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 45 for “"row crops"”.
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Monitoring and management of thrips populations in vegetables, row crops, and greenhouse crops in Virginia
Thrips are pests in a variety of crops and are responsible for millions of dollars in damage worldwide. In Virginia there are a few key thrips species that cause a large portion of damage to both vegetable and floricultural crops. Three prominent pests include Frankliniella tritici (Fitch), …
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Row crop environments provide an all-you-can-eat buffet and pesticide exposure to foraging honey bees
… For example, agricultural landscapes, such as a row crop system, are necessary for our food production, but they may cause poor nutrition in bees from a lack of available nectar and pollen. Row crops are largely wind or self-pollinated, and while previous studies have focused on the impact of …
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Avian breeding ecology in soybean fields: does no-till provide any benefits?
… the Midwest is in agriculture production, with row crops being the most prevalent. Most row crops have replaced grasslands, resulting in declines of their constituent bird communities. Previous research has shown that tillage regimes can affect the suitability of row crop fields as wildlife …
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Examining surface energy and moisture balance changes associated with land conversion from annual to perennial biofuel crops
Population growth and shifts in the global economy are creating greater demand for food, fiber, and fuel. These demands are driving land use changes (LUC) associated with expanding food production and the search for renewable energy. Second-generation cellulosic biofuel feedstocks are being pursued …
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Summer and Fall Ecology of Gray Patridge in Eastern South Dakota
… nests (91%) were in grassy roadsides and fencerows. Few birds nested in cover dominated by legume vegetation. Average clutch size of completed nests was 17.8 eggs and nest success was 37%. Mammalian predation was the major cause (50%) of nesting failure. Gray partridge habitat utilization was …
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Evolution in the Cornbelt : how a few special species are adapting to industrial agriculture
… What was once the prairie is now the Corn Belt-row crops planted from fencerow to fencerow. What does this mean for the native wildlife, which evolved for millions of years to live only on the prairie? Here are the stories of three species-cliff swallows, western corn rootworms, and prairie deer …
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Growing crops for biofuel and forage while conserving soil and water
… objectives were to: a) assess the impacts of growing WSG on water storage, soil physical and hydraulic properties, soil organic carbon (SOC) dynamics, and water and wind erosion as compared with row crops, b) assess the impacts of growing WSG on biomass and forage production and quality and c) …
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Winter and Spring Ecology of Gray Partridge in East Central South Dakota
… pasture in a year with deep snow (56 cm) and row crops in a year with less snow (4 cm). Partridge may have been able to locate food more easily in a pasture than in a stubble field in a year with deep snow. In early spring during dispersal, pair formation, and selection of nesting territories, …
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Wild Turkey Ecology in Two Intensively Farmed Landscapes in Central Illinois
… followed by riparian forest and rural grassland. Row crops, winter wheat, urban grassland, and other/unknown were the least preferred land uses for turkey hens during all periods. Modeling of range size revealed that while many factors interacted to determine annual range size, within seasons hens …
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Winter/Spring Population Characteristics of White-Tailed Deer in an Agricultural/Wetland Complex in Northeastern South Dakota
… using an adaptive kernel method. Agricultural crops (i.e., corn [Zea mays], row crops other than corn [e.g., soybeans [Glycine max]], small grains [e. g., wheat [Triticum aestivum]], and alfalfa [Medicago sativa]) were generally preferred in winter within the 95% home range; whereas, treebelts …
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Using GIS and Land Use Data to Select Candidate Reference Sites for Stream Bioassessment
… as percentages of forest, urban, pasture, row crops, and barren area for both the entire catchment and for 10, 40, and 130-m riparian buffers, road and impoundment density and stream/road crossings. Sites were then ranked by land use impairment, with the least impaired selected as candidate …
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Status and breeding ecology of the loggerhead shrike in Virginia
… and pasture, and larger fields and area of row crops, may partially explain the decline in Virginia. Changes in the intensity, phenology, or placement of cattle gazing can result in lowered shrike productivity and may have also contributed to the decline. Further studies of shrike …
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Evaluation of life cycle assessment methodology for multiple agroecosystems
Industrialized agricultural production of annual row crops, such as corn and soybeans, is a major contributor to several environmental problems, including climate change and eutrophication of waterways. Land use transition to multifunctional woody polyculture (MWP) agroecosystems has been proposed …
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The Influence of Switchgrass Establishment on Soil Organic Matter Pools in an Agricultural Landscape
… particularly carbon and nitrogen. Conventional row-crop agriculture accelerates the decomposition of soil organic matter, contributing to atmospheric carbon and declining soil fertility. Planting perennial warm season grasses is a useful management alternative to row crop agriculture because …
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Spring Migration Ecology of American Woodcock (Scolopax minor) in the Central Management Region of the United States
… were detected had less agriculture (specifically row crops) and more hardwood cover, especially where tree cover was 70%-80%, than present in the study area. Survey areas where woodcock were detected also had higher patch size coefficients of variance that indicates large ranges of patch sizes and …
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Evaluating cover crops and herbicides for horseweed and Palmer amaranth management
… common weeds in Kansas that compete against many row crops. Horseweed can emerge in different seasons depending on the year. Palmer amaranth emerges from spring throughout the summer months and has a rapid growth rate with higher temperatures. Three separate studies were conducted near Manhattan, …
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A comparison of canopy evapotranspiration for maize and two perennial grasses identified as potential bioenergy crops
… The potential widespread use of biomass crops for renewable energy production has sparked numerous environmental concerns, including the impacts of land-use change on the hydrologic cycle. We predicted that total seasonal evapotranspiration (ET) would be higher for PRGs relative to maize …
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Plant root contributions to the carbon balance of a changing agricultural Midwest
… in root C inputs associated with a change from row crops to high-yielding perennial grasses (Miscanthus × giganteus and Panicum virgatum), and the taxonomic partitioning of vertical niche space in a restored prairie. To determine the effect of climate change on soil C in conventional row crop …
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Status and Distribution of Franklin's and Richardson's Ground Squirrels in Eastern South Dakota
… to convert remaining grassland habitat into row crops. Obligate grassland mammal species such as the Richardson’s ground squirrel (Urocitellus richardsonii) and Franklin’s ground squirrel (Poliocitellus franklinii) have suffered declines in abundance and distribution throughout their range …
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Integration of Herbicide Programs with Cultural and Mechanical Practices for Managing Glyphosate-Resistant Palmer amaranth (Amaranthus palmeri) in Soybean (Glycine max)
… is the most troublesome weed in Arkansas row crops, causing producers to rely heavily on multiple mechanisms of action to reduce selection pressure for further evolution of herbicide resistance and to successfully produce a profitable crop. It is critical for the sustainability of weed …
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