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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 38 for “"perennial grass"”.
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Study of agronomic factors important to the establishment of various perennial grass bioenergy feedstock species
Perennial grasses are expected to comprise a substantial portion of the lignocellulosic biomass to meet renewable energy mandates in the U.S. in the next decade. Miscanthus x giganteus, a high-yielding warm-season, perennial, rhizomatous grass that has been grown for cellulosic biomass production, …
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The effect of perennial grass species on forage growth and quality, etiolated growth, animal performance and economics
… conducted during 2005 and 2006 to evaluate five perennial grass species for forage yield and quality, steer performance and grazing capacity, animal intake, plant energy reserves and economic return under grazed conditions. In 1999, two 0.8 ha replicates each of ‘Paddock’ meadow bromegrass …
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Nitrogen fertilization, yield components, and species selection of perennial grass bioenergy cropping systems across eastern North America
Perennial grasses are being studied as a fuel source and potential replacement for fossil fuels. Perennial grasses are a versatile group of potential bioenergy crops that have the ability to produce large yields on relatively low-quality land or with lower inputs than traditional annual row crops …
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Perennial Grass Based Crop Rotations in Virginia: Effects on Soil Quality, Disease Incidence, and Cotton and Peanut Growth
… included 2 or 3 years of tall fescue or orchardgrass grown as high-value hay crops. Each crop rotation was evaluated for changes in soil quality indicators including soil carbon and nitrogen, water stable soil aggregates, plant available water content, bulk density, cone index values, and soil …
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Phenotypic Plasticity within the Native Perennial Grass, Poa secunda (Sandberg bluegrass), an Important Component of the Western United States Sagebrush Grassland Vegetation
… Basin are experiencing a rapid shift from native perennial grasses to invasive annual grasses. The ability to respond to competition through root plasticity may be an important trait for survival of native plants in invaded systems. I investigated the following questions about Poa secunda, a …
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An assessment of the impact of landscape soil, government programs and crop insurance on the profitability of perennial grass cropping systems grown for bioenergy
… supply of cellulosic material. Miscanthus, switchgrass, or a native prairie mix are posed to meet that supply. This study analyzes the profitability of those three cropping systems when grown for bioenergy relative to corn and soybeans. It uses a stochastic budgeting model with actual grain …
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The Role and Contribution of Saprotrophic Fungi during Standing Litter Decomposition of Two Perennial Grass Species, <i>Schizachyrium scoparium</i> and <i>Schizachyrium tenerum</i>
… our current understanding of fungal processes in grasslands, which should be incorporated into existing models depicting major biogeochemical pathways.</p>
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Spring-Thaw Nitrous Oxide Emissions From Reed Canarygrass On Wet Marginal Soil In New York State
… the impact of conversion of long-term fallow grassland to perennial grass bioenergy crops on N2O emissions during spring-thaw, and to identify field-scale features that influence emissions. We measured mid-afternoon fluxes daily from March 27th to April 7th 2013 from fallow and reed …
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The effect of resource dynamics on invasive annual and native perennial grasses in grasslands of the mid-north of South Australia / Tanja Lenz.
… growth and interactions between invasive annual grasses and native perennial grasses in the mid-north of South Australia. At most sites annual grass abundance was positively correlated with rainfall, soil moisture after rainfall and higher soil productivity. Perennial grass abundance was …
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Exploiting the Productivity of C4 Photosynthesis in Cool Temperate Climates: Mechanisms and Thresholds of Cold Tolerance in Miscanthus, Saccharum, and Spartina pectinata
Perennial grasses that use the C4 photosynthetic pathway are the best choice for terrestrial bioenergy and can help mitigate climate change. Much of the marginal land available for bioenergy occurs in cool temperate climates at high latitudes. To be productive in cool temperate climates, C4 …
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MODELING IMPACTS OF CLIMATE CHANGE AND AGRICULTURAL MANAGEMENT ON WATERSHED OUTPUTS IN MIDWESTERN USA
… late in the 21st century. Planting more switchgrass, on the other hand, results in less water in the streams and water quality improvements relative to the baseline. For all given agricultural landscapes simulated, all flow, sediment and nutrient outputs increase from early-to-late century …
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The population genetics of Festuca rubra on park grass
… <i>Festuca rubra</i>, a clonal/sexual species of perennial grass. Populations are identified that have experienced contrasting histories of change over the past 138 years, and within which the ratios of clonally to sexually derived individuals have been determined. From these ratios the selection …
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Response of Pinyon-juniper woodlands to fire, chaining, and hand thinning
… explained 86.5% of the deviance in cheatgrass (Bromus tectorum) cover at the treated plots. The projects on soils derived from welded tuff had very little cheatgrass while soils derived from limestone or mixed limestone/volcanics were dominated by cheatgrass. Parent material should be …
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Stochastic dynamic optimization approach for revegetation of reclaimed mine soils under uncertain weather regime
… subject to an uncertain weather regime. A perennial grass growth model was modified and validated for predicting vegetation growth in reclaimed mine soils. The plant growth model is based on continuous relationships between plant growth, air temperature, day length, leaf area, photoperiod …
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Conversion of Switchgrass into Functional Carbon Materials and Food Emulsifiers
Switchgrass is a perennial grass native to North America. It can easily grow in a variety of conditions with a high yield. In recent years, it has gained increasing attention as a feedstock for biofuel production. However, the process is limited due to the high-cost and immature technologies. …
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The Effects of Phosphorus and Nitrogen Fertilization on Tall Fescue Nutrient Content, Yield and Baleage Quality
… (Festuca arundinacea Schreb.) is a cool season perennial grass commonly used in year-round forage production systems. Producers often wrap large round bales of tall fescue in plastic. The fermented product of this practice, termed baleage, allows the forage to be stored for later feeding. During …
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Development of prairie cordgrass (spartina pectinata link) as a dedicated bioenergy crop
Development of perennial-grass bioenergy crops relies on investigating the genetic resources, understanding the physiology, and optimizing the agronomic practices related to biomass production. As one of the dominant native grass species (Poaceae), prairie cordgrass (Spartina pectinata Link) showed …
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Agro-Climatic And Land Suitability Mapping For Switchgrass Grown As A Bioenergy Crop In North Dakota
<p>Switchgrass (Panicum virgatum L), a native warm-season perennial grass, grows in Central and North American tall-grass prairie. The plant is immense biomass producer and can reach heights up to three meters or more in wet areas. Its high lignocellulosic content makes switchgrass an appropriate …
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ESTABLISHMENT AND GROWTH OF ANNUAL AND PERENNIAL GRASSES ON COPPER MINE TAILING SLOPES (ARIZONA).
… 1981 to study the establishment of annual and perennial grasses on the slopes of copper mine tailing ponds. In 1980, the north and south slope exposures were hydroseeded with barley (Hordeum vulgare L.). Plots were capped with topsoil prior to planting or left uncapped, and mulched with wheat …
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Plant root contributions to the carbon balance of a changing agricultural Midwest
… 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 agriculture, I measured root …
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