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 30 for “"herbicide treatment"”.
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The effects of herbicide treatment on a reservoir ecosystem
… no measurable changes in water quality after treatment and macrophyte die-off with the exception of a general decrease in dissolved oxygen; no fish kills were observed. Both herbicides declined to very low levels in the water 3 days after treatment and were undetectable within 16 days after …
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CHALLENGES TO ESTABLISHING OAKS AND PECAN IN BOTTOMLAND FORESTS IN THE POST OAK SAVANNAH AND BLACKLAND PRAIRIE
… Pecan seedlings receiving the weed barrier mat treatment had greater survival than pecan seedlings receiving the herbicide treatment, or those receiving no competition control. A greenhouse experiment examined hardwood seedlings’ response to two-phase flooding/drought treatments to measure the …
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Herbicide resistance in Black-grass (<i>Alopecurus myosuroides</i> Huds.)
Herbicide resistant grass weeds are a growing problem throughout the UK with <i>Alopecurus myosuroides</i> Huds. (black-grass) considered a major problem in winter cereals. Blackgrass control is hindered by the presence of populations resistant to herbicides. Research indicates that resistance in …
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Site Preparation Methods For Restoration Of Non-native Pasturelands To Native Upland Habitat
… for removing non-native pasture grasses. The treatments studied were single herbicide, single disc, multiple herbicide, multiple disc, and single herbicide with two disc treatments. All plots were monitored once a year for three years along non-permanent transects. Percent cover was estimated …
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Agronomic and pest interactions in no-till corn and soybean wih fall versus spring herbicide applications
Fall herbicide applications have increased in popularity in recent years. Little is known of how fall herbicide applications impact soil conditions, insect populations, and winter and summer annual weed populations. Few studies have directly compared fall herbicide applications to early spring …
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Oats as a Companion Crop for Alfalfa: Establishment Methods
… various management practices. Six establishment treatments were imposed: (1) solo-seeded alfalfa raised according to standard procedures recommended for Kentucky, (2) solo-seeded alfalfa with a herbicide treatment, (3) alfalfa seeded with an oat companion crop and treated with a herbicide, (4) …
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Methods for Rapid Screening in Woody Plant Herbicide Development
Methods for woody plant herbicide screening were assayed with the goal of reducing resources and time required to conduct screenings for new products. Past studies have demonstrated reductions in required screening resources (time, amount of herbicide active ingredient, and size of seedlings) can …
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Influence of Several Herbicides on Visual Injury, Leaf Area Index, and Yield of Glyphosate-Tolerant Soybean <I>(Glycine max)</I>
… season has prompted growers to sometimes use herbicides other than glyphosate on glyphosate-tolerant soybean. Field studies were conducted in 1999 and 2000 to investigate potential crop injury from several herbicides on glyphosate-tolerant soybean, and to determine the relationship between …
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Conversion of Exotic Cool-Season Grasslands to Restored Native Plant Communities Utilizing Herbicide Treatments
… sites in eastern South Dakota. Five fall herbicide treatments, two spring herbicide treatments, and an untreated control that received no herbicide or seed addition were applied at each location in fall 2005-spring 2006 and fall 2006-spring 2007. Three fall herbicide treatments and two …
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A Comparison of Vegetation Structure and Composition in Modified and Natural Chaparral
… by brush pile burning and discing. The last herbicide treatment of the area was in 1969 and consisted of a mixture of 2 pounds per acre of 2,4-D and 2,4,5-T, applied by hand spray. Replanting was by range land drill seeding a mixture of intermediate wheat grass and pubescent wheat grass, at a …
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Variable weather and implications for herbicide efficacy and yield loss due to weeds
… was conducted on a database of >3,000 individual herbicide evaluation trials conducted between 1992 and 2019. Chapter 1 of this dissertation is a review of the literature related to climate change and weed interference effects on corn and soybean production. In Chapter 2 we quantified rainfall and …
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Double-crop corn (zea mays) weed control in Virginia
… locations in 1998 and 1999 to determine the herbicide inputs required for double-crop corn production relative to those required in full-season no-till corn production. Experiments were conducted in a split-plot, randomized complete block design with cropping system as the main plot and …
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Physiological and Environmental Basis of Turfgrass and Weed Response to Mesotrione Formulations
Mesotrione is the first triketone herbicide registered for use in turfgrass. Triketones prevent carotenoid biosynthesis by inhibiting the enzyme p-hydroxyphenylpyruvate dioxygenase (HPPD). Although mesotrione controls many species of grass and broadleaf weeds, it is best know for selective control …
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Combination effect of ACP 2100, imazaquin and triclopyr on common dandelion and three Kentucky bluegrass turf types
… but resulted in greater uptake 48 hours after treatment. ACP 2100 also increased triclopyr translocation to the crown, root and middle rosette leaves. In the field and greenhouse, triclopyr did not influence growth regulation and decreased turf injury caused by ACP 2100. Studies showed that as …
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Effects of Low-Input Vegetation Management on Pine-Hardwood Mixed Stands in the Northern Piedmont
… pine and mixed hardwood species. Low-cost herbicide applications (stump treatment, basal stem spray, release, and soil spot release) were used to control competing vegetation during the study. The four even-aged regeneration treatments applied to loblolly pine and mixed hardwood stands of …
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Modeling the interactions of forest cutting and climate change on the hydrology, biomass and biogeochemistry of a northeastern forest
… a devegetation experiment (W2; devegetation and herbicide treatment) and a commercial strip-cut (W4) to confirm the ability of the model to depict ecosystem response to a range of harvesting regimes. In the third phase of dissertation, the confirmed model was used as a heuristic tool to …
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Effects of Rodeo Herbicide on Aquatic Invertebrates and Fathead Minnows
… trends of some waterfowl populations. Rodeo herbicide (glyphosate) may be an effective chemical tool for altering emergent vegetative cover, but little is known about it effects on nontarget organisms such as aquatic invertebrates that are important as a food source for waterfowl. The …
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Effects of Overstory Retention and Understory Vegetation on Small Tree Height Growth in the Inland Northwest
… and understory conditions, with subsequent herbicide treatment of randomly selected plots to create a range of understory competition levels. Research sites were categorized into three site quality classes (Low, Medium, High) based on plant associations, with sites ranging from warm dry …
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Effects of Overstory Retention and Understory Vegetation on Small Tree Height Growth in the Inland Northwest
… and understory conditions, with subsequent herbicide treatment of randomly selected plots to create a range of understory competition levels. Research sites were categorized into three site quality classes (Low, Medium, High) based on plant associations, with sites ranging from warm dry …
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The control of yellow and purple nutsedge (Cyperus esculentus and rotundus) in turfgrass utilizing halosulfuron
… worldwide. In turfgrass, the availability of herbicides that provide selective control of these weeds is limited. To address this problem, a sulfonylurea herbicide, halosulfuron, is being developed for the control of both yellow and purple nutsedge. To confirm preliminary results, evaluations …
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