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2011

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Magnetic Micro-Confinement Of Quantum Degenerate Gases, Ahmed M. Abdelrahman Jan 2011

Magnetic Micro-Confinement Of Quantum Degenerate Gases, Ahmed M. Abdelrahman

Theses: Doctorates and Masters

In this dissertation we explore the basic principles of the magnetic micro-confinement of the quantum degenerate gases where the approach of the so-called two-dimensional magnetic lattices has been theoretically and experimentally investigated. In this research a new generation of two-dimensional magnetic lattice has been proposed and considered as a developing phase for the previous approaches. Its advantage relies on introducing a simplified method to create single or multiple micro-traps of magnetic field local minima distributed, at a certain working distance, above the surface of a thin film of permanent magnetic material. The simplicity in creating the magnetic field local minima …

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Approaches To The Spatial Modelling Of Cancer Incidence And Mortality In Metropolitan Perth, Western Australia, 1990 -2005, Changying Shao Jan 2011

Approaches To The Spatial Modelling Of Cancer Incidence And Mortality In Metropolitan Perth, Western Australia, 1990 -2005, Changying Shao

Theses: Doctorates and Masters

Cancer is one of potentially preventable and treatable diseases. Cancer analysis from different perspectives is necessary to provide the information for health research and the initiation of prevention and treatment programs. The purpose of this study was to analyse five top cancers in the Perth metropolitan area, including lung, melanoma, breast, prostate and colorectal cancers, using two methodologies: Area-to-Point Poisson (ATP) kriging and fitting an inhomogeneous Poisson process model using the Berman-Turner algorithm. ATP Poisson kriging was used to undertake the analysis on the spatial distribution of cancer rates per 100,000 person-years for Perth Statistical Local Areas during the period …

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Re-Presenting Gender Fluid Identity In A Contemporary Arts Practice, Matthew Jackson Jan 2011

Re-Presenting Gender Fluid Identity In A Contemporary Arts Practice, Matthew Jackson

Theses: Doctorates and Masters

This dissertation addresses the paucity of representation of gender fluid identity within contemporary imagery. An examination of historical and socio-political structures inherent in modern Western society serves as a foundational position for a broader exploration of differently gendered communities globally. The case is made for contemporary art to be encouraged as a tool for the emancipation of subjugated gender fluid identities. Examples of contemporary gender fluid visual art and artists are presented to illustrate the ability of art to enable agency within the broader gender fluid community. Finally, a commentary on my own artwork is presented and discussed in relation …

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An Investigation Into The Feasibility Of Using Digital Representations Of Students’ Work For Authentic And Reliable Performance Assessment In Applied Information Technology, David G. Miller Jan 2011

An Investigation Into The Feasibility Of Using Digital Representations Of Students’ Work For Authentic And Reliable Performance Assessment In Applied Information Technology, David G. Miller

Theses: Doctorates and Masters

The assessment of student performance in areas such as drama, physical education, art and Information Technology (IT), does not lend itself to traditional, paper-based testing methods. In these domains, much emphasis is placed on the acquisition and demonstration of practical skills and these may be difficult, if not impossible, to measure by scores on theoretical, written assessments. Alternative forms of assessment, which are both valid and reliable, need to be devised for the practical aspects of these subject areas. The capture, in digital form, of students’ work, may allow the development of authentic forms of summative, high-stakes assessment with high …

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Toward A Better Understanding Of Motivations For A Geotourism Experience: A Self-Determination Theory Perspective, Mamoon Allan Jan 2011

Toward A Better Understanding Of Motivations For A Geotourism Experience: A Self-Determination Theory Perspective, Mamoon Allan

Theses: Doctorates and Masters

Motivation theories and studies play a vital role in understanding why tourists travel and the kind of activities they engage in whilst away from home. By reviewing the literature, it is apparent that previous tourism studies pay scant attention to the issue of why people travel to geosites and this important issue is still an undeveloped area of study. Therefore, investigating the motivations of tourists undertaking a geotourism (geology and tourism) experience reflects an urgent need to bridge the gap in the geotourism literature. The purpose of this study is to explore the different motivations behind tourists engaging in a …

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Philosophy For Teenagers: Finding New Relevence In Old Concepts, Andrea Monteath Jan 2011

Philosophy For Teenagers: Finding New Relevence In Old Concepts, Andrea Monteath

Theses: Doctorates and Masters

In 2008, the Curriculum Council of Western Australia launched a formal curriculum of philosophy and ethics education for upper secondary students. This thesis is a writing project that provides a new teaching text in support of this course. The thesis is composed of two components, a creative project and an essay. The creative project is a work of non-fiction entitled, Philosophy for Teenagers: Finding New Relevance in Old Concepts, and has been researched and designed employing the Western Australian Certificate of Education (WACE) Philosophy and Ethics course model. Philosophy for Teenagers aims to provide an innovative introduction to concepts such …

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An Investigation Into Internetworking Education, Woratat Makasiranondh Jan 2011

An Investigation Into Internetworking Education, Woratat Makasiranondh

Theses: Doctorates and Masters

Computer network technology and the Internet grew rapidly in recent years. Their growth created a large demand from industry for the development of IT and internetworking professionals. These professionals need to be equipped with both technical hands-on skills and non-technical or soft skills. In order to supply new professionals to the industry, educational institutions need to address these skills training in their curricula. Technical hands-on skills in internetworking education can be emphasised through the practical use of equipment in classrooms. The provision of the networking equipment to the internetworking students is a challenge. Particularly, university students in developing countries may …

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Systemic Problems Related To Multiple Stakeholders In Technology Adoption And Use In Organizations : A Systems Thinking Perspective, Syed A. Raza Jan 2011

Systemic Problems Related To Multiple Stakeholders In Technology Adoption And Use In Organizations : A Systems Thinking Perspective, Syed A. Raza

Theses: Doctorates and Masters

Understanding and creating the conditions under which information systems will be embraced by human organizations (thinking systems) remain high-priority research issues. Despite numerous benefits associated with information technology (IT), implementing an information system (IS) in organizational environment is challenging. The literature reports numerous IS project failures. During IS implementation, several factors impede technology’s widespread adoption and use in organizations. These organizational problems often result from such barriers or ‘systemic problems’. The proposed work is based on the argument that addressing ‘systemic problems’ can reduce barriers to organizational progress. Most of the IS/IT adoption theories (e.g. TAM, UTAUT, TAM2 and TAM3) …

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They Reckon I Need A Dramaturg : Examining The Value Of A Dramaturg To Both The Playwright And The Professional Theatre Company In Australia, Polly Low Jan 2011

They Reckon I Need A Dramaturg : Examining The Value Of A Dramaturg To Both The Playwright And The Professional Theatre Company In Australia, Polly Low

Theses: Doctorates and Masters

This thesis examines aspects of dramaturgy delivered by a dramaturg, and the practical contributions of dramaturgs to both the writer and the theatre industry in Australia. It investigates elements of the working relationship between dramaturgs and playwrights, looks at the chameleon-like nature of the theatre dramaturg and examines how Australian writers, directors and dramaturgs perceive the role/s of the dramaturg. The thesis is partly a reflective investigation of personal practice, partly an historical investigation of the emergence of Australian ideas about dramaturgy, and partly an active investigation into what can help to make a constructive playwright/dramaturg relationship. A major aim …

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Determination Of The Effect Of Biodiesel Use On Power Take-Off Performance Characteristics Of An Agricultural Tractor In A Test Laboratory, Ali̇ Aybek, Emrullah Başer, Selçuk Arslan, Mustafa Üçgül Jan 2011

Determination Of The Effect Of Biodiesel Use On Power Take-Off Performance Characteristics Of An Agricultural Tractor In A Test Laboratory, Ali̇ Aybek, Emrullah Başer, Selçuk Arslan, Mustafa Üçgül

Turkish Journal of Agriculture and Forestry

Tractor performance tests conducted under laboratory test conditions are important because these tests determine the performance characteristics used to compare strengths and weaknesses of tractors. The objective of this study was to determine the effect of diesel fuel (B0) and 3 different biodiesel blends made of canola oil (B10, B20, B30) on tractor power take-off (PTO) performance characteristics. Performance characteristics studied were PTO power, engine torque, engine fuel consumption, and specific fuel consumption on an agricultural tractor (Massey Ferguson 3056 2WD) at the test laboratory of the Directorate of Agricultural Machinery Test Center (TAMTEST), Ministry of Agriculture and Rural Affairs, …

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Effects Of Nitrogen And Harvesting Time On Chemical Composition Of Biomass Of Sudan Grass, Fodder Sorghum, And Their Hybrid, Dorde Glamoclija, Snezana Jankovic, Sveto Rakic, Radojka Maletic, Jela Ikanovic, Zeljko Lakic Jan 2011

Effects Of Nitrogen And Harvesting Time On Chemical Composition Of Biomass Of Sudan Grass, Fodder Sorghum, And Their Hybrid, Dorde Glamoclija, Snezana Jankovic, Sveto Rakic, Radojka Maletic, Jela Ikanovic, Zeljko Lakic

Turkish Journal of Agriculture and Forestry

The subject of this study is 2-year variability research (2007 and 2008) of the chemical composition of naturally dried biomass samples of 3 different sorghum species, which are widely used in the southeast Balkans. Samples of Sudan grass Zora, fodder sorghum NS-Dzin, and their hybrid Siloking were examined based on the quantity of used nitrogen and the harvest time. Plants were grown in the experimental field of Radmilovac (property of the Faculty of Agriculture in Belgrade) in a randomized block, split-split plot design with 3 replications for 2 years. Naturally dried biomass with the highest amount of total proteins was …

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The Investigation Of Antimicrobial Activity Of Thyme And Oregano Essential Oils, Bülent Çeti̇n, Songül Çakmakçi, Ramazan Çakmakçi Jan 2011

The Investigation Of Antimicrobial Activity Of Thyme And Oregano Essential Oils, Bülent Çeti̇n, Songül Çakmakçi, Ramazan Çakmakçi

Turkish Journal of Agriculture and Forestry

The aim of this study is to investigate in-vitro antimicrobial effects of the essential oils from oregano (Origanum acutidens and Origanum rotundifolium) and thyme (Thymus sipyleus subsp. sipyleus var. rosulans). The chemical composition and antimicrobial attributes of the essential oils obtained from the aerial parts of the plants, of which there were 3 Lamiaceae species, have been studied. A total of 43 microorganisms, including 26 bacteria, 14 fungi, and 3 yeasts species, have been studied by using disc-diffusion (DD) and minimal inhibition concentration (MIC) methods. Mean inhibition zones and MIC values of bacterial strains varied from 8 and 72 mm …

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Utilization Of Boron Compounds As Synergists With Ammonium Polyphosphate For Flame Retardant Wood-Polymer Composites, Ramazan Kurt, Fati̇h Mengeloğlu Jan 2011

Utilization Of Boron Compounds As Synergists With Ammonium Polyphosphate For Flame Retardant Wood-Polymer Composites, Ramazan Kurt, Fati̇h Mengeloğlu

Turkish Journal of Agriculture and Forestry

The investigation consisted of utilizing boron compounds (BCs) as a synergist with ammonium polyphosphate (APP) in manufacturing flame retardant wood-polymer composites (WPCs). Flame retardants (FRs) at various ratios (APP, boric acid (BA), borax (BX), zinc borate and BA/BX mixtures) were used to determine the physical, mechanical, and burning rate properties of WPCs manufactured from wood flour, polypropylene, and maleic anhydride polypropylene. The results showed that the addition of FRs reduced all mechanical properties of WPCs except for impact strength. However, this reduction was lower for samples having BCs in FRs formulation. Similar burning rate results were achieved in WPCs having …

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Time-Dependent Changes In Distribution Patterns Of Soil Bulk Density And Penetration Resistance In A Rangeland Under Overgrazing, Ekrem Lütfi̇ Aksakal, Taşkin Öztaş, Müdahi̇r Özgül Jan 2011

Time-Dependent Changes In Distribution Patterns Of Soil Bulk Density And Penetration Resistance In A Rangeland Under Overgrazing, Ekrem Lütfi̇ Aksakal, Taşkin Öztaş, Müdahi̇r Özgül

Turkish Journal of Agriculture and Forestry

High soil bulk density and penetration resistance as an indication of soil compaction affect soil infiltration and runoff. Overgrazed rangelands are under severe erosion risk because of soil compaction. The objective of this study was to determine changes in soil bulk density and penetration resistance in a high altitude rangeland within a 3-month grazing period. A 5-ha rangeland (200 × 250 m) was transected with intervals of 25 × 5 m, and soil penetration resistance was measured at 459 points in the 20-cm surface soil layer on 3 different dates (15 July, 15 August, and 15 September). At each intersection …

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Effect Of Mycorrhizal Inoculation On Growth, Nitrogen Fixation, And Nutrient Uptake In Cicer Arietinum (L.) Under Salt Stress, Neera Garg, Shikha Chandel Jan 2011

Effect Of Mycorrhizal Inoculation On Growth, Nitrogen Fixation, And Nutrient Uptake In Cicer Arietinum (L.) Under Salt Stress, Neera Garg, Shikha Chandel

Turkish Journal of Agriculture and Forestry

Most legumes in natural conditions form a symbiosis with arbuscular mycorrhizal (AM) fungi. AM fungi in saline soils have been reported to improve salinity tolerance and growth in plants. In the present study, interaction between mycorrhizal fungus, Glomus mosseae, and salinity stress in relation to plant growth, nitrogen fixation, and nutrient accumulation was evaluated in Cicer arietinum (L.) (chickpea). Two genotypes of chickpea (Pusa-329, salt tolerant, and Pusa-240, salt sensitive) were compared under different levels of salinity with and without mycorrhizal inoculations. Salt stress resulted in a noticeable decline in shoot and root dry matter accumulation, resulting in a decline …

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Cover And Contents Jan 2011

Cover And Contents

Turkish Journal of Agriculture and Forestry

No abstract provided.

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Interactions Between Rural Migration And Land Use Change In The Forest Villages In The Gökçay Watershed, Ceyhun Göl, Sezgi̇n Özden, Hüseyi̇n Yilmaz Jan 2011

Interactions Between Rural Migration And Land Use Change In The Forest Villages In The Gökçay Watershed, Ceyhun Göl, Sezgi̇n Özden, Hüseyi̇n Yilmaz

Turkish Journal of Agriculture and Forestry

This study was carried out to analyze the spatial and temporal pattern of land use/land cover change (from 1955 to 2008) and migration movement (from 1935 to 2007) in the Gökçay River Watershed. To assess this period, the necessary data were obtained from forest stand maps (1955 and 2008) and evaluated by using Geographic Information Systems. Maps of the study area dated 1955 and 2008 have been analyzed, and land use type and change on the land pattern have been investigated. The data reveal that the percentage of forest area, which was 47% in 1955, rose to 50% in 2008; …

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Effect Of Different Irrigation Water Salinities On Some Yield And Quality Components Of Two Field-Grown Cucurbit Species, Li Zong, Anna Tedeschi, Xian Xue, Tao Wang, Massimo Menenti, Cuihua Huang Jan 2011

Effect Of Different Irrigation Water Salinities On Some Yield And Quality Components Of Two Field-Grown Cucurbit Species, Li Zong, Anna Tedeschi, Xian Xue, Tao Wang, Massimo Menenti, Cuihua Huang

Turkish Journal of Agriculture and Forestry

Using irrigation water with a salinity level of 0.8, 2, and 5 g L^{-1}, the impact of saline water irrigation on the yield and quality of 2 Chinese Cucurbit species, melon (Cucumis melo cv. Huanghe) and watermelon (Citrullus lanatus. convar megulaspemus) were studied in Minqin Oasis, northwestern China. Our results show that melon yields decreased as water salinity increased, just as concentrations of glutamic acid content rose, although the concentration of most amino acids did not differ significantly. In contrast, watermelon yields decreased significantly as water salinity rose, and fruit number, fruit firmness, fruit crude protein, and essential amino acid …

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Cover And Contents Jan 2011

Cover And Contents

Turkish Journal of Agriculture and Forestry

No abstract provided.

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Effect Of Mini-Plug Container Depth On Root And Shoot Growth Of Four Forest Tree Species During Early Developmental Stages, Panagiota Kostopoulou, Kalliopi Radoglou, Olympia Dini-Papanastasi, Christina Adamidou Jan 2011

Effect Of Mini-Plug Container Depth On Root And Shoot Growth Of Four Forest Tree Species During Early Developmental Stages, Panagiota Kostopoulou, Kalliopi Radoglou, Olympia Dini-Papanastasi, Christina Adamidou

Turkish Journal of Agriculture and Forestry

The container type used in nursery culture is among the most important determinants of containerised seedling quality. The objective of the present study was to analyse root and shoot growth, root growth potential, and photochemical efficiency of seedlings of Picea abies, Robinia pseudoacacia, Pinus brutia, and Pinus nigra cultivated for 5 weeks in mini-plugs of 2 different cavity depths (37 and 60 mm). The results showed that precultivation of P. nigra and, to a lesser extent, of R. pseudoacacia in deeper mini-plug containers improved seedling morphological attributes and quality, but shallow containers produced better quality seedlings of P. abies. In …

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Isolation And Characterization Of Native Bacillus Thuringiensis Isolates From Syrian Soil And Testing Of Their Insecticidal Activities Against Some Insect Pests, Hassan Ammouneh, Muhand Harba, Emad Idris, Hayat Makee Jan 2011

Isolation And Characterization Of Native Bacillus Thuringiensis Isolates From Syrian Soil And Testing Of Their Insecticidal Activities Against Some Insect Pests, Hassan Ammouneh, Muhand Harba, Emad Idris, Hayat Makee

Turkish Journal of Agriculture and Forestry

Bacillus thuringiensis was detected in 12.5% of soil samples collected from different regions in Syria and 25 B. thuringiensis isolates were found to be highly toxic to larvae of Ephestia kuehniella Zeller, Phthorimaea operculella Zeller, and Cydia pomonella L. (Lepidoptera), but not to the larvae of Culex quinquefasciatus (Diptera). Light microscopy investigation showed the presence of bipyramidal and cuboidal parasporal bodies produced by these isolates. The existence of different cry genes in the tested isolates was studied using a PCR strategy with a set of general primers recognizing some of the cry genes reported in the relevant literature. Primers corresponding …

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Field Evaluation Of Effective Microorganisms (Em) Application For Growth, Nodulation, And Nutrition Of Mung Bean, Arshad Javaid, Rukhsana Bajwa Jan 2011

Field Evaluation Of Effective Microorganisms (Em) Application For Growth, Nodulation, And Nutrition Of Mung Bean, Arshad Javaid, Rukhsana Bajwa

Turkish Journal of Agriculture and Forestry

Effective microorganisms (EM) is a commercial biofertilizer that contains a mixture of co-existing beneficial microorganisms collected from natural environments. Predominantly it consists of species of photosynthetic and lactic acid bacteria, yeast, and actinomycetes. The present study was conducted to evaluate the effect of EM application on growth, nodulation, yield, and nutrient uptake in mung bean [Vigna radiata (L.) Wilczek] var. NIAB Mung 98 under field conditions. Field soil was amended with farmyard manure at 20 t ha^{-1}, Trifolium alexandrinum green manure at 20 t ha^{-1}, and recommended (NPK) and half (½ NPK) doses of chemical fertilizers. EM was applied in …

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Cover And Contents Jan 2011

Cover And Contents

Turkish Journal of Agriculture and Forestry

No abstract provided.

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Global Perspectives On First Generation Liquid Biofuel Production, Rok Fink, Saso Medved Jan 2011

Global Perspectives On First Generation Liquid Biofuel Production, Rok Fink, Saso Medved

Turkish Journal of Agriculture and Forestry

Transport today is mostly sustained by liquid fossil fuels, despite the fact that the invention of the combustion engine started with biofuels. However, known environmental impacts and the instability of the fossil-fuel market have revived the status of biofuels. Some concerns have appeared regarding how emerging global climate changes will affect biofuels' feedstock production, since agriculture is strongly dependent on climate variables. Therefore, numerical models were introduced to calculate how temperature and precipitation could affect crop production for biodiesel and bioethanol production. Furthermore, 4 scenarios projected by the Intergovernmental Panel on Climate Change were put into the calculations. The results …

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Investigation Of The Reduction Of Mouldboard Ploughshare Wear Through Hot Stamping And Hardfacing Processes, Aysel Yazici Jan 2011

Investigation Of The Reduction Of Mouldboard Ploughshare Wear Through Hot Stamping And Hardfacing Processes, Aysel Yazici

Turkish Journal of Agriculture and Forestry

The effects of the hot stamping process and different hardfacing techniques, such as shielded metal arc welding (SMAW) and gas metal arc welding (GMAW), on the abrasive wear of ploughshares were investigated under field operational conditions. The abrasive wear losses were determined by measuring the weight and dimension changes before and after tillage. The wear losses of hot-stamped and hardfaced ploughshares were less significant than those of the conventionally heat-treated ploughshare specimens used under field conditions. Conventional heat treatment and hardfacing by the SMAW process decreased the wear weight losses by 46.31% and the dimensional losses by 86.77% in comparison …

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Estimation Of Single Leaf Chlorophyll Content In Sugar Beet Using Machine Vision, Parviz Ahmadi Moghaddam, Mohammadali Haddad Derafshi, Vine Shirzad Jan 2011

Estimation Of Single Leaf Chlorophyll Content In Sugar Beet Using Machine Vision, Parviz Ahmadi Moghaddam, Mohammadali Haddad Derafshi, Vine Shirzad

Turkish Journal of Agriculture and Forestry

Estimating crop nitrogen status accurately during side-dressing operations is essential for effective management of site-specific nitrogen applications. Variable rate technology (VRT) is one of the major operations in precision agriculture to reduce environmental risks and increase fertilizer use efficiency. In the present study, color image analysis was performed to estimate sugar beet leaf chlorophyll status. The experiment was carried out in a phytotron and nitrogen was applied at 6 levels to the sugar beet grown in pots. Chlorophyll level of the leaves was measured by a SPAD-502 chlorophyll meter. To estimate chlorophyll status, a neural-network model was developed based on …

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Assessment Of Yield And Water Use Efficiency Of Drip-Irrigated Cotton (Gossypium Hirsutum L.) As Affected By Deficit Irrigation, Fuad Hussein, Mussaddak Janat, Abdallah Yakoub Jan 2011

Assessment Of Yield And Water Use Efficiency Of Drip-Irrigated Cotton (Gossypium Hirsutum L.) As Affected By Deficit Irrigation, Fuad Hussein, Mussaddak Janat, Abdallah Yakoub

Turkish Journal of Agriculture and Forestry

A field experiment was conducted for 2 consecutive years to evaluate the response of cotton crop to deficit irrigation under drip irrigation conditions. Water use efficiency (WUE), seed cotton yield, and fiber quality parameters were assessed at various irrigation levels. The experiment was set up to apply water at 4 different application rates: 50%, 65%, 80%, and 100% of the soil water depletion. These were abbreviated as DI50, DI65, DI80, and FI, respectively. The total amounts of irrigation water applied were 408 and 773 mm and the average seed cotton yields were 2909 and 5090 kg ha^{-1} for the DI50 …

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Estimating The Soil Water Retention Curve From Soil Particle Size Distribution Using The Arya And Paris Model For Iranian Soils, Leila Rezaee, Mahmoud Shabanpour, Naser Davatgar Jan 2011

Estimating The Soil Water Retention Curve From Soil Particle Size Distribution Using The Arya And Paris Model For Iranian Soils, Leila Rezaee, Mahmoud Shabanpour, Naser Davatgar

Turkish Journal of Agriculture and Forestry

The direct measurement of the soil water retention curve (SWRC) in a laboratory is time-consuming, difficult, and costly. Thus, many attempts have been made to predict the water retention curve indirectly from the physical and chemical properties of soil. The particle size distribution curve is one of the indirect methods used to predict the water retention curve. The Arya and Paris (AP) model predicts the soil water retention curve from soil particle size distribution (PSD) data. The AP model estimates pore radius from the radius of spherical particles by using a scaling parameter (\alpha). The objective of this study was …

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Cover And Contents Jan 2011

Cover And Contents

Turkish Journal of Agriculture and Forestry

No abstract provided.

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Market Intermediaries And Rural People In Bolivia's Forest Products Sector: Are Trusting Partnerships Possible?, James T. Murphy, Mary Lawhon Jan 2011

Market Intermediaries And Rural People In Bolivia's Forest Products Sector: Are Trusting Partnerships Possible?, James T. Murphy, Mary Lawhon

Geography

Decentralization in access to and control of Bolivia's forest resources, coupled with a rising global demand for tropical hardwoods, raises important questions about whether increased trade and community forest management (CFM) initiatives can enable forms of market integration that have more favourable outcomes for rural communities. This paper assesses the prospects for such a transition through an examination of the relationships linking wood product market intermediaries (brokers and buyers) to rural suppliers and forest communities in Bolivia. The analysis centres on whether trust - conceptualized as a power-laden sociospatial process driven by multiscalar factors - can evolve between buyers and …

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