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2003

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Articles 331 - 354 of 354

Full-Text Articles in Agriculture

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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Effects Of Some Manufacturing Factors On The Properties Of Particleboard Manufactured From Alder (Alnus Glutinosa Subsp. Barbata), Gökay Nemli̇ Jan 2003

Effects Of Some Manufacturing Factors On The Properties Of Particleboard Manufactured From Alder (Alnus Glutinosa Subsp. Barbata), Gökay Nemli̇

Turkish Journal of Agriculture and Forestry

In this study, Alder (Alnus glutinosa subsp.Barbata) wood was used for particleboard manufacturing. The purpose of this study was to determine the effects of particle moisture content, shelling ratio and the addition of wood dust on the mechanical properties (static bending, modulus of elasticity and internal bond) and physical property (thickness swelling) of particleboard. The addition of 10% wood dust to particles decreased the thickness swelling, modulus of elasticity and bending strength, while increasing the internal bond. Particleboards manufactured from particles with 1% moisture content had lower internal bond, modulus of elasticity and bending strength and higher thickness swelling values …

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Soil Erosion Risk Assessment With Icona Model; Case Study: Beypazarı Area, İlhami̇ Bayrami̇n, Orhan Dengi̇z, Oğuz Başkan, Mehmet Parlak Jan 2003

Soil Erosion Risk Assessment With Icona Model; Case Study: Beypazarı Area, İlhami̇ Bayrami̇n, Orhan Dengi̇z, Oğuz Başkan, Mehmet Parlak

Turkish Journal of Agriculture and Forestry

In this research, the applicability of geographic information system (GIS) and remote sensing (RS) techniques was tested to assess soil erosion risk with the ICONA erosion model. This study was carried out in the Ankara-Beypazarı area because of its variety of diverse landforms, land uses and land covers. The erosion risk assessment phase of this model consists of seven steps that mainly use slope, geology, land use and land cover information. A potential erosion risk map (step 3) was obtained from the slope (step 1) and lithofacies layers (step 2) generated using a digital elevation model (DEM) and digital geological …

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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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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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Geographic Information System And Remote Sensing Based Land Evaluation Of Beypazarı Area Soils By Ilsen Model, Orhan Dengi̇z, İlhami̇ Bayrami̇n, Mahmut Yüksel Jan 2003

Geographic Information System And Remote Sensing Based Land Evaluation Of Beypazarı Area Soils By Ilsen Model, Orhan Dengi̇z, İlhami̇ Bayrami̇n, Mahmut Yüksel

Turkish Journal of Agriculture and Forestry

Land evaluation is of great importance in guiding decisions on land uses in terms of their potential and conserving natural resources for future generations. The main objective of this study was to determine land resources and to evaluate land utilization types and their suitability in Beypazarı area soils. In addition to field studies, digital soil and land use related (satellite data, DEM and digital geology maps) data were used and analyzed with remote sensing (RS) and geographic information systems (GIS) techniques and a new digital soil map and database were generated for the study area. Soils were classified using soil …

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Determining The Strength Properties Of The Dixired Peach Variety, Kubi̇lay K. Vursavuş, Faruk Özgüven Jan 2003

Determining The Strength Properties Of The Dixired Peach Variety, Kubi̇lay K. Vursavuş, Faruk Özgüven

Turkish Journal of Agriculture and Forestry

Peaches, like other fruits, are susceptible to different kinds of damage during and after harvest. Such damage is a major cause of quality loss in fruit. In order to reduce these losses, it is necessary to know the strength properties of fruit. Some strength properties of "Dixred" peaches are investigated in this paper. Peaches were stored at 0 ºC and 90% relative humidity for specified lengths of time. Impact treatment was applied by a pendulum impactor at four energy levels. Bruise volume was measured in the bruised peaches after impact, and bruise susceptibility was calculated from the linear regression line …

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Effect Of Cadmium On Growth And Concentrations Of Cadmium, Ascorbic Acid And Sulphydryl Groups In Durum Wheat Cultivars, Levent Öztürk, Seli̇m Eker, Faruk Özkutlu, İsmai̇l Çakmak Jan 2003

Effect Of Cadmium On Growth And Concentrations Of Cadmium, Ascorbic Acid And Sulphydryl Groups In Durum Wheat Cultivars, Levent Öztürk, Seli̇m Eker, Faruk Özkutlu, İsmai̇l Çakmak

Turkish Journal of Agriculture and Forestry

By using two durum wheat cultivars (Triticum durum L. cvs. Balcali-85 and C-1252) a nutrient solution experiment was carried out to study i) genotypic variation in cadmium (Cd) tolerance, ii) Cd concentrations in plants, and iii) the role of ascorbic acid and non-protein SH groups (SH: sulphydryl) in Cd tolerance. Plants were grown under controlled climatic conditions for 15 days and subjected to increasing Cd supply (0, 6, 30, 75 and 150 µM). Of the two cultivars, C-1252 showed greater sensitivity to Cd toxicity as judged from the severity of Cd toxicity symptoms on leaves. Increasing Cd supply markedly reduced …

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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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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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Studies On Lignin-Based Adhesives For Particleboard Panels, Ni̇hat Sami̇ Çeti̇n, Ni̇lgül Özmen Jan 2003

Studies On Lignin-Based Adhesives For Particleboard Panels, Ni̇hat Sami̇ Çeti̇n, Ni̇lgül Özmen

Turkish Journal of Agriculture and Forestry

The ultimate aim of this work was to develop a phenolic resin for partially replacing phenol with modified organosolv lignin in phenol-formaldehyde (PF) resin production. The lignin-formaldehyde relationship was determined in a reactivity test. Organosolv lignin-phenol-formaldehyde (LPF) resins were produced in a two-step preparation with different additions of lignin. The method selected for the manufacture of lignin resins dealt with modification of the lignin by the methylolation route. The effects of different substitution levels of organosolv lignin on strength properties were evaluated by testing lignin resin impregnated paper strips. A comparison of the tensile properties of organosolv lignin formulations, impregnated …

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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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Determination Of Superior Parents And Hybrid Combinations In Respect To Lint Yield And Yield Components In Cotton (Gossypium Hirsutum L.), Mehmet Mert, Oktay Gençer, Yaşar Akişcan, Kenan Boyaci Jan 2003

Determination Of Superior Parents And Hybrid Combinations In Respect To Lint Yield And Yield Components In Cotton (Gossypium Hirsutum L.), Mehmet Mert, Oktay Gençer, Yaşar Akişcan, Kenan Boyaci

Turkish Journal of Agriculture and Forestry

The purpose of this study was to determine estimates of the general combining ability of parents and the specific combining ability of hybrids needed to develop high yielding cotton cultivars. Five cotton lines (Sure Grow 125, Sure Grow 404, Sure Grow 501, Sure Grow 1001 and Çukurova 1518) and 7 testers (PAUM 400, PAUM 401, PAUM 402, PAUM 403, PAUM 404, PAUM 405 and PAUM 406) were crossed in a line x tester mating system at Çukurova University, Cotton Research and Application Center, Adana, Turkey, in 2000. Twelve genotypes and 35 F_1 hybrids were sown in a randomized complete block …

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Comparison Of The Performance Of Autumn And Spring Sowing Of Chickpeas In A Temperate Region, Sai̇m Özdemi̇r, Ufuk Karadavut Jan 2003

Comparison Of The Performance Of Autumn And Spring Sowing Of Chickpeas In A Temperate Region, Sai̇m Özdemi̇r, Ufuk Karadavut

Turkish Journal of Agriculture and Forestry

The effects of autumn and spring sowing on chickpea yield were investigated by examining yield components in a 2-year (2000-2001 and 2001-2002 growing seasons) field experiment in a temperate region, in north-west Turkey. Twenty-one chickpea genotypes (2 registered varieties of winter type for the Mediterranean region and 19 breeding lines) were evaluated in 2 sowing seasons (autumn and spring). Autumn-sown crops were subjected to -2.1 °C and snow cover twice (2 and 4 days) in the first year and -7.6 °C and snow cover 3 times (8, 14 and 6 days) in the second year. All genotypes were resistant to …

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Kinetics Of Nonenzymatic Browning Reaction In Citrus Juice Concentrates During Storage, Nuray Koca, Hande Selen Burdurlu, Feryal Karadeni̇z Jan 2003

Kinetics Of Nonenzymatic Browning Reaction In Citrus Juice Concentrates During Storage, Nuray Koca, Hande Selen Burdurlu, Feryal Karadeni̇z

Turkish Journal of Agriculture and Forestry

The kinetics of nonenzymatic browning in citrus juice concentrates (orange, lemon, grapefruit and tangerine) during 8 weeks of storage at 28, 37 and 45 ºC were investigated. Browning development was followed by measuring absorbance at 420 nm (A_{420}) and using CIE-Lab color system. Analysis of kinetic data from A_{420} values suggested a zero-order reaction for nonenzymatic browning, while changes in L* and b* parameters followed a first-order reaction. Activation energy for nonenzymatic browning determined by A_{420} values ranged from 17.60 to 35.27 kcal mol^{-1}, while those for L* and b* parameters were 6.67-28.99 kcal mol^{-1} and 15.38-34.2 kcal mol^{-1}, respectively. …

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Hydrolysis Of Polysaccharides With 77% Sulfuric Acid For Quantitative Saccharification, Güneş Uçar, Mualla Balaban Jan 2003

Hydrolysis Of Polysaccharides With 77% Sulfuric Acid For Quantitative Saccharification, Güneş Uçar, Mualla Balaban

Turkish Journal of Agriculture and Forestry

Classical standard hydrolysis of polysaccharides with 72% sulfuric acid was modified in 2 manners. In order to avoid treatment in an autoclave at 120 °C under pressure, wood or pulp material was first swollen in cold 77% acid followed by hydrolysis steps in diluted acid solutions. Further, the neutralization of the hydrolyzate with dilute barium hydroxide was carried out in heated mother liquor ensuring a crystalline precipitate of barium sulfate. Digestion enables the separation of clear aliquots by decantation in large amounts for analysis by HPLC. The modified procedure allows hydrolyses of polysaccharides with low losses as indicated by correction …

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Measuring The Market Power Of The Banana Import Market In Turkey, Seli̇m Adem Hatirli, Eugene Jones, Ali̇ Riza Aktaş Jan 2003

Measuring The Market Power Of The Banana Import Market In Turkey, Seli̇m Adem Hatirli, Eugene Jones, Ali̇ Riza Aktaş

Turkish Journal of Agriculture and Forestry

Banana production in Turkey represents a small fraction of that required to meet domestic consumption. Domestic consumption totaled 188,000 t in 2000, whereas production amounted to just 64,000 t, or 34% of consumption. The gap between consumption and production is made up by imports and 5 multinational firms control the flow of more than 80% of the global banana trade. Given this firm dominance in the world trade of bananas, oligopoly theory would suggest the presence of underlying structural forces that could facilitate price-enhancing market power. As such, this study develops an integrated trade and new empirical industrial organization (NEIO) …

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Apple Grading Using Fuzzy Logic, İsmai̇l Kavdir, Daniel E. Guyer Jan 2003

Apple Grading Using Fuzzy Logic, İsmai̇l Kavdir, Daniel E. Guyer

Turkish Journal of Agriculture and Forestry

Classification is vital for the evaluation of agricultural produce. However, the high costs, subjectivity, tediousness and inconsistency associated with manual sorting have been forcing the post harvest industry to apply automation in sorting operations. Fuzzy logic (FL) was applied as a decision making support to grade apples in this study. Quality features such as the color, size and defects of apples were measured through different equipment. The same set of apples was graded by both a human expert and a FL system designed for this purpose. Grading results obtained from FL showed 89% general agreement with the results from the …

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Factors Affecting Plant Location Decisions Of U.S. Broiler Executives, Pramod Sambidi Jan 2003

Factors Affecting Plant Location Decisions Of U.S. Broiler Executives, Pramod Sambidi

LSU Master's Theses

The broiler operations in the United States, which are concentrated in the southeast and south central regions are unevenly distributed within those states. The major concern for Louisiana¡¯s broiler industry is that even though its production is increasing every year it is relatively low compared to many other southeastern states. This study analyzes the relative importance of factors that affect location decision of a broiler complex. A national survey of broiler industry executives is conducted to analyze site-specific factors related to the broiler-complex location problem. Conjoint analysis is used to measure the relative importance of each attribute in the location …

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Establishing The Economic Impact Of The Green Industry On Louisiana's Economy, Raul A. Pinel Jan 2003

Establishing The Economic Impact Of The Green Industry On Louisiana's Economy, Raul A. Pinel

LSU Master's Theses

The general objective of this study was to provide updated estimates of value of the green industry in Louisiana. Data collection was conducted for the production sector (Nursery Growers and Sod Producers, and Landscape Design, Installation and Maintenance Services) and the Golf Industry. In addition, expenditures on green industry products and services incurred by other sectors were obtained. Among those sectors were churches and cemeteries, public schools (elementary and secondary), public colleges and universities, private schools (elementary, secondary and college/university), parish/city grounds, state parks, road shoulder and median maintenance, and airports. To conduct the surveys, listings from those sectors were …

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Analyzing Changes In Contractual Practices In The Louisiana Nursery Industry, Roberto E. Navajas Jan 2003

Analyzing Changes In Contractual Practices In The Louisiana Nursery Industry, Roberto E. Navajas

LSU Master's Theses

The flow of nursery products through the different market channels has changed over the past decade. As mass-merchandisers’ market share increased, buyers of nursery product imposed conditions on nursery growers in terms of their business practices as well as the presentation of the product itself. This study analyzed changes in contractual terms between buyer and sellers for two market channels; mass-merchandisers and garden centers. The items evaluated were that product information tags be applied, barcode stickers be applied, special containers be used, transportation to retailer be paid by the seller, returnable shipping equipment be supplied by the grower, on-time delivery …

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The Effect Of Recreational Fishing On Targeted Fishes And Trophic Structure, In A Coral Reef Marine Park, Mark B. Westera Jan 2003

The Effect Of Recreational Fishing On Targeted Fishes And Trophic Structure, In A Coral Reef Marine Park, Mark B. Westera

Theses: Doctorates and Masters

Recreational line fishing is highly targeted at predatory fishes, making them vulnerable to overfishing. These same fishes play a role in trophic structure by regulating prey species. Despite increasing numbers of fishers, few studies have investigated the potential effects of recreational fishing on fish populations and subsequent trophic effects. This project investigated whether there were differences in fishes and benthos between unfished and recreationally fished areas, and whether the removal of targeted fishes influenced trophic structure. The study was conducted at the Ningaloo Marine Park, Western Australia, which had Sanctuary (no-take) and Recreation {recreationally fished) Zones. Data were collected from …

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Grasshoppers And Mormon Crickets: Fighting Them For Nearly 100 Years, Usu Extension Jan 2003

Grasshoppers And Mormon Crickets: Fighting Them For Nearly 100 Years, Usu Extension

All Current Publications

Grasshoppers are a threat to crops and rangeland across the West, but Utah always has had a special historical relationship with Mormon Crickets. Anabrus simplex has been known as a Mormon Cricket since 1848 when hordes of the insect started eating the early Mormon settlers’ much-needed crops.

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