Theses and Dissertations - Department of Soil & Crop Sciences
Recent Submissions
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Soil organic matter as a nitrogen source for Brassica napus
Decreasing nitrogen (N) fertilizer losses from agricultural systems is a major focus in sustainable agriculture research. Most research to date has focused on reducing and managing N fertilizer additions in time and space. ... -
Characterization and molecular mapping of stripe rust resistance in a Denali/Hatcher winter wheat doubled haploid population
The majority of global wheat (Triticum aestivum L.) production is subject to infection by the stripe rust pathogen (Puccinia striiformis Westend. f. sp. tritici Erikss.). The evolution of new stripe rust races appears to ... -
Repurposing agricultural and municipal wastes to supply soil with plant-available phosphorus
Inorganic phosphorus (P) is a finite resource used to develop fertilizers, heavily applied in agricultural systems, necessary to maintain global crop yields that satisfy global food security needs. In addition to concerns ... -
Effects of Management-intensive Grazing in relation to soil health and forage production in an irrigated perennial pasture system
Interest in Management-intensive Grazing (MiG) on irrigated, perennial, cool-season pasture has increased steadily in Colorado due to pressure to reduce public lands grazing, overall declining space available for pasture, ... -
Reuse of oil and gas produced water for irrigation of spring wheat (Triticum aestivum L.): plant physiological and immune system response
Water resources for agricultural irrigation in the semiarid western United States are challenged due to increased oil and gas (O&G) activity and increasing water scarcity. Produced water (PW) generated from the O&G industry ... -
Effect of tillage on soil physical properties and crop production
The objective of this study was to determine the effect of two tillage systems -- conventional tillage (CT) and reduced tillage (RT) -- for a three-year corn-corn-watermelon rotation on: 1) biological production of corn ... -
Crop residue: a hero's journey from biomass to soil carbon in eastern Colorado dryland crop rotation systems
Crop residues play a vital role in reducing the potential for wind erosion of agricultural soils in arid and semi-arid regions. The residues act via three modes: reducing wind speed, acting as a physical impediment to wind ... -
Factors contributing to maize and bean yield gaps in Central America vary with site and agroecological context
In Central America, the population and associated food demands are rising rapidly, while yields of their staple crops, maize and beans, remain low in a global context. To identify the main limiting factors to crop production ... -
Analysis of land use change and greenhouse gas emissions in Kalasin Province, Thailand
Growing global population causes many stresses on the environment, perhaps the most serious is global warming due to Greenhouse Gas (GHG) emissions. Major contributors to GHG emissions include agricultural production and ... -
Comprehensive microbiome analysis of wheat and its wild relatives, A
Microbiomes are diverse assemblages of endophytic and free-living microorganisms that can confer competitive advantages to their plant hosts such as water acquisition, nutrient mobilization, drought tolerance, salt tolerance, ... -
Integrated assessment of agricultural ecosystems using simulation-optimization and machine learning
Agriculture provides many ecosystem services to human society but is also a major cause of environmental degradation. The key challenge of modern agricultural production is to meet projected increases in global demands for ... -
Genetic diversity of ACC-deaminase positive bacteria in Colorado soil under winter wheat cultivars (Triticum aestivum L.)
ACC-deaminase positive bacteria (ACC+) promote plant growth and development by lowering abiotic stress ethylene levels through deamination of 1-aminocyclopropane-1-carboxylic acid (ACC), the immediate precursor of ethylene. ... -
Nitrogen mineralization from biofertlizer Azolla mexicana compared to traditional organic fertilizers
Organic agriculture has become an essential approach to meeting the growing global food production demand and long-term soil sustainability, as well as addressing environmental problems connected with the use of synthetic ... -
Effect of organic nitrogen fertilizer source, application method, and application rate on ammonia volatilization from drip irrigated vegetables
To view the abstract, please see the full text of the document. -
Intensification revolution in dryland cropping systems: implications from field to landscape scale, The
A global transformation in semi-arid cropping systems is occurring as dryland (non-irrigated) farmers shift from crop rotations reliant on year-long periods of bare fallow to more intensively cropped systems. Bare fallow ... -
Amendment effects on soil physical properties and restoration of decommissioned forest roads
Unsealed forest roads, including logging roads and unauthorized roads created by hunters, miners, and recreational users, generate significant harmful effects to local ecosystems and waterways. Rapid restoration of these ... -
Azolla biofertilizer growth and utilization for vegetable production
To view the abstract, please see the full text of the document. -
Weathering and soil properties on catenary sequences in forest and alpine ecosystems of the central Rocky Mountains
The evolution of soil landscapes can be evaluated by studying soil properties along catenary sequences—soil sequences that are hydrologically and topographically connected along hillslopes from higher elevation to lower ... -
Evaluation of spring wheat genotypic response to soil health promoting management practices
Growing efforts to restore soil organic matter and overall soil health are likely to enhance soil biological communities and promote positive interactions between plants and soil communities. However, modern genotypes bred ... -
Dairy farm phosphorus recovery and re-use to reduce water quality risk and improve phosphorus cycling in agriculture
Phosphorus (P) is a limited natural resource, and its efficient use and cycling are important for the long-term sustainability of agricultural and industrial production. The over-application of P in dairy wastewater to ...
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