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 61 for “"Plant Productivity"”.
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The role of genotypic diversity in stabilizing plant productivity in variable environments
… Turnip yellows virus. Findings from research on plant phenotypic traits involved in competition and compensation in A. thaliana, were translated into the crop plant winter barley in field experiments. Mixtures achieved high and stable yields despite being subjected to multiple abiotic and biotic …
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Plant productivity and diversity in coastal wetlands in Mississippi – impact of hydrological extremes
… openings in Louisiana, US, affected vegetation productivity and diversity in salt marshes on the neighboring Mississippi Gulf Coast, US. My study area is two estuarine systems that differ in their proximity to the Bonnet Carré Spillway, elevation, and salinity including Hancock County Marshes on …
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Understanding changes in plant productivity using EVI satellite data in Tswalu Kalahari Reserve
… limited availability of water strongly affects plant productivity, but other key drivers of vegetation dynamics, such as herbivory and fire, are usually considered to have a relatively minor impact. The main purpose of this study was to characterise the spatial and temporal pattern in plant …
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Manufacturing performance : a comparative study of engine plant productivity in the automotive industry
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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MORPHO-PHYSIOLOGICAL FACTORS AFFECTING PLANT PRODUCTIVITY IN BUSH AND VINE FORMS OF WINTER SQUASH (CUCURBITA MAXIMA DUCH)
<p>The productivity of a new bush winter squash cultivar ('Autumn Pride') was compared to that of 'Blue Hubbard', a high-yielding vine cultivar. Yields of 'Autumn Pride' increased with increasing plant density and, at high plant densities, were greater than yields of 'Blue Hubbard' at its near …
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Tea (Camellia sinensis (L.) O. Kuntze) plant productivity and protection with microbial stimulants : A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
… identified from soil and leaf samples from a tea plantation in New Zealand and used for biopromotion bioassays on young tea plants grown under glasshouse conditions. Indigenous Hypocrea lixii provided the most significant biostimulation, than its exogenous anamorph; T. harzianum, which was tested …
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Interactive effects of climate change and management on grassland greenhouse gas emissions
… of the effects on GHG emissions by changing plant productivity (either above and/or below-ground) and plant-soil properties. Plant species composition also plays a key role affecting the nutrient cycling thus GHG emissions in grasslands. The aim of this thesis is to understand how grassland …
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Sub-Antarctic plant-soil interactions in a changing world: plant N acquisition and growth under warming on Marion Island
… soil decomposition processes result in N-limited plant productivity and soils replete in organic N (oN, e.g., amino acids) but not inorganic N (iN, i.e., NH4 + and NO3 - ). Recent advances in our understanding of plant N use have shown that cold ecosystem plants meet the bulk of their N …
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Essays on the Returns to Higher Education
… chapter, "Does Human Capital Spillover Beyond Plant Boundaries?: Evidence from Korea" explores a social return to human capital by examining the magnitude of human capital externalities on plant productivity. Human capital externalities exist if plants in a region with a high level of human …
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Electrode length measurement in electric arc furnaces
… in decreased maintenance time, and improved plant productivity. This thesis describes the development of a microwave-based Soderberg electrode length-measurement system. Various methods of electrode-length measurement were investigated, and it was found that a microwave measurement system …
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Quantifying the Responses of Vegetation to Environmental Stresses
I examined interactions between plants and the environment they live in along the soil-plant-atmospheric continuum and addressed the effects of drought and acid deposition on plant water use. Using a novel stable isotope technique, I showed that plant water source utilization can be modulated in …
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Divergent Phenotypic Recurrent Selection for Nitrate Reductase Activity and Correlated Responses in Maize
… seedling and post anthesis NRA of individual plants; the NRA and plant productivity of S1 progeny from high and low NRA plants; the effect of supplementary nitrogen fertilization on yield and plant constituents of the composites selected for high and low NRA and the accuracy with which …
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Detection and Capture of Nitrogen Fixing Bacteria From Soil and Roots Using Plant Specific Lectins
<p>Diazotrophs increase plant productivity by providing ammonia directly to plants in the rhizosphere or through association with the roots (Sun et al., 2021). Leveraging diazotrophs can aid in the reduction or application of harmful synthetic nitrogen fertilizers. This thesis aims to use plant …
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Direct Amino Acid Uptake by Plants related to Grassland Diversity - methodological and ecological Investigations
Uptake of intact amino acids by plants has been identified as an alternative nitrogen (N) source for plants in a number of ecosystems and soil types. Up to now it is assumed that this uptake strategy is of particular relevance in ecosystems with low mineral N (Nmin) contents due to insignificant …
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Nitrogen uptake patterns by snow addition in a sub-Arctic dry heath tundra ecosystem
… and investigated their implications for plant water availability and nitrogen cycling processes. Through snow fence experiments and 15N isotope labelling and simulations of carbon fluxes with the CoupModel, I found that a longer growing season positively impacted plant productivity, …
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Dynamics and Characterization of Soil Organic Matter on Mine Soils 16 Years after Amendment with Topsoil, Sawdust, and Sewage Sludge
… effects of these key soil quality variables on plant productivity, and (iii) to determine the comparative ability of trees and herbaceous plants to persist and to conserve or maintain mine soil quality. In 1982, a mined site was amended with seven different surface treatments: a fertilized …
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Soil-plant-herbivore interactions and nutrient dynamics in semi-arid grazing systems in northeastern Brazil and western USA
… disturbances and interactions between soil, plants, and herbivores influence nutrient cycling, productivity, and ecosystem structure in semi-arid grazing systems in northeastern Brazil and Colorado, USA. We found that the presence of tree species within pastures of C. ciliaris in northeastern …
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Scheduling in two-machine robotic cell : an optimal algorithm based on buffering
… and efficient approaches for improving plant productivity are cellular manufacturing and robotics. The proliferation of robot technology is an outcome of increasing industrial automation especially in engineering and electronics. Robots offer substantial gains in manufacturing …
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Interactive effects of elevated carbon dioxide concentration with nutrient availability and leaf development on plant carbon metabolism
… and respiratory CO2 release influence plant growth, crop yields, and the ability of terrestrial ecosystems to offset ~2-3 Gt CO2 yr -1 of anthropogenic emissions. Rising atmospheric CO2 concentration ([CO2]) this century will impact plant photosynthesis and respiration with consequences …
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