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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 77 for “"Plant Uptake"”.
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Numerical Modeling for the Solute Uptake from Groundwater by Plants-Plant Uptake Package
… transport in groundwater coupled to sorption by plant roots, translocation into plant stems, and finally evapotranspiration. The conceptual model takes into account both Root Concentration Factor, RCF, and Transpiration Stream Concentration Factor, TSCF for chemicals which are a function of Kow. …
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Fate of ¹⁵N-depleted fertilizer N in a corn-rye cropping sequence: plant uptake and soil distribution
… fertilizer N applied to corn (Zea mays L.) at planting followed by a winter rye (Secale cereale L.) cover crop treatment. The research was divided into four studies. The first study was conducted to evaluate an analytical procedure that could be used for the diffusion of low masses of …
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Influence of Phytase and High Available Phosphorous Corn Diets on Solubility and Plant Uptake of P, Cu, and Zn in Poultry Manure and Manure-Amended Soils
… phosphorous corn diets on the solubility and plant uptake of P, Cu, and Zn in poultry manure and soils amended with manure. Five diet treatments were used in the study: 1) normal phytic acid corn and 0.135% inorganic P (NPA), 2) normal phytic acid corn, 600 units phytase, and 0.135% inorganic …
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Direct Transpiration and Naphthalene Uptake Rates for a Hybrid Poplar Based Phytoremediation System
Direct transpiration rates and plant uptake of naphthalene by a hybrid poplar phytoremediation system located in Oneida, Tennessee were determined using hydrologic and groundwater concentration data. Water table recession analysis techniques were employed to determine direct transpiration rates …
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The role of denitrification in the nitrogen cycle of New England salt marshes
… tracer was used to study competition between plants and nitrifying bacteria for remineralized ammonium. In undisturbed sediments of Spartina alterniflora, plant uptake out-competed nitrification-denitrification, with plant uptake accounting for 66% of remineralized ammonium during the growing …
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Vegetative Potential to Reduce Total Dissolved Solid Nutrient Ions Generated from Reclaimed Mine Lands in Central Appalachia
… (used as proxies for evapotranspiration and plant uptake) were characterized at each site and correlated with log ratios of common TDS contributing ions [i.e., base cations Ca2+, Mg2+, Na+, K+ (RBC), sulfate (RSO42-), and total Ca2+, Mg2+, Na+, K+, SO42- (Rtotal)] between un-vegetated and …
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Evaluation of agricultural beneficial management practices: Cattle access restriction to surface waters subsurface tile drainage management
… nitrogen loads in groundwater, in tile flow, in plants, in soil and denitrification were compared between treatments. Nitrogen was mostly removed from managed tile drainage fields through plant uptake. Compared to nitrogen plant uptake, denitrification, the second greatest nitrogen removing …
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Impacts of microbial activity on trace metal behavior during the bioremediation of phenanthrene-contaminated soils
… of exchange between solution and solid phase and plant uptake of the more labile and mobile, and potentially more bioavailable metal species. Phenanthrene removal by P. frequentans was optimised in terms of both soil water and nutrient composition. Slightly lower removal rates were obtained using …
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Soil drying and re-wetting effects on phosphorus availability and plant yields
… at soil water potentials (SWPs) that can support plant growth, thereby increasing crop P use efficiency and yields, experiments at different scales aimed to evaluate P release and plant uptake. Laboratory studies using three low-P UK soils determined that available P (sodium bicarbonate …
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Removal of Wastewater Nitrogen and Phosphorus by an Oligohaline Marsh
… MD. Tidal flushing, nutrient distributions, plant uptake, and sediment burial were examined as removal mechanisms. This marsh seems to be little affected by, and has a small impact on wastewater. Wastewater flow can raise mean water levels by 3 cm in addition to seasonal changes of 30 cm …
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Modeling the interactions of forest cutting and climate change on the hydrology, biomass and biogeochemistry of a northeastern forest
… from major pools, including mineralization and plant uptake, were poorly predicted. </p> <p>The overall goal of this dissertation was to develop a simulation tool to evaluate short and long-term effects of harvesting on the hydrology and biogeochemistry of the northern forest. In the first phase …
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The Chemical Forms and Plant Availability of Copper in Composting Organic Wastes
… occurred in forms not immediately available for plant uptake. However, composting processes enabled the release of this copper which then, over time, became more bioavailable. Large amounts of copper in the copper amended materials were initially detectable in all fractions except the residual …
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A computer simulation model for investigating the effect of land application of sludge on runoff water quality
… losses of N by volatilization, denitrification, plant uptake, leaching, and overland flow. Data required by CREAMS-NT includes runoff volume, sediment yield, percolation, and soil environmental conditions which is generated by the hydrologic and erosion components of the original CREAMS model. …
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Seasonal responses of carbon, nitrogen, and phosphorus cycling to woodland reduction and different organic matter additions in the semiarid Great Basin
… nutrients or render them available for plant uptake. The stochastic nature of resource availability in drylands may cause these ecosystems to be particularly susceptible to disturbance. We used two common fuel reduction treatments - mastication and cut-and-lop - in piñon-juniper …
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Development of a continuous, physically-based distributed parameter, nonpoint source model
… infiltration equation. Soil evaporation and plant transpiration were modeled separately using the Ritchie equation. If soil moisture exceeds field capacity, the model computes percolation based on the degree of soil saturation. Nutrient losses include nitrate, sediment-bound and dissolved …
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Enhanced petroleum-contaminated soil bioremediation by plants
… bacteria to the irrigation water. The two plants were selected to represent extremely different species in terms of transpiration potential and root density in order to better understand the mechanisms involved in phytoremediation. Clay sandy soil (3: 1, by weight) was spiked with Fuel oil …
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Abrasive grit application for integrated weed and nitrogen management in organic vegetable cropping systems
… to determine the nitrogen mineralization and plant uptake of different organic fertilizers used as abrasive grits. Five abrasive grit treatments (walnut shell grits, soybean meal fertilizer, Suståne© composted turkey litter fertilizer, a weedy control, and a weed-free control), two application …
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Effect of land application of fluidized-bed combustion residue on soil and plant characteristics of reclaimed surface-mined pastures, performance and mineral status of grazing steers and nutrient balance by sheep fed the forage
… increased soil pH similarly, and reduced plant uptake of Fe, Zn, Mn, and Ni similarly. Calcium concentration increased in forages by both amendments, Mg increased with limestone and S with FBCR application. Cell wall components decreased, while ash and lignin increased with both …
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Evaluation of GLEAMS considering parameter uncertainty
… exceptions may indicate errors in the runoff and plant uptake components of the model. Neither procedure made relative predictions correctly all the time, however subjective assessment of the model results led to consistent decisions between the two procedures. The probabilistic procedure reduced …
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