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Dissertations / Theses on the topic 'Weed interference'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Bitterlich, Iris. "Weed interference and weed control in cole crops and onion." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28920.

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Additive weed competition experiments were undertaken to study the effect of lamb's-quarters (Chenopodium album) interference on direct seeded broccoli. Lamb's-quarters (3, 8, 10, 12, and 15 plants m⁻²) began to affect broccoli growth 28 to 36 days after seeding. Decreases in crop growth increased with weed density as time after seeding increased. Yield data were fitted to a rectangular hyperbolic model which indicated that even one lamb's-quarters plant m⁻² could reduce total yield by 18 to 20 percent and marketable yield (head >10 cm across) by 22 to 37 percent. Lamb's-quarters reduced total

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2

Tungate, Kimberly Denise. "Environmental factors influencing weed interference in agricultural systems." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-07072004-001526/.

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In all agricultural systems using few or no herbicides, cultural and mechanical techniques are crucial to economic viability. Further advances in non-chemical weed control will require in-depth knowledge of weed biology. The objective of new strategies likely will be to alter competitive interactions between crop and weed species. An important part of weed biology, and often the basis for competitiveness, is species response to the environment. Environmental conditions differ greatly in different parts of the world. In agricultural systems, the low nitrogen status of some soils requires most c

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3

Shaffer, Gared Eric. "Critical duration of grass weed interference in grain sorghum." Thesis, Kansas State University, 2016. http://hdl.handle.net/2097/32615.

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Master of Science<br>Department of Agronomy<br>J.A. Dille<br>The availability of ALS-inhibitor herbicide-resistant grain sorghum hybrids will provide an opportunity to control grass weeds post-emergence with the ALS-inhibiting herbicide nicosulfuron (Zest[superscript]TM). More information on impact of grass weeds on sorghum yield are needed to optimize the application of nicosulfuron. The research objectives were to evaluate the impact of time of grass weed removal on grain sorghum yield when grown in different crop row spacing and seeding rates and to determine the critical duration of grass

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4

Steele, Gregory Lee. "Interference and control of sharppod morningglory (Ipomoea cordatotriloba dennstedt) in glyphosate-resistant cotton." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3292.

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Sharppod morningglory is a perennial vine commonly found infesting croplands in Texas and the southeastern United States. Previous research regarding morningglory competition and control primarily focused on annual Ipomoea. Interference, control, and herbicide translocation of sharppod morningglory could differ from that of other morningglories because of differences in growth and resource allocation. Therefore, field and laboratory experiments were conducted from 2001 to 2004 to: 1) determine the effects of seed-propagated and root-sprouted sharppod morningglory on cotton economic value, y

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5

Seeruttun, Sumantlall. "Weed management in sugar cane : critical periods of weed competition and mechanisms of interference from Paspalum paniculatum and P. urvillei." Thesis, University of Pretoria, 2009. http://hdl.handle.net/2263/25405.

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The aim of this project was to provide sound scientific underpinning for the development of new weed management strategies in sugar cane by exploring competition from the major weeds, and explaining the different mechanisms of weed interference from Paspalum paniculatum and P. urvillei. Critical periods of weed control (CPWC) were studied in six field trials. In ratoon cane, CPWC with natural weed infestations started between 228 and 916 growing degree days (GDD), and ended between 648 and 1311 GDD, depending on the site and cane variety. These results represented a maximum CPWC of 12 to 28 we

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6

Seeruttun, Sumantlall. "Weed management in sugar cares critical periods of weed competition and mechanisms of interference from Paspalum paniculatum and P. urvillei /." Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-06102009-161410/.

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7

Virtue, John Garry. "Weed interference in the annual regrowth cycle of plantation tea tree (Melaleuca alternifolia)." Thesis, The University of Sydney, 1997. https://hdl.handle.net/2123/27629.

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Tea tree, Melaleuca alternifolia, is an evergreen tree, native to freshwater swamp and creek margins on the mid-eastem coast of Australia. The leaf essential oil has antimicrobial properties, and is used commercially in various health care products, toiletries and cosmetics. Plantation production has been centred on the north coast of New South Wales. Tea trees are planted as seedlings and shoots are first harvested to near-ground level at 12-24 months after planting. Tea tree oil is obtained from the shoot material by steam distillation Tea tree readily coppices, and shoot regrowth fro

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8

Nambili, Julia Nghituvali. "The interference potential of nine selected South African spring wheat cultivars with selected weed species." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019.1/1631.

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9

Refsell, Dawn E. "Integrated weed management in Kansas winter wheat." Diss., Kansas State University, 2013. http://hdl.handle.net/2097/15742.

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Doctor of Philosophy<br>Department of Agronomy<br>J. Anita Dille<br>Integrated weed management (IWM) is an ecological approach to weed control that reduces dependence on herbicides through understanding of weed biology and involves using multiple weed control measures including cultural, chemical, mechanical and biological methods. The critical period of weed control is the duration of the crop life cycle in which it must be kept weed-free to prevent yield loss from weed interference. Eight experiments were conducted throughout Kansas between October 2010 and June 2012 to identify this perio

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10

Van, Acker Rene C. "Multiple-weed species interference in broadleaved crops : evaluation of yield loss prediction and competition models." Thesis, University of Reading, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308562.

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11

SANTOS, Thain? Alves dos. "Crescimento de esp?cies florestais em conviv?ncia com Urochloa brizantha (Hochst. ex A. Rich.) Stapf cv. Marandu." Universidade Federal Rural do Rio de Janeiro, 2017. https://tede.ufrrj.br/jspui/handle/jspui/2365.

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Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2018-08-22T18:44:56Z No. of bitstreams: 1 2017 - Thain? Alves dos Santos.pdf: 3011465 bytes, checksum: dfa12c411a3f74638a41876a450cb72d (MD5)<br>Made available in DSpace on 2018-08-22T18:44:56Z (GMT). No. of bitstreams: 1 2017 - Thain? Alves dos Santos.pdf: 3011465 bytes, checksum: dfa12c411a3f74638a41876a450cb72d (MD5) Previous issue date: 2017-02-20<br>CAPES<br>The presence of exotic grasses in areas for reforestation is one of the main obstacles to the growth and survival of planted individuals, whether through competition for resources

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12

Clewis, Scott Barton. "Economic Assessment of New Weed Management Technologies in Strip- and Conventional-Tillage Cotton and Peanut and Common Ragweed Interference in Peanut." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20011112-094020.

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<p>Low commodity prices and environmental concerns have compelled cotton growers to increase production efficiency while decreasing inputs. Research evaluated weed interference, strip-tillage production, transgenic cultivars, and new herbicides to improve weed management in peanut and cotton. The rectangular hyperbola model described the effect of common ragweed density on percent peanut yield loss. With the asymptote constrained to 100% maximum yield loss, the I coefficient (yield loss per unit density as density approaches zero) was 68.3 + 12.2%. Common ragweed height was not affected by wee

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13

Giancotti, Paulo Roberto Fidelis [UNESP]. "Interação entre Sorgo Sacarino e plantas daninhas." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/132898.

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Submitted by PAULO ROBERTO FIDELIS GIANCOTTI null (paulogiancotti@gmail.com) on 2016-01-17T13:09:22Z No. of bitstreams: 1 Tese - Paulo Giancotti.pdf: 604609 bytes, checksum: 5380cd245b316215f5206eef774e7315 (MD5)<br>Approved for entry into archive by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br) on 2016-01-18T16:23:41Z (GMT) No. of bitstreams: 1 giacontti_prf_dr_jabo.pdf: 604609 bytes, checksum: 5380cd245b316215f5206eef774e7315 (MD5)<br>Made available in DSpace on 2016-01-18T16:23:41Z (GMT). No. of bitstreams: 1 giacontti_prf_dr_jabo.pdf: 604609 bytes, checksum: 5380cd245b3

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14

Oliveira, Francisco das Chagas Santos de. "Interferência das plantas daninhas na produtividade e nutrição da cultura do milho verde em São Luís-MA." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/154430.

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Submitted by Francisco das Chagas Santos de Oliveira (francisco.oliveira63@hotmail.com) on 2018-07-02T21:50:09Z No. of bitstreams: 1 DISSERTAÇÃO DEFINITIVA.pdf: 1020140 bytes, checksum: 23a863728dda618ce113cd0231e93e4c (MD5)<br>Approved for entry into archive by Neli Silvia Pereira null (nelisps@fcav.unesp.br) on 2018-07-03T13:18:43Z (GMT) No. of bitstreams: 1 oliveira_fcs_me_jabo.pdf: 1020140 bytes, checksum: 23a863728dda618ce113cd0231e93e4c (MD5)<br>Made available in DSpace on 2018-07-03T13:18:43Z (GMT). No. of bitstreams: 1 oliveira_fcs_me_jabo.pdf: 1020140 bytes, checksum: 23a863728dda

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15

Silva, Janaína de Assis. "Interferência de plantas daninhas na cultura do milho cultivado em segunda safra com dois espaçamentos." Universidade Federal de Goiás, 2017. http://repositorio.bc.ufg.br/tede/handle/tede/7676.

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Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2017-08-15T12:16:42Z No. of bitstreams: 2 Dissertação - Janaína de Assis Silva - 2017.pdf: 1125529 bytes, checksum: db2bd96979a55f5960d44d645ef02e20 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-08-15T12:17:12Z (GMT) No. of bitstreams: 2 Dissertação - Janaína de Assis Silva - 2017.pdf: 1125529 bytes, checksum: db2bd96979a55f5960d44d645ef02e20 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Made a

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16

Kati, Vaia. "Interference between small grain cereals and weeds with implications for allelopathy." Thesis, University of Reading, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394127.

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17

Van, der Laan Michael. "Allelopathic interference potential of the alien invader plant Parthenium hysterophorus." Diss., Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-04042007-134659.

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18

Bayer, Jennifer L. "An eight-week forrest yoga intervention for chronic pain: effect on pain interference, pain severity, and psychological outcomes." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6364.

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Background: Chronic pain conditions are pervasive, debilitating, and costly problems across the globe, yet medical treatments often fail to relieve the patients of pain. As a result, complementary treatments, such as yoga, are often used in an attempt to reduce pain and disability. Yoga seems to be effective in short-term relief of pain and, in some cases, helps alleviate psychological comorbidities associated with pain, such as depression and anxiety. The purpose of the current study was to evaluate the efficacy of an eight-week Forrest Yoga intervention on pain interference, pain severity, a

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19

Duarte, Daniel José [UNESP]. "Interferência da comunidade infestante na cultura da soja tolerante ao Glyplosate." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/96982.

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Made available in DSpace on 2014-06-11T19:28:32Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-06-10Bitstream added on 2014-06-13T19:16:34Z : No. of bitstreams: 1 duarte_dj_me_jabo.pdf: 646154 bytes, checksum: 6c15911c4bb3a0a97a92a9d46a1e98e8 (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Um dos mais importantes fatores que afetam negativamente o crescimento, produtividade e qualidade do produto da soja é a interferência proporcionada pelas plantas daninhas. Assim, este trabalho foi conduzido com o objetivo de estudar a evolução fitossociológica da comunida

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20

Carvalho, Leonardo Bianco de [UNESP]. "Efeitos de períodos de interferência na comunidade infestante e na produtividade da beterraba." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/96953.

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Made available in DSpace on 2014-06-11T19:28:31Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-12-19Bitstream added on 2014-06-13T20:18:18Z : No. of bitstreams: 1 carvalho_lb_me_jabo.pdf: 604690 bytes, checksum: 9effc91615f0ae69118f48865d1d6e4e (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Funep<br>A interferência das plantas daninhas em agroecossistemas olerícolas é muito intensa em função do sistema de produção das culturas nesse tipo de ambiente. Para o desenvolvimento de programas de manejo das plantas daninhas, estudos ecológicos das comunidades

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21

Duarte, Daniel José. "Interferência da comunidade infestante na cultura da soja tolerante ao Glyplosate /." Jaboticabal : [s.n.], 2009. http://hdl.handle.net/11449/96982.

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Orientador: Robinson Antonio Pitelli<br>Banca: Núbia Maria Correia<br>Banca: Dagoberto Martins<br>Resumo: Um dos mais importantes fatores que afetam negativamente o crescimento, produtividade e qualidade do produto da soja é a interferência proporcionada pelas plantas daninhas. Assim, este trabalho foi conduzido com o objetivo de estudar a evolução fitossociológica da comunidade infestante crescendo em convivência com a cultura da soja por diferentes períodos, a determinação do PAI e estudar a dominância relativa dos macronutrientes por parte das plantas daninhas e da soja para as condições ex

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22

Carvalho, Leonardo Bianco de. "Efeitos de períodos de interferência na comunidade infestante e na produtividade da beterraba /." Jaboticabal : [s.n.], 2007. http://hdl.handle.net/11449/96953.

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Resumo: A interferência das plantas daninhas em agroecossistemas olerícolas é muito intensa em função do sistema de produção das culturas nesse tipo de ambiente. Para o desenvolvimento de programas de manejo das plantas daninhas, estudos ecológicos das comunidades infestantes são de suma importância em razão da vegetação daninha ser conseqüência das condições ecológicas criadas artificialmente pelo homem nos agroecossistemas. O presente trabalho foi desenvolvido com objetivo de realizar estudos fitossociológicos na comunidade infestante da cultura da beterraba de mesa e determinar os períodos

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23

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.

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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

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24

Fischer, David William. "Weed management options with herbicide resistant field corn and common lambsquarters interference in field corn." 1999. http://catalog.hathitrust.org/api/volumes/oclc/43938469.html.

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25

Mkula, Ntombizanele Precious. "Allelopathic interference of silverleaf nightshade (Solanum elaeagnifolium Cav.) with the early growth of cotton (Gossypium hirsutum L.)." Diss., 2007. http://hdl.handle.net/2263/27474.

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Silverleaf nightshade (Solanum elaeagnifolium), a perennial broadleaf weed, has become a serious pest in many semi-arid areas of the world. Control of silverleaf nightshade is confounded by its ability to produce thousands of viable seeds from a single mother plant, a deep and well-developed root system and the ability to propagate vegetatively from creeping lateral roots, root fragments and from rhizomes. Exacerbating factors are longevity of its propagules in soil, particularly under adverse environmental conditions. Currently, in South Africa, it is one of the more serious weeds in cotton (

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26

Thuruthel, Rachel C. "Weed interference in soybeans: a bioeconomic analysis of cocklebur control using alternative herbicides and management systems." 1989. http://hdl.handle.net/2097/23674.

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27

Wilcox, Douglas Howard. "Models of interference in monocultures and mixtures of wheat (Triticum aestivum L.) and quackgrass (Elytrigia repens (L.) Nevski.)." 2009. http://hdl.handle.net/1993/3121.

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Quackgrass is the most serious perennial grassy weed of wheat in Manitoba. Field experiments and surveys investigating the nature and extent of interference in monocultures and mixtures of quackgrass and wheat were conducted over the years 1987 to 1989 at Portage La Prairie, Manitoba, Canada. Intraspecific and interspecific interference between spring wheat and quackgrass was investigated in the field using an additive series design consisting of five replacement series proportions at total stand densities of 75, 150, and 300 plants sqM. A revised synthetic no-interaction analysis determined t

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28

Wilcox, Douglas Howard. "Biology and control of Bromus pectinatus Thunb." 2009. http://hdl.handle.net/1993/3122.

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Investigations into the biology and control of the annual grassy weed Bromus pectinatus Thunb. were conducted at the National Plant Breeding Station, Njoro, Kenya, from 1982 to 1984. Pot growth of B. pectinatus was influenced by soil type and microclimate, but not by seed origin. B. pectinatus was germinated and grown in amended and untreated soils ranging in pH from 3.05 to 8.13. Soils with a pH near 3 could not support growth or germination of B. pectinatus. B. pectinatus grew best on a soil of pH 6.55 and when soil pH influenced germination the optimum soil pH was 6.0. Exposure to light in

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29

Sheley, Roger Leslie. "Life-history, growth and interference of cheatgrass (Bromus tectorum L.) and yellow starthistle (Centaurea solstitialis L.) /." 1993. http://hdl.handle.net/1957/10103.

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