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Dissertations / Theses on the topic 'White clover'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Youlin, Tang M. S. "Response of Leaf Protein to Ozone in Two White Clover Clones." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/46494.

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A white clover ( Trifolium repens ) system, based on one ozone-sensitive (NC-S) and one ozone-resistant (NC-R) clone, has been developed as an indicator to estimate the effects of tropospheric ozone on plant biomass production. A reduction in the vegetative biomass ratio (NC-S/NC-R) of the clones was correlated with increasing concentrations of ozone during a 28-day exposure period. However, the mechanism of ozone sensitivity or tolerance at the biochemical or molecular level is not known. Superoxide dismutase isozyme activities in the two clones did not respond differently to ozone treatment.

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2

Kuschel, Nolberto German Teuber. "Investigation of physiological factors determining white clover persistence in grass/clover swards." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333854.

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3

Sparks, Bret Andrew. "Reduced Inputs Turfgrass Through White Clover Inclusion." UKnowledge, 2014. http://uknowledge.uky.edu/pss_etds/41.

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Most managed turfgrass species require frequent inputs to maintain an acceptable level of quality. Among these inputs, nitrogen (N) fertilization is usually the most limiting in terms of growth and development. However, N fertilization is also linked to non-point source (NPS) pollution. White clover (WC) is known for its ability to provide N when mixed into stands of turfgrass, and does not pose a threat for NPS pollution. Two field studies were designed to investigate the effects of WC inclusion in stands of cool-season turfgrasses. In the first field study, three cultivation techniques were

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4

Baines, R. N. "Interactions between white clover and pasture grasses." Thesis, University of Reading, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383598.

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5

Berrington, A. C. "Co-evolution of white clover to associated mycorrhizae." Thesis, Bangor University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381917.

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6

Clark, Sonya A. "Herbicide effects on white clover growth and nodulation." Thesis, University of Canterbury. Microbiology, 1987. http://hdl.handle.net/10092/6909.

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Five herbicides commonly used for suppression of weed growth in white clover seed crops were tested for toxicity against white clover (Trifolium repens), Rhizobium trifolii and the nitrogen fixing symbiosis formed between these two organisms. Trials were carried out on R.trifolii on solid and in liquid media to determine if growth of this bacterium was affected by the presence of the 5 herbicides. Paraquat and MCPB substantially inhibited bacterial growth on solid medium. Bentazone, fusilade and kerb caused very small zones of growth inhibition of R.trifolii on solid agar at high concentration

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7

Enríquez, Hidalgo Daniel. "Strategies to optimise white clover (Trifolium repens L.) content in grass white clover swards to consistently replace inorganic nitrogen in grazing systems." Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.673846.

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Mixed perennial ryegrass white clover (WC) swards (GWc) provide a sustainable nitrogen source for grazing systems and improve herbage quality, but sward WC content and nitrogen fixation can be suppressed by fertiliser nitrogen application. Differences in structural characteristics between the species can affect dairy cow digestion process and performance. In this thesis aspects related to the effect of nitrogen fertilizer application on intensively grazed GWc and grass only swards (GO) and the effects of grazing both swards on dairy cow feeding behaviour, herbage depletion rate, rumen function

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8

Kemball, W. D. "Source-sink interrelationships in white clover (Trifolium repens L.)." Thesis, Bangor University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333705.

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9

Thompson, L. "The influence of radiation quality on the behaviour of grassland species." Thesis, Bangor University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234470.

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10

Franzmayr, Benjamin. "Metabolic Engineering of Isoflavonoid Biosynthesis in Tobacco and White Clover." Thesis, University of Canterbury. Biological Sciences, 2011. http://hdl.handle.net/10092/5568.

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Isoflavonoids are a class of plant secondary metabolites which have multiple biological roles in plants as pest feeding deterrents, phytoalexins and signals to rhizobial microbes. Some isoflavonoids, or their breakdown products, are estrogenic when ingested by animals, and pastures with high levels of the isoflavonoid formononetin can cause sterility in ewes. White clover has low levels of isoflavonoids and is susceptible to pests like the clover root weevil. The overall aim of this project was to test whether isoflavonoids could be manipulated in white clover through metabolic engineering. T

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11

Nurjaya, I. Gusti Made Oka. "Studies on the competitive ability of white clover (Trifolium repens L.) in mixtures with perennial ryegrass (Lolium perenne L.) : the importance of non-structural carbohydrate reserves and plant traits /." Title page, contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09APSP/09apspi11.pdf.

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12

Stone, Carol E. "Rhizobium strain selection by white clover under conditions of acidity stress." Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335442.

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13

Fowbert, John A. "Nodulation and nitrogen fixation by white clover (Trifolium repens L.) in the presence of mineral nitrogen." Thesis, University of Reading, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329349.

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14

Kertulis, Gina Marie. "Effects of nitrogen and cutting management on root growth and productivity of a Kentucky bluegrass (Poa pratensis L.) and white clover (Trifolium repens L.) pasture." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1882.

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Thesis (M.S.)--West Virginia University, 2001.<br>Title from document title page. Document formatted into pages; contains ix, 101 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 78-87).

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15

Shakeel, Mohammad Arshad. "The pest status of some invertebrate species associated with white clover Trifolium repens L." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329393.

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16

Holtham, Deborah Anne Lydia. "Enhanced soil structuring beneath white clover and its impact on nutrient transport." Thesis, University of Plymouth, 2006. http://hdl.handle.net/10026.1/2315.

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Previous work at IGER has revealed that soil structural differentiation under white clover is phenomenally rapid and enhanced when compared with ryegrass. White clover is one of the most nutritious and widely distributed forage legumes. Its use is advocated in sustainable systems of livestock production because of its ability to acquire atmospheric N through biological fixation in the root nodules. It thus provides an economically viable alternative to the N-demanding conventional system, and a possible solution to reduce the environmental impacts of nitrate leaching from agricultural land. Th

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17

Crockard, Martin A. "Molecular analyses of symbiotic and defense-related responses in white clover roots." Thesis, Queen's University Belfast, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301737.

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18

Gooding, Roderick F. "Cutting and grazing systems for grass/white clover Trifolium repens L. associations." Thesis, University of Glasgow, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264055.

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19

George, S. "The survival and growth of white clover (Trifolium repens) in upland soils." Thesis, University of Newcastle Upon Tyne, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370157.

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20

Chapman, D. F. "The assimilation and distribution of carbon in white clover (Trifoleum repens L.)." Thesis, University of Reading, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329220.

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21

Timberlake, Caitlin. "Urea Formulations on the Productivity of Bermudagrass and Bermudagrass-White Clover Pastures." UKnowledge, 2015. http://uknowledge.uky.edu/pss_etds/70.

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Bermudagrass (Cynodon dactylon L.) is a perennial warm-season grass that is very responsive to nitrogen (N) fertilization. Excessive N applications have negative environmental consequences and make maintaining mixed swards difficult. This study determined the effects of enhanced efficiency (EE) N fertilizers and fertilizer rate on bermudagrass yields, nutritive values, and white clover persistence. Nitrogen sources included urea, urea formulated with Agrotain® (U+A), urea with Agrotain® and dicyandiamide (SuperU), a polymer-coated urea (ESN), ESN+urea (75% ESN, 25% urea), and methylene urea (M

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22

Del, Pozo Ramos Manuel. "Sequential grazing of grass/white clover swards by cattle, sheep and goats." Thesis, University of Edinburgh, 1995. http://hdl.handle.net/1842/16978.

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Two experiments were conducted on sown grass/clover swards (<I>Lolium perenne - Trifolium repens</I>) to study the effect of domestic animal species (sheep, goats and cattle) on sward canopy structure and diet selection and animal performance of a subsequent grazing species. In Experiment 1, the effects of continuous grazing by sheep, goats or cattle at a sward surface height of 6 cm from mid-May to late July (Phase 1) were assessed. From late July until the end of August (Phase 2) swards were continuously grazed at 6 cm by sheep or goats. Sward composition and structure were measured by a str

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23

Parmenter, Graeme. "The effect of soil water shortage on ryegrass and white clover growing in mixtures." Thesis, University of Reading, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278085.

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24

Newton, P. C. D. "The establishment, growth and fate of white clover plants : With special reference to the physiology of stolon growth." Thesis, Bangor University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379353.

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25

Muraki, Tomohiro. "Effects of alternative grass species on grazing preference of sheep for white clover." Diss., Lincoln University, 2008. http://hdl.handle.net/10182/1095.

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Despite the importance of a high white clover (Trifolium repens) content in temperate pastoral systems in terms of livestock performance and nitrogen fixation, the proportion of white clover in grass-clover pastures is often low (<20%). This thesis examined in two experiments whether the white clover content of pastures could be improved by sowing white clover with alternative grass species to diploid perennial ryegrass (Lolium perenne L.). In a pasture experiment, DM production, pasture composition and morphology of grass-clover mixtures was measured over the establishment year (January 2007

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26

Evans, Thomas George. "Isolation of Cytokinin Biosynthesis and Metabolic Genes from White Clover (Trifolium repens L)." Thesis, University of Canterbury. School of Biological Science, 2009. http://hdl.handle.net/10092/4821.

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The factors influencing senescence in white clover (Trifolium repens L.) are of considerable importance to the pastoral sector of New Zealand’s economy. The plant hormones, ethylene and the cytokinins, have been implicated as having opposing influences on senescence. This project focused on the cytokinins. The rate limiting step in cytokinin biosynthesis is catalysed by isopentenyl transferase (IPT) and the primary enzyme in the degradation of cytokinins is cytokinin oxidase/dehydrogenase (CKX). Both IPT and CKX genes are present as multi-gene families. A reduction in the level of active cytok

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27

Martin, Pierre. "Genetic studies on resistance to alfalfa mosaic virus (AMV) and tolerance to white clover mosaic virus (WCMV) in red clover (Trifolium pratense L.)." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61820.

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28

Riffkin, Penelope A. "An assessment of white clover nitrogen fixation in grazed dairy pastures of South-Western Victoria /." [Richmond, N.S.W.] : University of Western Sydney, Hawkesbury, 1999. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030528.152118/index.html.

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29

Labuschagne, Johan. "Nitrogen management strategies on perennial ryegrass - white clover pastures in the Western Cape Province /." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019.1/1385.

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30

Riffkin, Penelope A. "An assessment of white clover nitrogen fixation in grazed dairy pastures of south-western Victoria." Thesis, [Richmond, N.S.W.] : University of Western Sydney, Hawkesbury, 1999. http://handle.uws.edu.au:8081/1959.7/31.

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Australia is amongst the more efficient milk producers in the world.Milk production in the region of south-western Victoria relies mainly on rainfed white clover/perennial ryegrass pastures.As the demand for efficient and competitive milk production increases, the value of N2 fixation must be maximised. The objective of this thesis was to assess N2 fixation in grazed dairy pastures in south-western Victoria. Several tests and experiments were conducted and results noted. Studies revealed low white clover yields to be the major factor limiting N2 fixation in the region. For N2 fixation to have

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31

Riffkin, Penelope A., of Western Sydney Hawkesbury University, and Faculty of Science and Technology. "An assessment of white clover nitrogen fixation in grazed dairy pastures of south-western Victoria." THESIS_FST_xxx_Riffkin_P.xml, 1999. http://handle.uws.edu.au:8081/1959.7/31.

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Australia is amongst the more efficient milk producers in the world.Milk production in the region of south-western Victoria relies mainly on rainfed white clover/perennial ryegrass pastures.As the demand for efficient and competitive milk production increases, the value of N2 fixation must be maximised. The objective of this thesis was to assess N2 fixation in grazed dairy pastures in south-western Victoria. Several tests and experiments were conducted and results noted. Studies revealed low white clover yields to be the major factor limiting N2 fixation in the region. For N2 fixation to have

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32

Stephens, P. M. "Competition between strains of Rhizobium trifolii for nodulation sites on the roots of white clover." Thesis, Queen's University Belfast, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374996.

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33

Al-Zarah, Mohamed I. "The effect of grazing management on the efficiency of utilization of grass/white clover swards." Thesis, University of Newcastle Upon Tyne, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443113.

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34

Scott, Gavin D. "Root system traits and root longevities in two contrasting cultivars of Trifolium repens (White clover)." Thesis, University of Aberdeen, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425002.

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This study uses sequential digital imaging of rhizotron grown root systems of white clover (<i>Trifolium repens</i>) to evaluate the developmental differences in the architecture of two cultivars with contrasting above-ground characteristics. Root lengths and leaf areas were correlated in both cultivars, with large leaved Alice producing greater leaf area and greater root length than the small leaved S184. The key architectural difference between the two cultivars was that Alice produced a higher ratio of terminal lateral length to axial length than S184. Lateral roots had lower survival ti

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35

Heshmati, Sara [Verfasser], Johannes [Akademischer Betreuer] Isselstein, Johannes [Gutachter] Isselstein, Stefan [Gutachter] Siebert, and Klaus [Gutachter] Dittert. "Effect of white clover and perennial ryegrass genotype on yield and forage quality of grass-clover and grass-clover-forb mixtures / Sara Heshmati ; Gutachter: Johannes Isselstein, Stefan Siebert, Klaus Dittert ; Betreuer: Johannes Isselstein." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://d-nb.info/1186372702/34.

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36

Payne, Kathryn Marie. "ENHANCED EFFICIENCY NITROGEN FORMULATION EFFECT ON GRASS-LEGUME PASTURE PRODUCTIVITY." UKnowledge, 2019. https://uknowledge.uky.edu/pss_etds/113.

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The use of nitrogen (N) fertilizer is generally restricted on mixed species forage systems due to its stimulatory effect on grasses which increases competition with legume species. Reduced legume growth from this competition can compromise forage nutritive value and prospective yields. The controlled-release nature of several enhanced efficiency fertilizer N products holds the potential to improve legume persistence in mixed species pastures while providing supplemental N required by the grass component. The studies contained in this dissertation evaluated the effect of different enhanced effi

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37

Rogers, Jacqueline Bolton. "Investigation of the role of mycorrhizas in the transfer of nitrogen from white clover to grass." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333833.

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38

Davidson, I. A. "An investigation into the physiological basis of the effects of nitrate on grass/white clover competition." Thesis, University of Reading, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373466.

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39

Febrer, Melanie. "Construction and assessment of tools for comparative structural genomic studies in white clover (Trifolium repens L.)." Thesis, Aberystwyth University, 2007. http://hdl.handle.net/2160/c0c89441-132f-41f8-80dd-2573dbd5758a.

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White clover is an allotetraploid legume with a genome size of ca 960 Mb and is widely used in Irish grasslands to improve the nutritional value of the forage by increasing the relative amounts of nitrogen present. White clover is closely related to Medicago truncatula, the diploid (genome size of ca 500 Mb) model legume chosen to study the symbiotic genetic programmes of plants and facilitate the genetics and breeding of important legume crops. This thesis describes the construction of a genetic map of a white clover mapping population composed of 94 F1 progeny bred in the Institute of Grassl

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40

Kelly, Rhys Owen. "Molecular and physiological aspects of arbuscular mycorrhizal symbiosis with near-isogenic white clover : a gene expression study." Thesis, University of South Wales, 2004. https://pure.southwales.ac.uk/en/studentthesis/molecular-and-physiological-aspects-of-arbuscular-mycorrhizal-symbiosis-with-nearisogenic-white-clover-a-gene-expression-study(d43e48e0-fee7-44d0-8c9f-5d690fe185b2).html.

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White clover (Trifolium repens L.) is an important component of low input pasture systems and can form effective associations with both nitrogen-fixing Rhizobium and phosphate-scavenging arbuscular mycorrhizal fungi (AMF). Understanding the genetic control of plant-AM interactions will allow clover breeders to develop genetic markers for selection of phenotypes favourable to AM symbiosis. Clover is normally an out-breeding species. Near-isogenic lines (NILs) developed from inbred lines of clover are ideal candidates for genetic studies since important agronomic traits are fixed. Four closely-r

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41

Elorong, E. E. M. "Factors affecting the response of perennial ryegrass (Lolium perenne L.) white clover (Trifolium repens L.) swards to fertilizer nitrogen." Thesis, University of Newcastle Upon Tyne, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332507.

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42

Lataste, Juan Carlos Dumont. "Studies on the relationships between a ryegrass (Lolium perenne L.) - white clover (Trifolium repens L.) sward and grazing dairy cows." Thesis, University of Reading, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276193.

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43

McAdam, James Henry. "A study of management factors affecting the contribution of white clover to swards for autumn grazing on improved hill land." Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317127.

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44

Ennos, E. D. "An investigation of effects of management, plant selection and growth regulators on seed production of white clover (Trifolium repens L.)." Thesis, University of Newcastle Upon Tyne, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374753.

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45

Büker, Patrick [Verfasser], and Willy [Akademischer Betreuer] Werner. "Development of a stomatal conductance model for white clover and its application for ozone flux predictions / Patrick Büker ; Betreuer: Willy Werner." Trier : Universität Trier, 2010. http://d-nb.info/1197696423/34.

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46

Assmann, Joice Mari. "Produção de forragem e sementes de trevo branco (Trifolium repens L.) em função de manejos de corte e doses de boro." Universidade Tecnológica Federal do Paraná, 2009. http://repositorio.utfpr.edu.br/jspui/handle/1/253.

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CAPES<br>Fabáceas forrageiras têm sido consorciadas com poáceas em sistema de integração lavoura-pecuária, sendo o trevo branco (Trifolium repens L.) uma das fabáceas mais utilizadas e adaptadas no Sul do Brasil. A aplicação de boro tem resultado em benefícios ao desenvolvimento da planta, especialmente para as fabáceas. Portanto, o objetivo deste trabalho foi avaliar os efeitos da aplicação de doses de boro e da remoção da matéria aérea das plantas por meio de cortes, sobre a produção de matéria seca, produção de sementes e concentração mineral de boro e nitrogênio em plantas de trevo branco,

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47

James, Nicola Lewis. "The management and utilisation of white clover/perennial ryegrass and perennial ryegrass swards in relation to milk production and behaviour of dairy cattle." Thesis, Bangor University, 1992. https://research.bangor.ac.uk/portal/en/theses/the-management-and-utilisation-of-white-cloverperennial-ryegrass-and-perennial-ryegrass-swards-in-relation-to-milk-production-and-behaviour-of-dairy-cattle(1a1a64ab-31af-40f0-9dcc-fd88c15e8795).html.

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The literature concerning the nutritional content of white clover as a grazed herbage or conserved crop offered to dairy cattle and aspects of frothy bloat are reviewed. In the first nine week change-over design experiment the effect on milk production and behaviour of spring calving dairy cows grazing white clover/grass swards at contrasting sward heights were examined. Grazing the clover/perennial ryegrass sward to a height of 4 cm increased clover content, but reduced milk production. The 8 cm sward increased milk yields by 15.8%. This was accompanied by an increase in fat and protein yield

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48

Roldan, Marissa B. "Expression of ACC oxidase genes in white clover (Trifolium repens L.) roots in response to phosphate supply : a thesis presented in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Plant Molecular Biology at Massey University, Palmerston North, New Zealand." Massey University, 2008. http://hdl.handle.net/10179/1133.

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The differential expression of members of the Trifolium repens ACC oxidase (TR-ACO) gene family and accumulation of TR-ACO proteins in white clover roots, and the temporal TR-ACO gene expression and TR-ACO protein accumulation in response to phosphate (Pi) stress has been investigated. Four-node stolon cuttings of wild type and transgenic white clover (designated TR-ACOp::GUS and TR-ACO1p::mGFP5-ER) plants were rooted and acclimatised in Hoagland’s solution, and then subjected to either a Pi sufficiency (1 mM Pi) treatment or a Pi depletion (10 µM Pi) treatment over a designated time course. U

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49

Streit, Juliane [Verfasser], Rolf [Akademischer Betreuer] Rauber, Rolf [Gutachter] Rauber, and Johannes [Gutachter] Isselstein. "Biomass, root distribution and overyielding potential of faba bean/wheat and white clover/ryegrass mixtures / Juliane Streit ; Gutachter: Rolf Rauber, Johannes Isselstein ; Betreuer: Rolf Rauber." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://d-nb.info/117811581X/34.

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50

Coady, Juanita R. "Undersowing rutabaga (Brassica napus L.) with white clover (Trifolium repens L.) : effects on the cabbage root maggot (Delia radicum (L.)) and its parasitoid/predator (Aleochara bilineata Gyll.) /." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ62377.pdf.

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