Log in

Relevant bibliographies by topics / General Agricultural and Biological Sciences / Dissertations / Theses

To see the other types of publications on this topic, follow the link: General Agricultural and Biological Sciences.

Dissertations / Theses on the topic 'General Agricultural and Biological Sciences'

Author: Grafiati

Published: 9 July 2021

Last updated: 26 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'General Agricultural and Biological Sciences.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Robinson, K. A. "Use of floral resources by the lacewing Micromus tasmaniae and its parasitoid Anacharis zealandica, and the consequences for biological control by M. tasmaniae." Diss., Lincoln University, 2009. http://hdl.handle.net/10182/823.

Full text

Abstract:

Arthropod species that have the potential to damage crops are food resources for communities of predators and parasitoids. From an agronomic perspective these species are pests and biocontrol agents respectively, and the relationships between them can be important determinants of crop yield and quality. The impact of biocontrol agents on pest populations may depend on the availability of other food resources in the agroecosystem. A scarcity of such resources may limit biological control and altering agroecosystem management to alleviate this limitation could contribute to pest management. This

APA, Harvard, Vancouver, ISO, and other styles

2

Rowe, Suzanne J. "QTL mapping technology using variance components in general pedigrees applied to the poultry industry." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/3135.

Full text

Abstract:

The subject area for this thesis is detection of chromosomal regions or QTL causing complex variation at the phenotypic level. In particular, the differentiation of sources of additive and non additive variation. Unlike QTL mapping using divergent or inbred lines, this study aims to explore methods within populations, facilitating direct application of techniques such as marker assisted selection. Specifically, objectives were to evaluate a linear model or variance components (VC) approach to explore the existence and magnitude of variation caused by additive, dominant and imprinted QTL segreg

APA, Harvard, Vancouver, ISO, and other styles

3

Carlin, Graham Richard. "The fabrication of biodegradable nanospheres from novel hydroxyalkanoates for the delivery of actives of pharmaceutical and agricultural interest." Thesis, Aston University, 2001. http://publications.aston.ac.uk/11010/.

Full text

Abstract:

This work describes the fabrication of nanospheres from a range of novel polyhydroxyalkanoates supplied by Monsanto, St Louis, Missouri, USA for the delivery of selected actives of both pharmaceutical and agricultural interest. Initial evaluation of established microsphere and nanosphere fabrication techniques resulted in the adoption and optimisation of a double sonication solvent evaporation method involving the synperonic surfactant F68. Nanospheres could be consistently generated with this method. Studies on the incorporation and release of the surrogate protein Bovine Serum Albumin V demo

APA, Harvard, Vancouver, ISO, and other styles

4

Lahai, Bernadette A. N. "Effectiveness of agricultural extension agents in reaching farmers with extension services in Oyo, Kaduna and Rivers State Agricultural Development Projects in Nigeria." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242339.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Chennells, Roger Scarlin. "Equitable access to human biological resources in developing countries : benefit sharing without undue inducement." Thesis, University of Central Lancashire, 2014. http://clok.uclan.ac.uk/10634/.

Full text

Abstract:

The main research question of this thesis is: How can cross-border access to human genetic resources, such as blood or DNA samples, be governed to achieve equity for developing countries? Access to and benefit sharing for human biological resources is not regulated through an international legal framework such as the Convention on Biological Diversity, which applies only to plants, animals and micro-organisms as well as associated traditional knowledge. This legal vacuum for the governance of human genetic resources can be attributed (in part) to the concern that benefit sharing might provide

APA, Harvard, Vancouver, ISO, and other styles

6

Figueroa, Luis. "Geography, linkages and capabilities : innovation in the agricultural coffee production in Latin America." Thesis, University of Essex, 2015. http://repository.essex.ac.uk/15579/.

Full text

Abstract:

The main contribution of this work is the proposal of a conceptual framework that integrates internal (to the firm) conditions with external influences at two geographical proximity levels, local and non-local, with respect to four types of innovation performance: product innovation, process innovation, managerial/organisational innovation and marketing innovation. This is quantitatively evaluated in a sample of 186 coffee farmers from Latin America. Following the Resource-Based View of the Firm (RBV), the internal conditions include two firm capabilities: technological capabilities and market

APA, Harvard, Vancouver, ISO, and other styles

7

Macedo, Manoel Moacir Costa. "The process of agricultural technology generation in Brazil : a social audit." Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361358.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Uwannah, Chukwuemeka Emmanuel. "Communication linkage patterns in the agricultural research and extension systems in Nigeria." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298664.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Barnes, Andrew. "Questioning the role of the public sector in UK agricultural R and D." Thesis, University of Glasgow, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366196.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Wahlbäck, Kalle. "General factors that regulate survival among ectotherms at northern latitudes: a study of sand lizard, Lacerta agilis, habitat in southern Sweden." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-40700.

Full text

Abstract:

Open sand habitats in Sweden has been declining for the past century and this is mirrored by the increasing fragmentation and attenuation of species bound to these habitats. Many threatened species coexist in the same habitats as sand lizards, habitats best described as warm sites with a long continuity. Often with a sand-based substrate and a mosaic landscape of heather Calluna vulgaris, herbs, and patches of grass. Generally, areas with open sand are one of the keys for species bound to these habitats considering many of the species use south-facing sand slopes as nesting sites since it hold

APA, Harvard, Vancouver, ISO, and other styles

11

Duffy, Margaret R. "Determining the biological turnover rate of phosphate in agricultural soils using stable oxygen isotopes." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1593864445251739.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Thompson, Iris Lee. "Agricultural Systems in Babati : Zea mays and its alternatives." Thesis, Södertörn University College, School of Life Sciences, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-2660.

Full text

Abstract:

<p>This paper aims to give an understanding on the aspects that influences the choice of cropsand agricultural methods in Babati, Tanzania. Drought is a reoccurring problem in this part ofTanzania, which affects a majority of the towns’ farmers. This fact is likely to affect thechoice of crop as well as the limitations when it comes to the choices in cultivation. But thechoice itself has implications on its surrounding and can be affected by the surrounding. Tounderstand the circumstances, a wider picture will be depicted and an evaluation of thegeography of Babati and on its climate condition

APA, Harvard, Vancouver, ISO, and other styles

13

Fairooz, Khalid Moinuddin. "Agricultural policy in the UAE : the views and opinions of policy maker, executives and farmers." Thesis, University of Exeter, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263203.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Ramsey, Nicole B. "Bilayer perturbation is a distinct parameter for regulating the experimental use of biological probes and the development of antimalarials." Thesis, Weill Medical College of Cornell University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3580196.

Full text

Abstract:

<p> The controlled production and degradation of cAMP allows for control of many different signaling pathways. cAMP is produced by genetically distinct transmembrane (tmAC) and soluble (sAC) adenylyl cyclases; cAMP is catabolized by phosphodiesterases (PDEs). The relative contributions of sAC and tmAC to cAMP production, and of the PDEs to cAMP catabolism, usually are explored using pharmacological interventions. Because the compounds used to manipulate intracellular cAMP levels must cross cell membranes, they need to partition into lipid bilayers, which raises the question whether they could

APA, Harvard, Vancouver, ISO, and other styles

15

Kim, Grace. "Development of a nutrition-based curriculum for farm-to-school programs for the fourth and fifth grades." Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1527328.

Full text

Abstract:

<p> The purpose of this project was to develop a garden-enhanced nutrition curriculum for educators of students in the fourth and fifth grades. The goals of this curriculum were to provide literature related to farm-to-school initiatives, to increase educators’ and students’ knowledge about farm-to-school programs through an evidence-based nutrition education curriculum, and to increase fruit and vegetable consumption among the students. </p><p> The curriculum, Let’s Grow!, was created addressing perceived barriers that prevent the implementation of school gardens that may

APA, Harvard, Vancouver, ISO, and other styles

16

Costa, Leonardo. "Control of water use in northwest Portugal." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/289751.

Full text

Abstract:

Over the past 20 years, growing water demand in Spain has greatly reduced river flows into Portugal. Increasing pressures are expected on northern regions of Portugal, such as the Entre Douro e Minho (EDM), to reduce water use and improve quality. Two models, one theoretical and the other empirical, are developed to analyze water use by EDM agriculture. The theoretical model considers firms consuming and polluting water with multiple inputs, outputs, emissions, interdependent externalities, and transaction costs. The empirical model considers a flexible quadratic restricted profit model of rep

APA, Harvard, Vancouver, ISO, and other styles

17

Coronado, López Fredy Samuel. "General diagnosis of Salitrón, a village in San Juan Ermita, department of Chiquimula." BYU ScholarsArchive, 1995. https://scholarsarchive.byu.edu/etd/5352.

Full text

Abstract:

This study reports on the development of a diagnostic tool to assess the current socio-economic and cultural conditions as well as physical and natural resources among the rural communities of Salitrón and San Juan Ermita, Chiquimula, Guatemala. This diagnostic tool revealed the current situation in these communities, especially in the population dedicated to agricultural production. Several alternative recommendations are provided to improve development projects in these communities. This project was made possible through the participation of CUNORI (Centro Universitario de Oriente) agricultu

APA, Harvard, Vancouver, ISO, and other styles

18

Filling, Julia. "Human Urine : can it be applied as fertilizer in agricultural systems?" Thesis, Högskolan Kristianstad, Fakulteten för naturvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-18029.

Full text

Abstract:

In cities today, vast amounts of nutrients are being wasted. Improvement in nutrient management within agriculture can contribute to a more sustainable society. Reusing nutrients in agriculture could aid in creating a more circular system, where organic fertilizers can be used instead of chemical fertilizers. Urine is a liquid which has a high nutrient content. According to the Swedish environmental protection agency, human urine can replace mineral fertilizers, by using methods such as source separation, where urine is divided from faeces. This is a cheap, effective and sustainable fertilizer

APA, Harvard, Vancouver, ISO, and other styles

19

Muhammad, Sher. "An effective communication model for the acceptance of new agricultural technology by farmers in the Punjab, Pakistan." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384914.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Callaghan, Fergal James. "Co-digestion of agricultural and industrial wastes." Thesis, University of Birmingham, 1998. http://etheses.bham.ac.uk//id/eprint/3601/.

Full text

Abstract:

Anaerobic digestion technology has not gained widespread acceptance on UK farms due mainly to the long return on investment periods involved. It has been suggested that co-digestion of agricultural and industrial wastes may enhance the economic viability of such installations. Batch and continuous digestion of cattle slurry and organic industrial wastes was carried out in specially constructed pilot plant digesters, to determine optimum mixtures of waste and digester loading rates. A total of 10 different wastes were tested, on a batch digestion basis, for their potential to co-digest with cat

APA, Harvard, Vancouver, ISO, and other styles

21

Touboulic, Anne. "Exploring how to manage supply chain relationships for sustainability : an action research project with PepsiCo and their agricultural suppliers in the UK." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/65479/.

Full text

Abstract:

This thesis is the result of the work conducted in collaboration with PepsiCo UK and their UK based growers between October 2010 and October 2013. The research project has been funded by an ESRC-CASE studentship and has provided the opportunity to explore the relationships between PepsiCo, as a large customer, and their small agricultural suppliers on their journey to address the sustainability challenge. The research is framed within the field of sustainable supply chain management (SSCM), which can be defined as the integration and coordination of economic, environmental and social goals in

APA, Harvard, Vancouver, ISO, and other styles

22

Ham, Brian. "Using Conservative and Biological Tracers to Better Understand the Transport of Agricultural Contaminants from Soil Water through the Epikarstic Zone." TopSCHOLAR®, 2009. http://digitalcommons.wku.edu/theses/133.

Full text

Abstract:

Agriculture contamination is very common in karst systems due to the vulnerability of these aquifers. Animal waste is often spread across crop land to enrich the soil with nitrates and phosphates. Herbicides and pesticides are also applied to the crops. The transport of these pollutants through the soil and epikarst is a difficult process to monitor due to the complex, heterogeneous behavior of the groundwater as it makes its way down to the aquifer below. An experimental site at Crumps Cave lended a unique opportunity to monitor the vadose zone at a waterfall in the cave below. A previous

APA, Harvard, Vancouver, ISO, and other styles

23

Anderson, Bruce Edward, and Bruce Edward Anderson. "Forensic anthropology as science: Is there a difference between academic and applied uses of biological anthropology?" Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282649.

Full text

Abstract:

The central issued explored by this research is whether forensic anthropology can be characterized as being fundamentally different from academically-oriented biological anthropology. My view--and thesis statement--is that they are not two fundamentally-differing pursuits. While I recognize that important differences do exist between these fields, I argue that the differences are not sufficient to draw a stark line between academically-oriented biological anthropology and its medico-legal application. The principal source of data marshaled in support of this view is my dozen-plus years experie

APA, Harvard, Vancouver, ISO, and other styles

24

Ingram, Julie Anne. "Agricultural advisers and the transition to sustainable soil management in England : an analysis of the role of knowledge and knowledge processes." Thesis, University of Gloucestershire, 2004. http://eprints.glos.ac.uk/2071/.

Full text

Abstract:

This research is concerned with the dynamic relationship between agricultural advisers, knowledge and soil in England. On the basis that agricultural advisers have always played a central role in linking research and farming practice and implementing policy on the farm, the thesis explores the role of the adviser in facilitating a shift towards sustainable soil management (which encompasses a range of complex and knowledge intensive practices) and to the realisation of policy objectives in this domain. Specifically it aims to provide detailed empirical evidence of the role that agricultural ad

APA, Harvard, Vancouver, ISO, and other styles

25

Honaman, Andrew M. 1958. "The potential and actual evapotranspiration of water-rich ecosystems in arid regions." Thesis, The University of Arizona, 1998. http://hdl.handle.net/10150/291843.

Full text

Abstract:

The well-known and widely accepted Penman combination equation was applied to climatic data collected in a desert environment to predict actual evapotranspiration if the desert region were developed into irrigated agriculture. The Penman evaporation estimates from desert climate data were compared to Bowen ratio ET measurements collected on irrigated alfalfa fields in the general vicinity. Six variations of the wind function in Penman's equation were tested. From these six the best fit-model was determined. surprisingly, Penman's original equation provided the best fit (in mean hourly units W

APA, Harvard, Vancouver, ISO, and other styles

26

Birgand, François. "Quantification and Modeling of In-Stream Processes in Agricultural canals of the lower coastal plain." NCSU, 2000. http://www.lib.ncsu.edu/theses/available/etd-20000807-154716.

Full text

Abstract:

<p>BIRGAND, FRANÇOIS. Quantification and Modeling of In-Stream Processes in Agricultural Canals of the Lower Coastal Plain. (Under the direction of Dr. R. Wayne Skaggs).Excess nutrient loads have been recognized to be the major cause of serious water quality problems recently encountered in the North Carolina estuaries and coastal waters. There has been a particular concern in coastal watersheds because agricultural and forested lands are located in close proximity to recreational and environmentally sensitive waters. The key to nutrient management at the watershed scale is the understanding a

APA, Harvard, Vancouver, ISO, and other styles

27

Law, Audrey. "EVALUATING THE EFFECTS OF ORGANIC AND CONVENTIONAL INPUTS ON SOIL CHEMICAL AND BIOLOGICAL PROPERTIES IN A FOUR-YEAR VEGETABLE ROTATION AND THE INVESTIGATION OF SOIL MICROBIAL PROPERTIES ON PLANT GENE EXPRESSION." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_diss/704.

Full text

Abstract:

The objective of this research was to determine the effects of conventional inputs on soil chemical and biological properties compared to organic systems in a four year vegetable rotation. Tillage and cover crops were the same in all treatments to avoid confounding factors often present in similar research. Additional experiments investigated plant gene expression in organic and conventional management systems and in soils with decreased microbial diversity. Experimental plots were prepared in the spring of 2004; four replications of three management treatments, organic, low-input and conventi

APA, Harvard, Vancouver, ISO, and other styles

28

Curram, Stephen Paul. "Representing intelligent decision making in discrete event simulation : a stochastic neural network approach." Thesis, University of Warwick, 1997. http://wrap.warwick.ac.uk/59461/.

Full text

Abstract:

The problem of representing decision making behaviour in discrete event simulation was investigated. Of particular interest was modelling variety in the decisions, where different people might make different decisions even where the same circumstances hold. An initial investigation of existing and alternative approaches for representing decision making was carried out. This led to the suggestion of using a neural network to represent the decision making behaviour in the form of a multi-criteria probability distribution based on data of observed decision making. The feasibility of the stochasti

APA, Harvard, Vancouver, ISO, and other styles

29

Mousset, Emmanuel, and Emmanuel Mousset. "Integrated processes for removal of persistent organic pollutants : soil washing and electrochemical advanced oxidation processes combined to a possible biological post-treatment." Phd thesis, Université Paris-Est, 2013. http://tel.archives-ouvertes.fr/tel-00976552.

Full text

Abstract:

Soils contaminated by hydrophobic organic pollutants like polycyclic aromatic hydrocarbons (PAHs) are a common concern since they are extremely difficult to remove and their potential toxicological impacts are significant. As an alternative to traditional thermal or physical treatments, soil washing and soil flushing processes appear to be conceivable and efficient approaches, especially for higher level of pollution. However, the treatment of highly loaded soil washing/flushing solutions is another challenge to overcome. In that way, a new integrated approach is suggested: soil washing/flushi

APA, Harvard, Vancouver, ISO, and other styles

30

Michua, Cedillo Jeny. "Efecto de Beauveria bassiana y Metarhizium anisopliae como biocontroladores del barrenador de las ramas del aguacatero (Copturus aguacatae Kissinger)." Tesis de Licenciatura, Universidad Autónoma del Estado de México, 2011. http://hdl.handle.net/20.500.11799/65295.

Full text

Abstract:

El umbral económico de Copturus aguacatae Kissinger no esta adecuadamente determinado para el estado de México. Para determinar el grado de infestación de dicha plaga, a partir del mes de febrero de 2010 se realizaron 16 muestreos en una huerta de aguacate 'Hass' en la localidad de San Sebastián, municipio de Malinalco. Además se buscó observar la eficiencia de los hongos entomopatógenos Metarhizium anisopliae y Beauveria bassiana como biocontroladores del insecto en estudio. Se determinó el número de instares de los que consta el ciclo biológico del insecto y la duración de cada uno de estos.

APA, Harvard, Vancouver, ISO, and other styles

31

Eastham, Jane Francesca. "An analysis of the success of UK agricultural marketing cooperatives : can they effectively redress power imbalances in current market conditions?" Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/4917/.

Full text

Abstract:

This is exploratory research that has examined the efficacy of agricultural marketing cooperatives in the UK as a mechanism to redress power imbalances when faced with highly consolidated downstream markets. This issue would appear to be of particular significance in the light of the continued UK government emphasis on the cooperative action as a means of supporting farm gate prices following the deregulation of European Markets. This research draws upon, and examines the possible linkages between two key bodies of literature, Power Dependency Theory and literature based on the issue of common

APA, Harvard, Vancouver, ISO, and other styles

32

Ayalp, Ekrem. "Restructuring Agriculture And Adaptive Processes In Rural Areas: The Case Of Cotton Sector In Adana-karatas." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12609010/index.pdf.

Full text

Abstract:

While there has been an ongoing transformation of traditional agriculture and new regulations on agricultural institutional formations and market structures, the aim of this thesis is tracing forward to identify who the losers and the winners of this process would be. The background question is about the new faces of the rural areas and, the study considers what the current importance of agriculture in those areas is and if rural areas as living formations are in transition, then what will be the implications of this restructuring in terms of agriculture. These issues are investigated with ref

APA, Harvard, Vancouver, ISO, and other styles

33

Yasar, Suna Senem. "Knowledge Networks And Cognitive Communities In Clusters: The Case Of Ict Cluster Of Metu Technopolis And Agricultural Tools And Machinery Cluster Of Konya." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612621/index.pdf.

Full text

Abstract:

Knowledge is defined one of the fundamental resources for development, competitiveness and power of firms, industrial clusters and regions. Their competitiveness and development have a strong relationship with their ability to create, absorb and utilize knowledge and to learn, i.e. their cognitive capabilities. This thesis is focused on clusters as cognitive and learning systems. Clusters are the agglomerations where collective learning may take place. New knowledge is created and shared within the clusters&#039<br>knowledge networks. Knowledge networks and cognitive communities as a part of t

APA, Harvard, Vancouver, ISO, and other styles

34

Dibenedetto, Silvia. "Direct activation of endogenous Calcineurin A : biological impact of selective peptide aptamers." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2011. http://tel.archives-ouvertes.fr/tel-00757018.

Full text

Abstract:

Therapeutic approaches leading to the stimulation of regeneration, and/or inhibition of degeneration processes in neuromuscular disorders are believed to offer valid therapeutic strategies that would preserve muscle tone and contribute to the quality of life while lengthening patient life span. Activation of CalcineurinA (CnA), a threonine-serine phosphatase, controls gene regulatory programs in skeletal muscle by stimulating slow muscle fiber (type I) gene expression. This phosphatase has been also identified as a key mediator in the hypertrophic response and in skeletal muscle regeneration.

APA, Harvard, Vancouver, ISO, and other styles

35

Scurich, Justin J. "STRAWBERRY GROWTH, YIELD, FRUIT NUTRITION, AND CONTROL OF VERTICILLIUM WILT WITH PRE-PLANT SOIL FUMIGANTS, OZONE, AND BIOLOGICAL CONTROL." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/714.

Full text

Abstract:

Verticillium wilt is a widespread soilborne disease of strawberry historically controlled by soil fumigation with methyl bromide (MB). MB was banned by the United Nations in 1995 and will be completely phased out by 2015. Research has concentrated on alternative methods of disease control without finding a single alternative able to replace MB in widespread disease control and yield increase. For the current study, strawberries were greenhouse grown in container pots filled with soil from both infested and non-infested areas of a commercial strawberry field in Watsonville, CA. Treatments i

APA, Harvard, Vancouver, ISO, and other styles

36

Lloyd, Davidson A. "The effect of forest to pasture conversion on soil biological diversity and function." Diss., Lincoln University, 2008. http://hdl.handle.net/10182/711.

Full text

Abstract:

Recent declines in returns from primary forest products in New Zealand and projected increases in world food prices have led to the land-use conversion from plantation forest to pastoral farming in many lowland areas. After decades of forest cover the soils are in many cases less than adequate for pastoral farming, as they are acidic, with toxic levels of exchangeable aluminum, and contain low levels of available nitrogen (N), very high carbon (C):N ratio, and are devoid of earthworms and structural integrity. Overcoming the major site limitations of low soil pH and available N was a major pri

APA, Harvard, Vancouver, ISO, and other styles

37

Kucuk, Gamze. "The Evolution Of Intra And Extra Eu-15 Agricultural Trade: The Impact Of The Cap Reform And The Uraa." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609959/index.pdf.

Full text

Abstract:

In this thesis, intra and extra European Union-15 agricultural trade is investigated for the period 1985 - 2005. The main purpose of this study is to find out to what extent the two major events of this period, the CAP reform of mid-1990&rsquo<br>s and the Uruguay Round Agreement on Agriculture (URAA) of 1995, changed the relative shares of extra and intra trade in overall agricultural trade. The efforts to make European agriculture more competitive and more integrated with the world market have not concluded in a way that the dominance of intra trade over extra trade is relieved. The intra tr

APA, Harvard, Vancouver, ISO, and other styles

38

Orre, G. U. S. "'Attract and reward' : combining a floral resource subsidy with a herbivore-induced plant volatile to enhance conservation biological control." Diss., Lincoln University, 2009. http://hdl.handle.net/10182/1429.

Full text

Abstract:

Experiments were conducted to assess whether a concept termed 'attract and reward' (A&R) could enhance conservation biological control (CBC). In A&R, a synthetically-produced herbivore induced plant volatile (HIPV) ('attract') is combined with a floral resource ('reward'). It is anticipated that the two will work synergistically attracting natural enemies into the crop ('attract') and maintaining them within the crop ('reward'). The study system consists of brassica, the most commonly occurring brassica herbivores, their natural enemies and higher order natural enemies. The HIPV deployed is me

APA, Harvard, Vancouver, ISO, and other styles

39

Stephens, Daren. "Hedonic bull pricing models: estimating the value of traits of bulls sold following performance testing." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/20575.

Full text

Abstract:

Master of Agribusiness<br>Department of Agricultural Economics<br>Ted Schroeder<br>Selection of a herd sire has always been of paramount importance given the initial financial investment and their contribution and effect on the genetic make-up of a beef herd. Data was collected from the nation’s longest consecutively run bull test conducted at the University Farm of Oklahoma Panhandle State University (OPSU). The Bull Test and Bull Sale data utilized were collected from 2008-2013. Performance data was collected over a 112 day test period with data collection occurring at 28 day intervals.

APA, Harvard, Vancouver, ISO, and other styles

40

Aravena, Duarte Andrés Octavio. "Probabilistic and constraint based modelling to determine regulation events from heterogeneous biological data." Phd thesis, Université Rennes 1, 2013. http://tel.archives-ouvertes.fr/tel-00988255.

Full text

Abstract:

This thesis proposes a method to build realistic causal regulatory networks hat has lower false positive rate than traditional methods. The first contribution of this thesis is to integrate heterogeneous information from two types of network predictions to determine a causal explanation of the observed gene co-expression. The second contribution is to model this integration as a combinatorial optimization problem. We demonstrate that this problem belongs to the NP-hard complexity class. The third contribution is the proposition of a heuristic approach to have an approximate solution in a pract

APA, Harvard, Vancouver, ISO, and other styles

41

Stark, Christine H. "Effects of long- and short-term crop management on soil biological properties and nitrogen dynamics." Lincoln University, 2005. http://hdl.handle.net/10182/30.

Full text

Abstract:

To date, there has been little research into the role of microbial community structure in the functioning of the soil ecosystem and on the links between microbial biomass size, microbial activity and key soil processes that drive nutrient availability. The maintenance of structural and functional diversity of the soil microbial community is essential to ensure the sustainability of agricultural production systems. Soils of the same type with similar fertility that had been under long-term organic and conventional crop management in Canterbury, New Zealand, were selected to investigate relation

APA, Harvard, Vancouver, ISO, and other styles

42

Laubertie, Elsa. "The role of resource subsidies in enhancing biological control of aphids by hoverflies (Diptera: Syrphidae)." Diss., Lincoln University, 2007. http://hdl.handle.net/10182/984.

Full text

Abstract:

In this thesis, experiments were conducted in the laboratory and the field to determine whether the provision of floral resources to hoverflies could enhance the biological control of aphids. The overall aim was to clarify hoverfly behaviour and ecology in an agroecosystem in order to understand the potential of these insects for biocontrol under a conservation biological control (CBC) regime. A preliminary experiment in New Zealand compared the effect of different coloured water-traps on catches of the hoverflies Melanostoma fasciatum (Macquart) and Melangyna novaezelandiae (Macquart). Signif

APA, Harvard, Vancouver, ISO, and other styles

43

Bloomberg, Mark. "Modelling germination and early seedling growth of radiata pine." Lincoln University, 2008. http://hdl.handle.net/10182/681.

Full text

Abstract:

Background: This study seeks to model aspects of the regeneration of radiata pine (Pinus radiata D.Don) seedlings under a range of environmental conditions. This study investigated whether “hybrid” mechanistic models, which predict plant growth and development using empirical representations of plant physiological responses to the environment, could provide a realistic alternative to conventional empirical regeneration models. Objectives: The objectives of this study were to 1) identify the functional relationships between the environmental conditions controlling germination, establishmen

APA, Harvard, Vancouver, ISO, and other styles

44

Murray, Tara J. "Effect of physiological and behavioural characteristics of parasitoids on host specificity testing outcomes and the biological control of Paropsis charybdis." Lincoln University, 2010. http://hdl.handle.net/10182/1558.

Full text

Abstract:

An established host-parasitoid-hyperparasitoid system was used to investigate how the physiological and behavioural characteristics of parasitoids influence the outcomes of laboratory-based host specificity tests. The characteristics of the two pteromalid egg parasitoids, Enoggera nassaui (Girault) and Neopolycystus insectifurax Girault, were assessed and interpreted in regard to the particular host specificity testing methods used and the control of the eucalypt defoliating beetle Paropsis charybdis Stål (Chrysomelidae) in New Zealand. The physiology of N. insectifurax was examined to determ

APA, Harvard, Vancouver, ISO, and other styles

45

Curran, Kassie. "Consumer acceptance of omega-3 enhanced beef in surveys and retail trials." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/20413.

Full text

Abstract:

Master of Science<br>Agricultural Economics<br>John A. Fox<br>This study examines consumer acceptance of omega-3 enhanced beef using data from a choice experiment and a retail trial. The retail trial was conducted in collaboration with La Vaca Meat Company, Littleton, CO which offered omega-3 enhanced beef products for sale both online and in-store. Prices were adjusted periodically, and online customers were surveyed to gather information about their purchase decisions. The choice experiment was included in an online survey conducted with a nationally representative sample of consumers. One

APA, Harvard, Vancouver, ISO, and other styles

46

Fisher, P. M. "Residual concentrations and persistence of the anticoagulant rodenticides brodifacoum and diphacinone in fauna." Lincoln University, 2009. http://hdl.handle.net/10182/930.

Full text

Abstract:

Brodifacoum is a highly effective anticoagulant rodenticide that presents a secondary hazard to some non-target wildlife. The high acute toxicity of brodifacoum to mammals and birds, and its prolonged persistence in liver predicates secondary risk to predators and scavengers of poisoned rodents. Hence there is a need to improve ability to monitor and predict hazards of brodifacoum to non-targets, and optimise use patterns accordingly. Use of a less persistent anticoagulant rodenticide, diphacinone, is an alternative approach currently under investigation in New Zealand. This thesis describes a

APA, Harvard, Vancouver, ISO, and other styles

47

Kancharla, Jahnavi Reddy. "Generation of Transgenic Medicago Sativa Overexpressing "Osmotin-Chitinase" Gene Chimera." TopSCHOLAR®, 2011. http://digitalcommons.wku.edu/theses/246.

Full text

Abstract:

Medicago is widely used as a forage crop. It is often susceptible to various pathogenic infections and exhibits low growth in drought and extreme climatic conditions. In the current study, a strategy was developed for over-expressing an “Osmotin-Chitinase” gene chimera in transgenic Medicago that could potentially confer resistance to different biotic and abiotic stresses. Seed germination of several cultivars of Medicago (M. sativa ssp. sativa, M. sativa ssp. falcata, M. sativa ssp. caerulea, M. truncatula, and M. Rugosa) was tested to determine the cultivars with good germination rates. Amon

APA, Harvard, Vancouver, ISO, and other styles

48

Abro, Manzoor Ali. "Nitrogen fertilization of the host plant influences susceptibility, production and aggressiveness of Botrytis cinerea secondary inoculum and on the efficacy of biological control." Phd thesis, Université d'Avignon, 2013. http://tel.archives-ouvertes.fr/tel-00985012.

Full text

Abstract:

Nitrogen (N) fertilization is known to influence the susceptibility of many plants to a variety of diseases. In the case of diseases caused by Botrytis cinerea, the role of N fertilization appears to be variable, with high levels either fostering or reducing severity depending on the studies. To test whether this variability could be due to possible differences in the host plants, inoculum pressure or in the behavior of different strains of the pathogen, studies were carried out to investigate the effect of different N fertilization regimes on the susceptibility of tomato and lettuce to six is

APA, Harvard, Vancouver, ISO, and other styles

49

Yamoah, Emmanuel. "A model system using insects to vector Fusarium tumidum for biological control of gorse (Ulex europaeus)." Phd thesis, Lincoln University. Bio-Protection and Ecology Division, 2007. http://theses.lincoln.ac.nz/public/adt-NZLIU20080131.114607/.

Full text

Abstract:

The overall objective of this study was to test the hypothesis that insects can vector F. tumidum conidia to infect gorse plants with the aim of developing an alternative approach to mycoherbicide delivery to control weeds. Four potential insect species (Apion ulicis, Cydia ulicetana, Epiphyas postvittana and Sericothrips staphylinus) were assessed for their ability to vector F. tumidum conidia. To achieve this, the external microflora (bacteria and fungi) and the size and location of fungal spores on the cuticle of these insect species were determined. In addition, the ability of the insects

APA, Harvard, Vancouver, ISO, and other styles

50

Kean, J. M. "Metapopulation theory in practice." Lincoln University, 1999. http://hdl.handle.net/10182/1372.

Full text

Abstract:

A metapopulation is defined as a set of potential local populations among which dispersal may occur. Metapopulation theory has grown rapidly in recent years, but much has focused on the mathematical properties of metapopulations rather than their relevance to real systems. Indeed, barring some notable exceptions, metapopulation theory remains largely untested in the field. This thesis investigates the importance of metapopulation structure in the ‘real world’, firstly by building additional realism into metapopulation models, and secondly through a 3-year field study of a real metapopulation s

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!