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 “"Perennial Grasses"”.
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Control of two perennial grasses in southern turfgrasses
… L.) and torpedograss (Panicum repens L.) are perennial grasses that are extremely difficult to remove in established turfgrass. Studies were conducted to determine the potential for controlling these troublesome perennial weeds. Pot studies were conducted for two years to evaluate several …
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Perennial grasses as sustainable bioenergy crops for marginal lands
… 2, the biomass yield and performance of four perennial grass species: Miscanthus x giganteus, big bluestem (Andropogan gerardii Vitman), ‘Kanlow’ switchgrass (Panicum virgatum L.) and four natural populations of prairie cordgrass (Spartina pectinata Link.) were investigated in wet marginal …
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Seasonal changes in quality of three cool season perennial grasses
Call number: LD2668 .T4 1979 M78
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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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Yield and quality of cool-season perennial grasses for forage and biomass feedstocks in Northeast Colorado
… GHG mitigation strategy is the use of long term perennial grass production for bio-fuel use and rangeland restoration. It is estimated that biofuels could offset 30% of current fossil fuel use. Switchgrass, a C4 grass species, was chosen by the DOE as the model crop for cellulosic biofuel because …
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A comparison of canopy evapotranspiration for maize and two perennial grasses identified as potential bioenergy crops
In the Midwestern U.S., perennial rhizomatous grasses (PRGs) are considered one of the most promising vegetation types to be used as a cellulosic feedstock for renewable energy production. The potential widespread use of biomass crops for renewable energy production has sparked numerous …
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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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Effects of Cheatgrass Control on Wyoming Big Sagebrush in Southeastern Utah
… mature to decadent stands of sagebrush with few perennial grasses and forbs. Sagebrush seedlings and perennial grasses compete for limited resources with annual grasses and forbs. To determine the affects of cheatgrass control on sagebrush growth and reproductive characteristics, imazapic …
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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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The effects of herbivory, competition, and disturbance on island meadows
… forbs have declined relative to non-native grasses and I tested the facilitatory role of herbivory in that degradation. My investigations, novel to the field, were conducted on islands spanning the Canada-US border. Islands served as natural experimental units in a mensurative study of …
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A Comparative Analysis of the Nutrient Composition and Digestibility of California Perennial and Annual Grasses at Four Stages of Growth
… beef cattle, of common California annual and perennial grasses: wild oats (<em>Avena barbata </em>and <em>Avena fatua</em>)<em>, </em>soft chess (<em>Bromus hordeaceous</em>)<em>,</em> filaree<em> </em>(<em>Erodium botrys</em>)<em>,</em> Italian ryegrass<em> </em>(<em>Lolium multiflorum</em>), …
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SEED PRODUCTION OF MIXED PRAIRIE IN GRASSLANDS NATIONAL PARK, SASKATCHEWAN
… dominant seed producing species. Seed yield from perennial grasses was greatest in the slope and lowland community in 1994. Seed density of perennial grasses was greatest at mid-season of 1994 in the slope and lowland, and in mid season of 1995 in the upland. Seed yield of perennial forbs did not …
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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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An assessment of the impact of landscape soil, government programs and crop insurance on the profitability of perennial grass cropping systems grown for bioenergy
… and seek to maximize utility. Results show that perennial grasses grown for bioenergy have a higher relative profitability on flooded Belknap soils and Armstrong and Armster eroded upland soils versus Putnam soil which is non-eroded and upland, that government support increases profitability of …
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Responses of Above- and Belowground Forb and Plant Species Diversity to Grazing Exclusion and Fire in the Northern Great Basin Sagebrush Steppe
… to an overall decrease in native deep-rooted perennial bunch grasses and forbs, an increase in annual invasive grasses, and greater sagebrush dominance. Although not as widely used as perennial bunchgrasses, forbs of the Intermountain west have also been tested for use in rehabilitation …
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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
… were higher in rotations with 3 years of either perennial grass. Soil moisture tended to be the highest at depths 30 - 60 cm in the 3-year tall fescue rotation in August and September 2007. Cotton in 2006 and peanut in 2007 had higher growth and yield where the annual crop directly followed a …
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Construction and analysis of the miscanthus genespace
Miscanthus and energy cane are closely related perennial grasses and candidate bioenergy crops. Both genomes create a challenge for variant discovery and genotyping because of their abundant repeats and the presence of a genome scale duplication with little subsequent divergence. In addition, the …
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Sugar, biomass and biofuel potential of temperate by tropical maize crosses
… C4 pathway for photosynthesis, which include the perennial grasses, miscanthus (Miscanthus x giganteus) and switchgrass (Panicum virgatum L.), maize (Zea mays L.), sugarcane (Saccharum spp.), and sorghum (Sorghum bicolor L. Moench). These plants exhibit the highest potential for biofuel production …
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Perennial energy crops on riparian buffers affect nitrogen cycling microbial communities
Production of perennial bioenergy crops on farmland that is suboptimal for food crops has been suggested for ecosystem services such as mitigating greenhouse gas emissions and reducing nutrient loss while producing sustainable bioenergy feedstocks. Even though we understand the relationship between …
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