Soil Science Commons^™

Soil Moisture Recognition And The Spatial Distribution Of Storm Activity In The Mojave Desert Using High-Resolution Aster And Modis Imagery For Thermophysical Mapping, Russell J. Skuse

UNLV Theses, Dissertations, Professional Papers, and Capstones

Climate models suggest that the Mojave Desert ecoregion is vulnerable to becoming drier in the future, and as the human population grows and development increases, environmental stresses will likely increase. Determining the spatial distribution and variation of soil moisture on a regional scale is an essential component to climate change, hydrologic, and habitat analyses. Soil permeability and sediment stability are characteristics that have been shown to be measurable from remote sensing observations. The primary objective of this project is to map the mechanical composition of the surface materials in the Mojave Desert ecoregion with implications for soil permeability, sediment stability, …

Initial Elastic Modulus Degradation Using Pressuremeter And Standard Penetration Test Results At Two Sites, Dustin Robbins

UNLV Theses, Dissertations, Professional Papers, and Capstones

In-situ testing was performed at two sites consisting of pre-bored pressuremeter testing, seismic surface wave testing to develop a shear wave velocity profile, and Standard Penetration testing during the soil boring phase in order to evaluate the feasibility of using large shallow foundations for a project. This study focuses on a comparison of the in-situ direct measurements of soil stiffness obtained from this testing program. The small strain modulus obtained from the seismic surface wave test results is compared to the intermediate strain modulus obtained from both the initial loading pressuremeter modulus and reload pressuremeter modulus. The modulus calculated from …

Subsurface Stratigraphy And Characterization Of Mississippian (Osagean To Meramecian) Carbonate Reservoirs Of The Northern Anadarko Shelf, North-Central Oklahoma, Brett Robert Wittman

Graduate Theses and Dissertations

Mississippian carbonate strata of the midcontinent contain prolific oil and gas reservoirs. Production from these carbonates has been primarily from two reservoir types, the Mississippi "chat" and recently denser chert-rich mudstone intervals. The"chat" interval is a high porosity chert residuum associated with the both the Osagean and basal Pennsylvanian unconformity. The distribution of the "chat" reservoir is discontinuous and heterogeneous. Recent horizontal drilling successes have reinvigorated academic and industry interest in the Lower Mississippian. Much of the activity is now targeting lower porosity, cherty, mudstone intervals of the Reeds Spring and Cowley Formations, which were previously considered to be non-economic. …

Adaptation Of Regional Representative Soil Project And Soil Judging For Cameroon, Celestine Che

All Dissertations

Representative regional soils have agricultural, cultural, economic, environmental, and historical importance to Cameroon. Twenty seven regional representative soils have been identified in Cameroon. A set of laboratory exercises, assignments and exam questions have been developed utilizing the Regional Representative Soil Project (RRSP) that gives students an opportunity to practice interpretation of soil series descriptions, taxonomic classes, soil forming factors, and soil physical and chemical properties. The RRSP can be further enhanced and complemented with Soil Judging. Conventional soil judging as practiced in the United States has been adapted for Cameroon by a graduate student from that country using an undergraduate-level …

Chemical Characterization And Anion Exchange Properties Of A West Tennessee Loess Soil, Jessica Lynn Ottinger

Masters Theses

Loess soils of west Tennessee may potentially contain large amounts of subsoil metal oxides (Fe, Al, and Mn) which may retain and restrict the movement of conservative anions, such as nitrate (NO₃). The potential utilization of large quantities of flue gas desulfurization (FGD) gypsum on these soils may displace subsoil NO₃, releasing it to adversely impact sensitive aquatic environments. This research examines the depth distribution of Fe-, Al, and Mn-oxyhydroxides, pH, particle size distribution, and of the cation and anion exchange capacity and exchange phase composition to identify depths that have the greatest potential for anion …

Adsorption Of Antimony By Birnessite And The Impact Of Antimony On The Electrostatic Surface Properties Of Variable-Charge Soil Minerals, Kalyn Alaine Vergeer

Masters Theses

Antimony (Sb) is a toxin that can be found in high concentrations in the soil due to anthropogenic sources. Antimony exists in soil as Sb(V) in the monovalent antimonate hydroxyanion. The adsorption mechanisms of Sb(V) are not well-characterized. The objective of this study was to further elucidate Sb(V) adsorption mechanisms by examining the impact of adsorption on surface charging characteristics of gibbsite, goethite, birnessite, and kaolinite. Also examined was Sb(V), SO₄ [sulfate], and PO₄ [phosphate] adsorption by birnessite. Electrophoretic mobility and potentiometric titrations were employed to examine the ζ-potential [zeta-potential] and net proton surface charge density as a …

Arsenic Mobilization And Iron Transformations During Sulfidization Of As(V)-Bearing Jarosite, Scott Johnston, Edward Burton, Annabelle Keene, Britta Planer-Friedrich, Andreas Voegelin, Mark Blackford, Greg Lumpkin

Associate Professor Edward D Burton

Jarosite (KFe3(SO4) 2(OH)6) is an important host-phase for As in acid mine drainage (AMD) environments and coastal acid sulfate soils (CASS). In AMD and CASS wetlands, jarosite may encounter S(−II) produced by sulfate reducing bacteria. Here, we examine abiotic sulfidization of As(V)-bearing K-jarosite at pH 4.0, 5.0, 6.5 and 8.0. We quantify the mobilization and speciation of As and identify corresponding Fe mineral transformations. Sulfide-promoted dissolution of jarosite caused release of co-precipitated As and the majority of mobilized As was re-partitioned to a readily exchangeable surface complex (AsEx). In general, maximum As mobilization occurred in the highly sulfidized end-members of …

Ltreb: Biogeochemical Mechanisms Of Response In The Third Decade Of Whole-Ecosystem Experimental Manipulations At The Bear Brook Watershed In Maine (Bbwm), Ivan J. Fernandez, Stephen A. Norton, Lindsey E. Rustad

University of Maine Office of Research Administration: Grant Reports

This grant will support the Bear Brook Watershed in Maine (BBWM) where research has been conducted for approximately 20 years on the effects of atmospheric sulfur and nitrogen deposition on forests. The research is conducted on two watersheds, each drained by a first order stream. One is treated bimonthly by helicopter to simulate atmospheric deposition of sulfur and nitrogen. Over the past 20 years, this research has identified and verified key factors governing forest response to air pollution, and also revealed major gaps in our understanding that are critical to determining the success of current and potential future regulations under …

Researching Soil Hydrogen Dynamics In Subarctic Sweden, Victoria Lynn Ward

Inquiry Journal 2013

No abstract provided.

Adsorption Of Hexavalent Chromium On Hydrous Manganese Oxide, Andrew K. Macleod

Masters Theses

Hexavalent chromium is a very common contaminant most often associated with industrial processes, it is quite mobile in the subsurface and a better understanding of its mobility and interactions with soil constituents will help ongoing remediation efforts.

Hydrous manganese oxides (HMO) are a very common soil constituent and thus would be likely to interact with Cr(VI) in contaminated shallow subsurface environments. The goal of this study is to develop a working model that can improve predictions of Cr(VI) mobility in natural systems. A diffuse double layer surface complexation model (DLM) was developed by deriving reaction stoichiometries and stability constants for …

Preliminary Groundwater Level Changes At Selected Sites In Nebraska Following The Drought Of 2012, Aaron R. Young, Mark E. Burbach, Leslie M. Howard

Conservation and Survey Division

No abstract provided.

Alluvial Sediment Or Playas: What Is The Dominant Source Of Sand And Silt In Desert Soil Vesicular A Horizons, Southwest Usa, Mark R. Sweeney, Eric V. Mcdonald, Christohper E. Markley

All Faculty Scholarship for the College of the Sciences

Vesicular A (Av) soil horizons form beneath desert pavements from the accretion of aeolian sediment (dust) commonly thought to be derived primarily from desiccating pluvial lakes and playas, with contributions from ephemeral washes and alluvial fans. Particle size distributions of Av horizons are typically bimodal with primary modes of very fine silt and fine sand, suggesting that the horizon matrix is derived from multiple sources. Here we conduct detailed chemical and physical analysis of both Av horizon soil samples and potential sources of aeolian sediment to better constrain the relative contributions of dust associated with the development of Av horizons. …

Clay Synthesis: Modeling The Uptake Of Potassium During Low Temperature Illitization Of Smectite, Peter M. Razumov, Lucy C. Taylor, Rebecca A. Pickering

Georgia State Undergraduate Research Conference

No abstract provided.

Determination Of The Cec In Srs Soils And The Capability Of Epa Model 9081 For Cec Of Acidic Soils, Alexandra M. Simpson

Georgia State Undergraduate Research Conference

No abstract provided.

Map-Based Probabilistic Infinite Slope Analysis Of The Stephens Creek Watershed, Portland, Oregon, Ryan Andrew Cole

Dissertations and Theses

The Stephens Creek Watershed in southwest Portland, Oregon was chosen by the city as a pilot project for urban stream restoration efforts, and the infiltration of stormwater was identified as a potential restoration strategy. The Stephens Creek Watershed has historically been known to be unstable during high precipitation events (Burns, 1996), and the need to address the response of slope stability to anthropogenically-driven changing groundwater conditions is the focus of this study. Airborne light detection and ranging (LiDAR) and geotechnical data from the City of Portland were employed to create a high resolution (0.84 m2) physics-based probabilistic slope stability model …

Soil Groups Of Western Australia: A Simple Guide To The Main Soils Of Western Australia (4th Edn), Noel R. Schoknecht, Shahab Pathan

Resource management technical reports

This publication provides a simple, standardised and easy-to-understand way to recognise the most common soils in Western Australia.

It is designed to:

1) Provide a standard way of giving common names to the main soils of the State;

2) Provide a simple method to identify them;

3) Assist with the communication of soils information at a general level.

A Review Of The Broome Sandstone Aquifer In The La Grange Area, Robert J. Paul, Richard J. George Dr, Peter Gardiner

Resource management technical reports

Land use in the West Kimberley near Broome, Western Australia, is dominated by cattle grazing on pastoral stations, dispersed mining activity and tourism. Irrigated agriculture has developed but is at a small scale. There is interest from pastoralists and horticultural companies to expand irrigated agriculture, and pastoral diversification and mosaic irrigation systems have been proposed. However, if irrigated agriculture is to expand, it must be viable and meet community and regulatory requirements. Developing secure and sustainable water resources is critical

This review is focussed on the La Grange groundwater subareas (La Grange area). Its purpose is to summarise the existing …

Arsenic In The Soils Of Northwest Oregon, Tracy Ryan Ricker

Dissertations and Theses

One hundred and eighty-six soil samples from Northwest Oregon were tested for arsenic content. The highest values measured were 13.9 ppm in the A horizon (site C4) and 20.4 ppm in the B horizon (Site P4). Arsenic was not detected in 28 A horizon samples and 23 B horizon samples. Data are grouped based on the age and rock type of underlying bedrock. Lithologic groups with six or more data points were compared statistically to ascertain if groups are distinct. Analysis of Variance (ANOVA) multiple comparison tests indicate that the arsenic content of the Marine Sediments and Sedimentary Rocks group …

Photo Highlights From The 33rd Kentucky Alfalfa Conference, Krista Cotton

Kentucky Alfalfa and Stored Forage Conference

No abstract provided.

Finishing Beef On Alfalfa, Todd Powell

Kentucky Alfalfa and Stored Forage Conference

Powell Farms started in 1996 with 15 acres of Alfalfa hay intended for cow/calf feed. A neighbor and his friends bought every bale that year. Over the next 14 years the only alfalfa hay our cows got to eat was when a cutting got wet and was rolled. As with any business when the economy starts to take a downward trend, it is wise to start looking for new and innovative ways to market your product.