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Agriculture

Journal

2005

Articles 61 - 71 of 71

Full-Text Articles in Life Sciences

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 Jan 2005

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 …

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Economic Threshold For Wild Radish (Raphanus Raphanistrum L.) Control In Wheat Fields, Özhan Boz Jan 2005

Economic Threshold For Wild Radish (Raphanus Raphanistrum L.) Control In Wheat Fields, Özhan Boz

Turkish Journal of Agriculture and Forestry

Field experiments were conducted in Aydın province in 1998 and 1999 to determine the economic threshold (ET) using florasulam + flumetsulam, 2,4-D amine, thifensulfuron methyl + tribenuron-methyl, and tribenuron-methyl for wild radish (Raphanus raphanistrum L.) in wheat. The effect of wild radish density (1, 2, 4, 8 and 16 plants m^{-2}) on wheat yield was investigated using an adjacent plot design with 4 fields. For each weed density, yield was compared with that in the adjacent weed-free control plot. The grain yield in wild radish-free wheat was 4079 kg ha^{-1} in 1998, 4369 kg ha^{-1} in 1999 and 4224 kg …

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Influence Of Seed Development And Seed Position On Oil, Fatty Acids And Total Tocopherol Contents In Sunflower (Helianthus Annuus L.), Hasan Baydar, Sabri̇ Erbaş Jan 2005

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 …

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Salinity Response Of Transgenic Potato Genotypes Expressing The Oxalate Oxidase Gene, Hakan Turhan Jan 2005

Salinity Response Of Transgenic Potato Genotypes Expressing The Oxalate Oxidase Gene, Hakan Turhan

Turkish Journal of Agriculture and Forestry

In vitro and in vivo responses of transgenic and non-transgenic potato (Solanum tuberosum L.) genotypes to salinity were investigated. A gene responsible for the production of oxalate oxidase enzyme, whose expression has been associated with plant stress tolerance, was used. Transgenic potato plants expressing the oxalate oxidase enzyme were produced using Agrobacterium-mediated transformation. The transgenic nature of the plants was verified by their antibiotic (kanamycin) resistance and then in vitro enzyme assays. Four independent transgenic genotypes obtained from 2 cultivars, Maris Bard and Desiree, were tested at 5 levels of NaCl (0%, 0.25%, 0.50%, 0.75% and 1.00% w/v) in vitro. …

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Development Of A Method For Priority Setting In Forestry Research Projects In Turkey, İsmet Daşdemi̇r Jan 2005

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 …

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Effects Of Mimosa Bark Usage On Some Properties Of Particleboard, Gökay Nemli̇, Gürsel Çolakoğlu Jan 2005

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 …

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Comparison Of Parameter Estimation Methods For The Three-Parameter Generalized Pareto Distribution, Teki̇n Özteki̇n Jan 2005

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 …

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A New Method For The Detection Of Minor Populations Of Citrus Tristeza Virus Strains Infecting Single Citrus Trees, Hani̇fe Genç Jan 2005

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 …

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Effects Of Different Tire Configurations On Tractor Performance, Sarp Korkut Sümer, Alaetti̇n Sabanci Jan 2005

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 …

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Effect Of Storage Time On Some Mechanical Properties And Bruise Susceptibility Of Pears And Apples, Yeşi̇m Benal Yurtlu, Doğan Erdoğan Jan 2005

Effect Of Storage Time On Some Mechanical Properties And Bruise Susceptibility Of Pears And Apples, Yeşi̇m Benal Yurtlu, Doğan Erdoğan

Turkish Journal of Agriculture and Forestry

This research was conducted to evaluate the effect of storage time on some mechanical properties and bruise susceptibility of Williams and Ankara varieties of pear and Starkspur Golden Delicious and Starking varieties of apple. The research was performed in 2 stages. Firstly, compression tests were conducted to determine the mechanical properties of fruits. Secondly, an impact test was used to determine the bruise susceptibility of test materials. Impact tests were performed using a pendulum with 50 cm arm length. The tests were carried out at 5 storage times (harvest day, 1^{st}, 2^{nd}, 3^{rd} and 4^{th} month) and 3 drop heights …

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Fifth Year Performance Of Morphologically Graded Cedrus Libani Seedlings In The Central Anatolia Region Of Turkey, Akkin Semerci̇ Jan 2005

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, …

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