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Dissertations / Theses on the topic 'Carrion and weed germination'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Loddo, Donato. "Emergence modeling to improve integrated weed management." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3422734.

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Weeds represent the main cause of economic losses in agriculture worldwide, both as crop yield reduction and control costs. Integrated Weed Management plays therefore a key role in order to achieve environmental, social and economic sustainability of crop production. Modeling of weed biological cycles may be an important component of IWM. Models able to predict weed emergence dynamics and weed-crop competition may provide useful indications about timing, type and economic convenience of control measures. The main objective of the research project presented in this Thesis is to develop a Decisi

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2

Manoto, Martha Mmamontsheng. "Germination and competition studies on selected weed species in cereal cropping systems in the Western Cape." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52862.

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Thesis (MSc)--Stellenbosch University, 2002.<br>ENGLISH ABSTRACT: The high cost of herbicides for weed control in crop fields in the Western Cape is a major cause of reducing farmers' net income. As chemical weed control became more difficult and expensive, it became necessary to focus on the technique of reducing weed impact, which does not only involve herbicide usage. Aspects such as tillage method, sowing date of crops, crop rotation, weed ecology and germination requirements, amongst other, may play a role in reducing weed impact. The first experiment was done to determine whether t

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3

Pittman, Kara Brooke. "High Residue Cover Crops for Annual Weed Suppression in Corn and Soybean Production and Potential for Hairy Vetch (Vicia villosa) to be Weedy." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/82041.

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After termination, cover crop residue can suppress weeds by reducing sunlight, decreasing soil temperature, and providing a physical barrier. Experiments were implemented to monitor horseweed suppression from different cover crops as well as two fall-applied residual herbicide treatments. Results suggest that cover crops, other than forage radish in monoculture, can suppress horseweed more consistently than flumioxazin + paraquat or metribuzin + chlorimuron-ethyl. Cover crop biomass is positively correlated to weed suppression. Subsequent experiments were designed to determine the amount of we

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4

Pittman, Kara. "High Residue Cover Crops for Annual Weed Suppression in Corn and Soybean Production and Potential for Hairy Vetch (Vicia villosa) to be Weedy." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/82041.

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After termination, cover crop residue can suppress weeds by reducing sunlight, decreasing soil temperature, and providing a physical barrier. Experiments were implemented to monitor horseweed suppression from different cover crops as well as two fall-applied residual herbicide treatments. Results suggest that cover crops, other than forage radish in monoculture, can suppress horseweed more consistently than flumioxazin + paraquat or metribuzin + chlorimuron-ethyl. Cover crop biomass is positively correlated to weed suppression. Subsequent experiments were designed to determine the amount of we

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5

Bain, Kandee. "VARIATION BETWEEN PERIPHERAL AND CENTER ACHENE MORPHOLOGY AND ATTRIBUTES OF ACHENE GERMINATION IN THE INVASIVE SPECIES, CENTAUREA MELITENSIS." CSUSB ScholarWorks, 2015. https://scholarworks.lib.csusb.edu/etd/256.

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Invasive species are often successful and problematic because of their ability to persist in disturbed and undisturbed environments despite weed management practices. Understanding reproduction and dispersal strategies in these species can aid in developing management approaches to help control their spread. Centaurea melitensis, a nonnative invasive with European origins, is found in disturbed areas of southern California. It produces three different types of flower heads that develop at different times and at different locations on the plant during the growing season. The chasmogamous (CH) f

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6

Esser, Andrew Ross. "Maternal environmental factors influencing kochia (Kochia scoparia) seed characteristics." Thesis, Kansas State University, 2014. http://hdl.handle.net/2097/17750.

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Master of Science<br>Department of Agronomy<br>Anita Dille<br>A better understanding of kochia (Kochia scoparia) seed characteristics is necessary for long term management of this increasingly troublesome weed. The objectives were to evaluate maternal environmental factors influencing kochia seed produced in the field and to document variability in dormancy and seed viability produced within a single kochia plant grown in the greenhouse or field. Field experiments were conducted in 2012 and 2013 at the Kansas State Agricultural Research Center in Hays. Two different kochia biotypes from Hay

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7

Omami, Elizabeth Nabwile, of Western Sydney Hawkesbury University, of Agriculture Horticulture and Social Ecology Faculty, and School of Horticulture. "Amaranthus retroflexus seed dormancy and germination responses to environmental factors and chemical stimulants." THESIS_FAHSE_HOR_Omami_E.xml, 1993. http://handle.uws.edu.au:8081/1959.7/66.

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A large number of weed seeds in the soil persist because of seed dormancy, and depletion of the seed bank through manipulation of seed dormancy has been suggested as one of the goals in weed control. This study was designed to investigate some of the factors which control dormancy and germination in Amaranthus retroflexus seeds. Germination studies were conducted at different temperatures, and either in continuous white light or in the dark. Higher temperatures increased germination and, although light interacted with temperature, its effect on germination varied with the temperature. In an at

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8

Osipitan, Omobolanle Adewale. "Relative ecological fitness of glyphosate-resistant kochia from western Kansas." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/34463.

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Doctor of Philosophy<br>Department of Agronomy<br>Johanna A. Dille<br>Kochia (Kochia scoparia L. Schrad.), one of the most problematic weeds in the Great Plains of United States, has evolved resistance to some herbicides including glyphosate (5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) inhibitor) which was first reported in western Kansas in 2007. The objectives of this research were to (1) characterize six kochia populations from western Kansas on the basis of glyphosate resistance or multiple herbicide resistance, (2) determine germination characteristics of the populations and evalu

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9

Asshleb, Almabrouk A. "The use of the fungus Ascochyta caulina as a biological control agent for the weed Chenopodium album. Evaluation of the bioherbicide formulation efficacy of Ascochyta caulina on different life stages of the weed plant Chenopodium album under laboratory and field conditions comparing Libyan and UK populations." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4431.

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Chenopodium album is considered one of the most important weeds adversely affecting agricultural production due to its highly competitive influence on field crops. Chemical herbicides have increased the efficiency of farming, but recently problems of herbicideresistant weed populations and herbicide residues in soil, water, food products and effects on non-target organisms have increased, consequently, other methods of control of weeds by using specific fungi as herbicides have been suggested. The purpose of this research was to evaluate the biological control of the weed Chenopodium alb

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10

Omami, Elizabeth Nabwile. "Amaranthus retroflexus seed dormancy and germination responses to environmental factors and chemical stimulants." Thesis, [S.l. : s.n.], 1993. http://handle.uws.edu.au:8081/1959.7/66.

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A large number of weed seeds in the soil persist because of seed dormancy, and depletion of the seed bank through manipulation of seed dormancy has been suggested as one of the goals in weed control. This study was designed to investigate some of the factors which control dormancy and germination in Amaranthus retroflexus seeds. Germination studies were conducted at different temperatures, and either in continuous white light or in the dark. Higher temperatures increased germination and, although light interacted with temperature, its effect on germination varied with the temperature. In an at

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11

Asshleb, Almabrouk Amer. "The use of the fungus Ascochyta caulina as a biological control agent for the weed Chenopodium album : evaluation of the bioherbicide formulation efficacy of Ascochyta caulina on different life stages of the weed plant Chenopodium album under laboratory and field conditions comparing Libyan and UK populations." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4431.

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Chenopodium album is considered one of the most important weeds adversely affecting agricultural production due to its highly competitive influence on field crops. Chemical herbicides have increased the efficiency of farming, but recently problems of herbicideresistant weed populations and herbicide residues in soil, water, food products and effects on non-target organisms have increased, consequently, other methods of control of weeds by using specific fungi as herbicides have been suggested. The purpose of this research was to evaluate the biological control of the weed Chenopodium album by

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12

Bailey, William Anthony. "Herbicide-based Weed Management Systems for Potato (Solanum tuberosum) and Wheat (Triticum aestivum) and Growth and Reproductive Characteristics of Smooth Pigweed (Amaranthus hybridus)." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/28578.

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Integrated weed management involves the utilization of weed biology principles to develop effective and economical control strategies. This research involved investigations of herbicide-based weed management programs in potato (<i>Solanum tuberosum</i> L.) and winter wheat (<i>Triticum aestivum</i> L.) as well as investigations of the biological characteristics of smooth pigweed (<i>Amaranthus hybridus</i>), a troublesome species in many crops. Sulfentrazone is an herbicide registered for use in soybean [<i>Glycine max</i> (L.) Merr.] and tobacco (<i>Nicotiana tabacum</i> L.) that may also h

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13

Silva, Erisson Marques da. "Aspectos da propagação de Stigmaphyllon blanchetii C. E. Anderson." Universidade Federal de Alagoas, 2016. http://www.repositorio.ufal.br/handle/riufal/3441.

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Among the main problems of modern agriculture weeds is very important, especially for the high adaptability, efficient use of available resources and rapid development. In sugarcane several species have been reported as weeds, but little is known about the species known popularly as rat tail (Stigmaphyllon blanchetii), especially in respect to their biology. Knowing the biology of a weed management strategies become more effective. Thus, the study aimed to study the phenology and growth-tail mouse come from vegetative propagation, as well as to the germination test of their seeds under differe

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14

Buru, Joshua Comrade. "Comparative biology of two forms of an invasive vine, Dolichandra unguis-cati (L.) Lohmann (Bignoniaceae): implications for weed spread and biocontrol." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/102084/1/Joshua%20Comrade_Buru_Thesis.pdf.

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This thesis is a comparative study of two distinct forms ('long pod' and 'short pod') of an invasive vine, cat’s claw creeper. The two forms have differing prevalence rates in Australia. The thesis examines important plant traits that could explain this variation in prevalence between the forms. The thesis covers seed biology, anatomical and growth traits, together with physiological traits in response to two levels of light, water and nutrients resources. In addition, the study assesses preferences of two bio-agents (insects) against the two forms of cat’s claw creeper to ascertain bio-contro

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15

Rounsaville, Todd J. "INVASION DYNAMICS OF THE EXOTIC LIANA EUONYMUS FORTUNEI (TURCZ.) HAND.-MAZZ. (WINTERCREEPER)." UKnowledge, 2017. http://uknowledge.uky.edu/biology_etds/40.

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Elevated atmospheric CO2 has been implicated as a driver of increased liana abundance worldwide. Known as disturbance creators and beneficiaries, lianas possess the potential to significantly influence forest ecosystems. I investigated the early-invasion dynamics of Euonymus fortunei (wintercreeper), an evergreen liana that is invading forests in eastern North America, disrupting native plant communities and ecosystem functions. Wintercreeper is widely cultivated as an ornamental groundcover, frequently invading natural areas via asexual stem growth. Invasion of remote natural areas is depende

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16

Bithell, S. L. "An evaluation of Solanum nigrum and S. physalifolium biology and management strategies to reduce nightshade fruit contamination of process pea crops." Lincoln University, 2004. http://hdl.handle.net/10182/1160.

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The contamination of process pea (Pisum sativum L.) crops by the immature fruit of black nightshade (Solanum nigrum L.) and hairy nightshade (S. physalifolium Rusby var. nitidibaccatum (Bitter.) Edmonds) causes income losses to pea farmers in Canterbury, New Zealand. This thesis investigates the questions of whether seed dormancy, germination requirements, plant growth, reproductive phenology, or fruit growth of either nightshade species reveal specific management practices that could reduce the contamination of process peas by the fruit of these two weeds. The seed dormancy status of these we

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17

Rothlisberger, Katie Lynn. "Effects of Oilseed Meals on the Germination, Growth, and Survival of Crop and Weed Species." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8793.

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Oilseed crops are being widely evaluated for potential biodiesel production. Seed meal (SM) remaining after extracting oil may have use as a bioherbicide or organic fertilizer. Brassicaceae SM often contains glucosinolates that can hydrolyze into biologically active compounds. Jatropha curcas SM does not contain glucosinolates but contains curcin, a known phytotoxin (toxalbumin). A 14-d greenhouse study was conducted to determine how Sinapis alba (white mustard, WM), Brassica juncea (Indian mustard, IM), Camelina sativa (camelina) and Jatropha curcas (jatropha) applied to soil at varying appli

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18

Mehmeti, Arben [Verfasser]. "Arable weed vegetation and germination traits of frequent weeds in Kosovo / presented by Arben Mehmeti." 2009. http://d-nb.info/1000180247/34.

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19

Skinner, Emillie Ruth McChesney. "Allelopathic effects of the cover crop Crotalaria juncea on weed and crop seedling germination and growth." 2006. http://purl.galileo.usg.edu/uga%5Fetd/skinner%5Femillie%5Fr%5F200612%5Fms.

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20

"ASSESSING THE POTENTIAL INVASIVENESS OF CHINESE PLANT SPECIES IN CANADIAN PRAIRIE PROVINCES." Thesis, 2016. http://hdl.handle.net/10388/ETD-2016-02-2442.

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Weed seed contaminants in agricultural products from China in recent years have the potential for introducing new invasive plant species. Seeds of 169 weedy species from 39 families were collected from Chinese farmlands. Fifty-eight of these that are currently absent in Canada were evaluated. Two weed risk assessment (WRA) models (modified WRA+ secondary screen tool and weed elsewhere+ modified WRA+ secondary screen tool) rejected all invasive plant species and showed similar accuracy in non-invasvie plant species prediction based on 140 existing alien plant species in Canada, yet the second W

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21

Kalibbala, Faith Nandawula. "The performance of the seed feeding bruchid beetle Sulcobruchus subsuturalis (Pic) (Cleoptera: Bruchidae) in the biological control of Caesalpinia decapetala (Roth) Alston (Fabaceae) an invasive weed in South Africa." Thesis, 2009. http://hdl.handle.net/10539/6785.

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The release of the seed eating beetle Sulcobruchus subsuturalis for biological control of Caesalpinia decapetala in South Africa has been ongoing since 2000. This is the first post release evaluation of the efficacy of the agent against the weed. The study assessed the phenology of C. decapetala and S. subsuturalis at two sites and included determining the establishment of the beetle on the target weed at 25 study sites. In addition, the effects of S. subsuturalis on seed densities as well as seed germination and seedling recruitment were examined. Furthermore predation by native ants an

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22

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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