and collection times. The highest survival percentage by mean values of collection times was …
Natural Forest Types And Their Differential Species On Genya Mountain-Artvin, Si̇nan Güner, Ali̇ Demi̇rci̇, Fati̇h Tonguç
Natural Forest Types And Their Differential Species On Genya Mountain-Artvin, Si̇nan Güner, Ali̇ Demi̇rci̇, Fati̇h Tonguç
Turkish Journal of Agriculture and Forestry
To be successful in forestry practices, all factors affecting forests and the interactions among them should be determined. It is important to study and understand the structure and dynamics of forests and make an inventory of existing and non-degraded homogeneous areas of natural forest types in the country. This study was conducted to determine different forest types and their differential species on Genya Mountain in Artvin. Based on the results determined by the Braun-Blanquet method, a total of 8 forest types and 2 typical sub-forest types for type IV, and 3 typical sub-forest types for type VIII were determined. These …
Socio-Economic Structural Analysis Of Small Firms In The Forest Product Industry In The Eastern Black Sea Region In Turkey, Kadri̇ Cemi̇l Akyüz, Hi̇cabi̇ Cindik, Hasan Seri̇n
Socio-Economic Structural Analysis Of Small Firms In The Forest Product Industry In The Eastern Black Sea Region In Turkey, Kadri̇ Cemi̇l Akyüz, Hi̇cabi̇ Cindik, Hasan Seri̇n
Turkish Journal of Agriculture and Forestry
Structural and statistical analyses of small establishments in the forest products industry were performed in 63 towns and cities in six provinces in the Eastern Black Sea region, which is relatively less developed than many other regions in Turkey. The other objective of this study was to classify the establishments by using various factors. Correlation, cluster and discriminate analysis were used for classification of these establishments. Twenty-five various factors, collected especially from workers, were analyzed. The study was realized using questionnaire forms, filled in with the face-to-face communication method. As a result, 341 questionnaire forms were filled out in 63 …
Comparison Of Determinate And Indeterminate Types Of Sesame For Oil Content And Fatty Acid Composition, Bülent Uzun, Sali̇h Ülger, M. İlhan Çağirgan
Comparison Of Determinate And Indeterminate Types Of Sesame For Oil Content And Fatty Acid Composition, Bülent Uzun, Sali̇h Ülger, M. İlhan Çağirgan
Turkish Journal of Agriculture and Forestry
Determinate growth habit in sesame is not available in nature originally. The character was a mutant induced by gamma rays and has the potential to make possible mechanised harvesting in sesame by enabling synchronous flowering. Though no detailed study on fatty acids of determinate types has been recently performed, much material is available on the genotypes of indeterminates. Therefore, the present study aimed to compare determinate and indeterminate types of sesame with regard to oil content and fatty acid composition. A total of 10 genotypes, six determinate and four indeterminate types, were grown in a randomised complete blocks design with …
Plant Parasitic Nematode Species Of Tylenchida (Nematoda) Associated With Sesame (Sesamum Indicum L.) Growing In The Mediterranean Region Of Turkey, İlker Kepenekci̇
Plant Parasitic Nematode Species Of Tylenchida (Nematoda) Associated With Sesame (Sesamum Indicum L.) Growing In The Mediterranean Region Of Turkey, İlker Kepenekci̇
Turkish Journal of Agriculture and Forestry
Plant parasitic nematodes (Tylenchida: Nematoda) found on sesame (Sesamum indicum L.) growing in the Mediterranean region of Turkey were examined faunistically and taxonomically. This study was carried out in two provinces (Antalya and İçel) important for the cultivation of sesame during the summer of 1998. Samples were taken from 20 different sesame fields and examined in the laboratory. By the end of our research 23 species were identified. Two of these (Helicotylenchus abunaamai Siddiqi and Paratylenchus rotundicephalus Bajaj) are species which have never been recorded in Turkey. Their identification, distribution in the Mediterranean region, and morphological and morphometric characteristics are …
The Possibilities Of Using Pheromone Traps And Total Thermal Summation In Estimating Adult Emergence Of Pectinophora Gossypiella (Saund.), A Pest Of Cotton Growing Areas In Amik Plain, Cafer Mart, Oğuzhan Doğanlar, Şener Tarla
The Possibilities Of Using Pheromone Traps And Total Thermal Summation In Estimating Adult Emergence Of Pectinophora Gossypiella (Saund.), A Pest Of Cotton Growing Areas In Amik Plain, Cafer Mart, Oğuzhan Doğanlar, Şener Tarla
Turkish Journal of Agriculture and Forestry
In 1996-1999, studies on the utilization of pheromone traps for the estimation of adult emergence and the observation of the seasonal population dynamics of Pectinophora gossypiella (Saund.), which tends to spread in cotton growing areas, and on the determination of day-degree values for its biological stages were carried out in Amik Plain. It was found that adult emergence of the overwintering generation first occurred between late April and early May and lasted for 2-2.5 months. The effective total summation for first adult emergence was 136.43, 137.43 and 186.95 day-degree, and that for maximum adult emergence was 570.80, 460.23 and 479.35 …
The Effect Of Wheat Straw, Corn Straw And Tobacco Residues On Denitrification Losses In A Field Planted With Wheat, Ali̇ Coşkan, Mustafa Gök, Işik Onaç, İlker İnal, Turan Sağlamti̇mur
The Effect Of Wheat Straw, Corn Straw And Tobacco Residues On Denitrification Losses In A Field Planted With Wheat, Ali̇ Coşkan, Mustafa Gök, Işik Onaç, İlker İnal, Turan Sağlamti̇mur
Turkish Journal of Agriculture and Forestry
A field experiment was conducted to determine the effects of different organic residues (OR) (e.g., wheat straw corn straw and tobacco residues) on nitrogen mineralization and denitrification loss (N_2O-N) using application rates recommended to local farmers. Nitrate and ammonium analyses were carried out on periodically collected soil samples. In-situ denitrification loss was determined using the acetylene inhibition technique (AIT). The results revealed that OR application increased N mineralization significantly. In the favorable conditions for nitrification and intensive mineralization period, NO_3^--N accumulation at 0-60 cm depth peaked at 163.0, 177.7 and 226.6 kg N ha^{-1} in plots with wheat straw, corn …
Determination Of Genetic Variation In Populations Of Bemisia Tabaci In Antalya, Hüseyi̇n Göçmen, Zübeyi̇r Devran
Determination Of Genetic Variation In Populations Of Bemisia Tabaci In Antalya, Hüseyi̇n Göçmen, Zübeyi̇r Devran
Turkish Journal of Agriculture and Forestry
Although a number of investigations on the molecular genetics of Bemisia tabaci (Gennadius) have appeared in the literature, no such studies are known from Turkey. In order to fill this gap the amplified fragment length polymorphism (AFLP) technique was used to assay eight populations of B. tabaci collected from cotton, protected vegetables (tomato, cucumber and eggplant) and peppermint in various locations in the province of Antalya, Turkey. Eleven AFLP primer pairs detected a total of 547 AFLP fragments in these populations and 389 of these showed polymorphism. Cluster analyses of AFLP data clearly separated these populations into two groups with …