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.
Results
Showing 1 to 20 of 31 for “"nitrogen fertilizers"”.
-
Response of cool-season turfgrass to foliar applied and stabilized nitrogen fertilizers
… objective was to assess whether stabilized N fertilizers offered a benefit over unamended sources under field conditions. Experiments to address these objectives were carried out at the Landscape Horticulture Research Center in Urbana, IL. The results indicate that approximately 7-34% of …
-
Environmental considerations for interactions between agricultural herbicides and nitrogen fertilizers in water
Agricultural herbicides and fertilizers are widely used and necessary for the production of food and feed. Each herbicide and fertilizer must be extensively researched prior to being released for commercial use. However, some research indicates that an interaction may occur when fertilizers and …
-
Hydrolysis of formamide and volatilization of ammonia from nitrogen fertilizers added to soils
… on NH(,3) volatilization from various N fertilizers applied to soils (134 mg N/chamber) under laboratory conditions showed that high amounts of NH(,3) were lost in 12 days from urea (33 to 40%) and formamide (31 to 36%) when surface applied to acid and calcareous soils. Ammonia …
-
Impacts of enhanced efficiency nitrogen fertilizers on yield-scaled N2O emissions in Illinois maize
… to assess the ability of enhanced efficiency nitrogen fertilizers (EENFs) to minimize yield-scaled N2O emissions while maintaining nutrient utilization and crop productivity of maize. In addition to an unfertilized control (zero N), N source treatments applied at 202 kg ha-1 at planting …
-
Ammonia Volatilization and Urease Activity in Turf
… soil had an acidic pH. Eight different nitrogen fertilizers were evaluated for NH(,3)-N losses after application to turf. The rate and mode of urea application as well as the effects of thatch were also assessed for their effects on NH(,3) volatilization.
-
The Effects of Rootstock Selection and Carbon-based Fertility Amendments on Apple Orchard Productivity and Soil Community Ecology
… productivity. Many apple growers apply synthetic nitrogen fertilizers to improve fruit yield and quality. In excess of tree requirements, nitrogen fertilizers may reduce crop yield and quality, as well as contribute to water pollution. The addition of carbon-based amendments, such as yardwaste, …
-
Urea as an Effective Nitrogen Source for Cyanobacteria
… with urea now accounting for > 50% of nitrogen fertilizer applications worldwide. The shift from inorganic nitrogen fertilizers to urea-based sources has coincided with the reappearance of cyanobacteria blooms in freshwaters. Here, we examined urea as a nitrogen source for three …
-
Detection and Capture of Nitrogen Fixing Bacteria From Soil and Roots Using Plant Specific Lectins
… reduction or application of harmful synthetic nitrogen fertilizers. This thesis aims to use plant root proteins, or lectins, to more rapidly recover viable diazotrophs that are likely to associate with crops. In this study, lectins, are used to recover bacteria from bulk soil by taking …
-
Groundwater contamination by selenium, nitrate, coliform bacteria, and volatile organic compounds in the Las Vegas Valley, Nevada, shallow aquifer zone
… irrigation as a result of the application of nitrogen fertilizers to lawns. Chloroform is formed by the chlorination of municipal water supplies and can persist in shallow groundwater, serving as a tracer for secondary recharge of groundwater by irrigation water.
-
Time of fruit bud formation in strawberry plants as influenced by varying ratios of nitrogen
… conclusions were reached: 1. The application of nitrogen, in any amounts, made immediately following planting does not produce any noticeable effect on the time of fruit bud differentiation in the strawberry. 2. Nitrogen fertilizers applied to strawberry plants shortly after planting hasten the …
-
Gene Expression Profiling of the nip Mutant in Medicago truncatula
The study of root nodule symbiosis between nitrogen-fixing bacteria and leguminous plant species is important because of the ability to supplement fixed nitrogen fertilizers and increase plant growth in poor soils. Our group has isolated a mutant called nip in the model legume Medicago truncatula …
-
Numerical modeling of agricultural tile drainage water quality with health considerations
Nitrogen fertilizers are an anthropogenic source of potential human and environmental health concerns. Variable rate fertilizer application technologies utilized by production agriculture increase the complexity of interactions with the natural environment, notably water quality originating from …
-
Investigating Rhizobium Leguminosarum Metabolism and Rhizosphere Colonization Using High-Throughput Genomics and Erythritol Enrichments
… to increase the yield of legume crops by fixing nitrogen in nodules on legume roots; this reduces the use of costly and environmentally harmful nitrogen fertilizers. Erythritol is exudated from legume roots, and is catabolized by Rhizobiaceae genera. The goal of the thesis is to explore how …
-
Genetic Analysis of Nitrogen Remobilization and Kernel Compositon in Zea Mays L. and Sorghum Bicolor (L.) Moench
<p>Genetic Analysis of Nitrogen Remobilization and Kernel Composition in Zea Mays L. and Sorghum Bicolor (L.) Moench. Major Professor: Mitchell Tuinstra. Modern maize (Zea mays L.) production relies heavily on nitrogen fertilization for high productivity. Over-application of nitrogen fertilizers in …
-
Development of a Model for the Kinetics and Mechanism of Nitrogenase
<p>Nitrogenase has a central role in the global nitrogen cycle as the enzyme that catalyzes the reduction of atmospheric N2 to NH3. Fixed nitrogen is generally limiting in the environment and in agriculture, so nitrogenase has received much attention as an alternative to nitrogen fertilizers. …
-
Comprehensive evaluation of cow dung digestate composition for potential soil fertilization: Advanced analytical techniques
… offers a sustainable alternative to synthetic fertilizers, aligning with the United Nations Sustainable Development Goals (SDGs), particularly Goal 2 (Zero Hunger) and Goal 13 (Climate Action). This study aims to evaluate the physicochemical composition, nutrient bioavailability, and agronomic …
-
Physiological, Metabolic, and Transcriptional Analysis of Submergence Tolerance in Rice and Nitrogen Use Efficiency in Wheat
… that rice plants promote rapid carbohydrate and nitrogen remobilization and transport in mature leaves, supporting quick elongation growth of growing leaves. In the presence of SUB1A, these metabolic processes were suppressed in mature leaves, resulting in the avoidance of energy starvation in …
-
Nitrogen partitioning, content and efficiency in hybrid canola
… produced in Saskatchewan every year. Farmers use nitrogen fertilizer supply so that canola crops reach their yield potential. Canola, like corn, is a crop that is know for high nitrogen fertilization requirements. A two year study was conducted at three locations across Saskatchewan with the main …
-
Valutazione dei meccanismi di degradazione dei nitrati durante il processo di infiltrazione e trasporto nelle acque sotterranee come verifica della efficacia delle misure di mitigazione della contaminazione nelle Zone Vulnerabili da Nitrati
… animals has led to the widespread application of fertilizers in soils. This practice has resulted in the release of various chemical pollutants into the soil, which are then transported into the water table through the leaching action of rainwater. Despite the implementation of strict regulations …
Page 1 of 2