Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 52 for “"herbicide application"”.
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Sensing and Control for Real-Time Machine Vision-Based Selective Herbicide Application Under Outdoor Field Conditions
… by sprayer vehicle a way of directing the herbicide onto the weeds when they are sensed by the sensing system. A design methodology for this ""real-distance"" control was developed and the system was tested under controlled outdoor field conditions. It exhibited a 91 percent hit accuracy …
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Effect of invasive phragmites australis and its control on microbial community composition in a freshwater wetland
… invasion and restoration efforts employing herbicide to remove Phragmites would further disrupt communities. This was tested in freshwater wetlands using terminal restriction fragment length polymorphism analysis of PCR amplified eubacterial DNA from soils dominated by Typha and Phragmites …
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Near-infrared reflectance soil organic matter sensor
… control input for the variation of soil-applied herbicide application rates. Control based on organic matter content could eliminate overapplication on less productive areas within a field, thereby improving profitability and reducing the potential for groundwater contamination.
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Monitoring biodiversity of San Francisco Peninsula grasslands using Lepidoptera as a bioindicator
… for use on the San Francisco Peninsula: herbicide application, conservation grazing, and prescribed fire. In this paper, I will evaluate the use of the taxa Lepidoptera as a bioindicator of biodiversity to assess the environmental impacts of these techniques. The application of herbicide …
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A Study of the Effect of Herbicides on Mycorrhizae Associated With Native Warm Season Grass
… growing in native prairie and sterile soil. All herbicide treatments caused a negative effect on plants and mycorrhizal colonization. Plant survival was directly correlated with the presence of mycorrhizae and lower rate of herbicides applied. Herbicide application appeared to have little effect …
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Uptake, translocation, and metabolism 2,4-D in enlist crops and control of drought-stressed waterhemp (Amaranthus tuberculatus) with 2,4-D and glyphosate
The synthetic auxin herbicide, 2,4-dichlorophenoxyacetic acid (2,4-D), is one of the oldest and most widely-used herbicides in the world and is a systemic, postemergence (POST) herbicide that is selective in monocots such as corn, wheat, sorghum, and turf, but dicots are sensitive to 2,4-D. Auxin …
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A Method for replacing serrated tussock (Nassella trichotoma) with kangaroo grass (Themeda triandra) in lowland native grassland remnants
… and follow-up treatment with either of the herbicides, glyphosate (as Monsanto Roundup®) or atrazine (as Nufarm Nutrazine®). These steps resulted in close to 100% kill of mature N. trichotoma plants. Greater than 98% replacement of N. trichotoma with T. triandra was achieved by thatching …
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Canada thistle (Cirsium arvense [L.] Scop.) response to mowing, herbicide, competitive grasses, and soil amendments on wetland, upland, and mesic sites
… a significant challenge for land managers. Herbicide application can be effective, but mixed results, toxicity concerns, and the need for re-application demand new, more efficient strategies that reduce herbicide use. A greenhouse study tested effectiveness of clipping and grass seeding for …
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Responses of selected chickpea cultivars to imidazolinone herbicide
… in Saskatchewan, there is heavy reliance on herbicides. The chickpea breeding program at the Crop Development Centre, University of Saskatchewan, has developed chickpea cultivars with resistance to imidazolinone (IMI) class of herbicides. The objectives of this study were: (i) to examine the …
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Dissipation and potential crop injury for soil applied clomazone, chlorimuron, imazaquin, and imazethapyr
Cultural practices such as tillage and method of application can influence herbicide persistence, dissipation processes, and subsequent crop injury. In field studies, the influence of tillage system and herbicide application method on dissipation rate and potential for injury to corn (Zea mays) was …
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Enhancement of Floral Species Richness in Glaciated Prairie Temporary Wetlands
… treatments were a combination of (1) application of glyphosate herbicide (spray); (2) cutting and removal of vegetation (mow); (3) disturbance of soil using a field disc (disc); (4) application of seed purchased from a seed vendor (purchased seed); and (5) application of seed collected …
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Consumers and Benefits of Genetically Modified Vegetables
… such as increased pest resistance, greater herbicide resistance, and increased yields the growers have accepted them. The next wave of biotech crops have second-generation traits, such as improved nutrient content, extended shelf life, reduced pesticide and herbicide application (a consumer …
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Perpetual Mobilization and Environmental Injustice: Race and the Contested Development of Industrial Agriculture in the Yazoo-Mississippi Delta.
… ownership is highly concentrated, aerial herbicide application kills adjacent vegetable crops and a disarticulated food system hinders marketing possibilities—while producing health and income inequalities. In this thesis, I explore the historical roots of contemporary injustices, showing …
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Fire and non-native grass invasion across a heterogeneous landscape in the Central Hardwoods
… measures such as torching, hand pulling, and herbicide application.
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Interactions of post emergence herbicides, strobilurin fungicides and Rhizoctonia root rot of soybean
… soybeans has increased the use of non-glyphosate herbicides. However, some of these herbicides may increase the severity of root rot caused by Rhizoctonia solani Field and greenhouse studies were conducted to evaluate the potential interaction among glyphosate-tolerant soybeans, post emergence …
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Control and Fecundity of Palmer Amaranth (Amaranthus palmeri) and Common Ragweed (Ambrosia artemisiifolia) from Soybean Herbicides Applied at Various Growth and Development Stages
… and acetolactate synthase (ALS) inhibiting herbicides resulting in the use of protoporphyrinogen oxidase- (PPO) inhibitors to control these biotypes, although PPO-resistant biotypes are increasing. New soybean herbicide-resistant trait technologies enable novel herbicide combinations. …
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Effects of prescribed burning, mechanical and chemical treatments to curtail rhododendron dominance and reduce wildfire fuel loads
… in heavy sprouting and increased fuel loading. Herbicide application did not reduce or increase fuel loading and was important in R. maximum control only when combined with other treatments. The prescribed burning treatment was the least expensive individual treatment while mechanical cutting …
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Characterization of the Mechanism of Resistance of a Johnsongrass (Sorghum halepense) Biotype to Selected Graminicides in Virginia and Response of Mugwort (Artemisia vulgaris) to Specific Herbicidal and Cultural Control Strategies
… resistance to the aryloxyphenoxypropionate (APP) herbicides quizalofop-P and fluazifop-P and the cyclohexanedione (CHD) herbicide sethoxydim. Additional laboratory experiments revealed that resistance is not due to differential absorption, translocation, or metabolism of the APP and CHD herbicides …
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A Comparison of Management Strategies for the Federally Endangered Running Buffalo Clover (Trifolium stoloniferum) on the Blue Grass Army Depot, KY
… strategies such as cattle grazing, mowing, and herbicide application have never been compared in a controlled study. We evaluate the efficacy of these techniques on the Blue Grass Army Depot (BGAD) in Madison County, KY, where one of T. stoloniferum’s largest populations occurs. Fifty-nine …
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HERBICIDE TRANSPORT FROM LAND TO SURFACE WATER IN AN ARTIFICIALLY DRAINED CATCHMENT
… In this thesis the processes contributing to herbicide transport from land to surface water were examined, using a combination of existing data analysis, modelling, and monitoring. Field investigations of herbicide transport were conducted on an artificially drained field dominated by heavy …
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