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 103 for “"n uptake"”.
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Assessing interactions between nutrients and toxicity : influences of nitrogen and phosphorus on triclosan toxicity to the aquatic macrophyte "lemna gibba".
… endpoints such as elemental stoichiometry and uptake were also differentially affected according to nutrient – triclosan treatments. In particular, tissue-N inhibition was more pronounced that tissue-P leading to N:P dose-response trends, which were most sensitive in P-limited exposure media. …
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The influence of cultivar and environment on the relationship between flour protein content and grain yield in wheat
… and protein content. The grain N yield and N uptake increased with each increment of N level. The N harvest index (NHI), however, decreased with increasing N level. Biological yield at maturity increased with increasing N application but the 'response of HI to N level' was hyperbolic. Higher …
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Stress-induced alterations in ecosystem function: the role of acidification in lotic metabolism and biogeochemistry
… metric <i>q</i>CO₂) and biomass-specific N uptake (i.e. <i>q</i>N) with increasing acidity. The positive relationship between <i>q</i>CO₂ and <i>q</i>N indicated alternate fates for N other than structural biomass, possibly related to increased exoenzyme production as part of the stress …
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Unraveling an uncertain future for the Great Basin: how climate, grass invasion, and wildfire interact to drive ecosystem function
… influence some of the key factors driving N uptake by plants and soil microbes after fire. Plant N uptake exhibited a non-monotonic relationship with burn severity, where sites that burned severely had suppressed N uptake for up to two years following fire. Dry conditions muted plant and …
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Plant nitrogen availability in selected Virginia soils
… Plant available N was measured by N uptake of successive wheat crops grown in the greenhouse. Multiple linear regression models for different groups of samples were used to determine the contribution of the different soil N fractions to the plant available N supply, and to predict N …
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Optimizing soil and fertilizer nitrogen use by intensively managed soft red winter wheat
… on the amounts and patterns of the crop N uptake. Dry matter production and total N concentration were measured in total above ground plant material at different growth stages, as well as in leaves, stems, and spikes. Plant N uptake was affected by the climatic conditions in the different …
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The Marine Cyanate Cycle
… we lacked a suitable tracer for measuring uptake. I developed a cyanate assay to measure cyanate concentrations in estuarine and seawater samples, and then measured distribution at sites in the coastal western temperate North Atlantic (NA) and eastern tropical South Pacific (ETSP) including …
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Nitrogen cycling in tall fescue turf with added clippings
… applications as test plots. For both studies, N uptake generally showed a linear response to total N applied. Clipping-N produced roughly the same amount of growth and N uptake as the fertilizer-N, even as the rate of N uptake varied with time. In both studies, soil nitrate levels remained low …
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Nitrogen Management and the Effects of Compost Tea on Organic Irish Potato and Sweet Corn
… crops and application of soil amendments on N uptake and crop yield of organic Irish potato (Solanum tuberosum) and sweet corn (Zea mays). Cover crops were crimson clover (Trifolium incarnatum) and forage radish (Raphanus sativus). Soil amendments included in-row application of commercially …
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Development of intensive nitrogen management strategies for winter barley (Hordeum vulgare L) in the mid-Atlantic region
… and develop predictors of optimum N rates. An uptake study was conducted to determine N uptake of winter barley with respect to growth stage. Various N rate combinations at growth stages (GS) 25 and GS 30 were evaluated over twenty locations and three cropping seasons, to determine the …
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The response of symbiotic performance, growth and yield of chickpea (Cicer arietinum L. ) genotypes to phosphorus fertilizer rates and rhizobial inoculation
… ACC#2. In addition, ACC#5 had the highest soil N-uptake in both seasons followed by ACC#3, while ACC#1 had the least value of soil N-uptake in both seasons. Phosphorus fertilizer application increased the fixation of N by 36.8% (P≤0.01), and similarly in soil N-uptake by difference of 59.9% …
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Impact of free-living diazotrophs, Azospirillum lipoferum and Gluconacetobacter azotocaptans, on growth and nitrogen utilization by wheat (Triticum aestivum cv. Lillian)
… an increase in dry matter, N2-fixation and N uptake; 4) determine if fertilizer N applied at three levels influences atmospheric N2-fixation by A. lipoferum or G. azotocaptans; 5) determine if inoculation of wheat with A. lipoferum or G. azotocaptans under field conditions causes any increase …
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Determination of Poultry Litter's Nitrogen-Fertilizer Value for Winter Wheat Production
… to calculate PAN. Tiller number, aboveground N uptake, and grain yield responses to UASB-N were characterized using linear and quadratic models. Soil amended with PL or urea was incubated at 5, 15, and 25°C to supplement field research results. Wheat receiving PL-N produced N uptake and yields …
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Winter Barley as a Commodity Cover Crop in the Mid-Atlantic Coastal Plain and Evaluation of Soft Red Winter Wheat Nitrogen Use Efficiency by Genotype, and its Prediction of Nitrogen Use Efficiency through Canopy Spectral Reflectance in the Eastern US
… (Hordeum vulgare L.) plant biomass (PB), plant N uptake (PNU), grain yield, residual soil nitrate (RSN), and ammonium (RSA). In general, at winter dormancy, SIM resulted in increased PB and PNU but not RSN or RSA. At cover crop termination; SIM and the No fall N practices increased PNU, and at …
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Use of Stable Isotopes to Trace the Fate of Applied Nitrogen in Forest Plantations to Evaluate Fertilizer Efficiency and Ecosystem Impacts
… losses (see Chapter 2); 2) evaluate temporal N uptake patterns of loblolly pine (see Chapter 3); and 3) evaluate fertilizer N cycling and partitioning in a loblolly pine ecosystem (see Chapter 4). Chapter 2 results showed enhanced efficiency fertilizers (EEFs) significantly reduced ammonia (NH3) …
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The role of crop residue and nitrogen in the corn-soybean rotation effect
… on yield and other parameters associated with N uptake and utilization, we found no consistent interaction between crop residue and N form that would help to manage continuous corn and soybean to overcome the lack of rotation effect. (Abstract shortened by UMI.)
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Interannual Differences in Nutrient Dynamics During a Brown Tide Bloom (<i>Aureococcus anophagefferens</i>) and the Interaction of <i>A. anophagefferens</i> with Heterotrophic Bacteria
… interannual differences in nitrogen and carbon uptake and concentrations of dissolved constituents were compared at two sites, one in Maryland and the other in Virginia. Overall, I observed an increase in bloom intensity and duration over time. No single nitrogen compound was responsible for …
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Optimizing yield and crop nitrogen response characterization by integrating spectral reflectance and agronomic properties in sugarcane and rice
… have the potential for predicting biomass N uptake were red and red-edge based simple ratio and normalized difference vegetation index. Varietal effect on the models for estimating biomass and N uptake was significant only when red-based vegetation indices were used (p<0.05). Addition of …
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Effect of Liquid Manure on Corn and Soybean Growth, Nitrogen Uptake, and Yields
… inorganic N on corn and soybean growth, N uptake, and yield.
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Response of cool-season turfgrass to foliar applied and stabilized nitrogen fertilizers
… of my work was to determine factors that affect uptake of N by cool-season turfgrasses. Experiments were conducted to determine the quantity of foliar-applied N that is absorbed by turfgrass leaves, ways to optimize the process, and whether other common management practices can affect foliar N …
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