Theses and Dissertations - Department of Soil & Crop Sciences
Recent Submissions
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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 ... -
Impacts of conservation tillage on water quality and soil health characteristics under furrow irrigation
Furrow irrigation-induced sediment and nutrient loss continues to be a serious problem in the Western States of the US. Sediment and nutrients in runoff can eventually be discharged into streams and rivers impairing water ... -
Genomic and phenomic tools to aid in the utilization of Eastern European and Central Asian wheat germplasm in U.S. hard winter wheat breeding
To view the abstract, please see the full text of the document. -
Effects of agricultural management on greenhouse gas emissions, carbon and nitrogen sequestration, and DAYCENT simulation accuracy
Agricultural activities affect greenhouse gases (GHGs) sources and sinks in terrestrial ecosystems. Organic fertilizer provides nitrogen (N) and organic carbon (C) to soil, resulting in enhanced N and C substrates for ... -
Phenotypic changes and DNA methylation status in cryopreserved seeds of rye (Secale cereale L.)
Conserving genetic diversity is one of the major tasks for seed banks worldwide. At present, there are two long-term preservation methods in the USDA-ARS National Laboratory of Genetic Resources Preservation (NLGRP)：storage ... -
Influence of outdoor light on biomass, nitrogen, and phytohormone concentrations of a nitrogen-fixing Anabaena sp. Cyanobacterium, The
To view the abstract, please see the full text of the document. -
Remote sensing and apparent electrical conductivity to characterize soil water content
Improvement in water use efficiency of crops is a key component in addressing the increasing global water demand. The time and depth of the soil water monitoring are essential when defining the amount of water to be applied ...
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