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Suppl Methods For Biogeochemistry Paper, Jaime Zlamal, Ted K. Raab, Robert A. Edwards, Mark Little, David A. Lipson 2017 San Diego State University

Suppl Methods For Biogeochemistry Paper, Jaime Zlamal, Ted K. Raab, Robert A. Edwards, Mark Little, David A. Lipson

Ted K. Raab

Supplemental Material for Zlamal Raab et al. (2017) Biogeochemistry paper.


Optimizing The Decomposition Of Time Series Using Evolutionary Algorithms: Soil Moisture Analytics, Aniruddha Basak, Ole J. Mengshoel, Chinmay Kulkarni, Kevin Schmidt, Prathi Shastry, Rao Rapeta 2017 Carnegie Mellon University

Optimizing The Decomposition Of Time Series Using Evolutionary Algorithms: Soil Moisture Analytics, Aniruddha Basak, Ole J. Mengshoel, Chinmay Kulkarni, Kevin Schmidt, Prathi Shastry, Rao Rapeta

Ole J Mengshoel

Soil moisture plays a crucial part in earth science, with impact on agriculture, ecology, hydrology, landslides, and water resources. Extremes in soil moisture, which we denote as peaks and valleys, caused by heavy rainfalls and subsequent dry weather, are very important when predicting future soil moisture or even landslides. Existing methods, like moving averages, have limitations when it comes to smoothing time series data while preserving peaks and valleys. In this work, we propose a novel method, HyperSTL, for extrema-preserving smoothing of soil moisture time series. The method optimizes an existing time series decomposition technique, Seasonal Decomposition of Time Series ...


Conservation Farming And Changing Climate: More Beneficial Than Conventional Methods For Degraded Ugandan Soils, Drake N. Mubiru, Jalia Namakula, James Lwasa, Godfrey A. Otim, Joselyn Kashagama, Milly Nakafeero, William Nanyeenya, Mark S. Coyne 2017 National Agricultural Research Organization (NARO), Uganda

Conservation Farming And Changing Climate: More Beneficial Than Conventional Methods For Degraded Ugandan Soils, Drake N. Mubiru, Jalia Namakula, James Lwasa, Godfrey A. Otim, Joselyn Kashagama, Milly Nakafeero, William Nanyeenya, Mark S. Coyne

Plant and Soil Sciences Faculty Publications

The extent of land affected by degradation in Uganda ranges from 20% in relatively flat and vegetation-covered areas to 90% in the eastern and southwestern highlands. Land degradation has adversely affected smallholder agro-ecosystems including direct damage and loss of critical ecosystem services such as agricultural land/soil and biodiversity. This study evaluated the extent of bare grounds in Nakasongola, one of the districts in the Cattle Corridor of Uganda and the yield responses of maize (Zea mays) and common bean (Phaseolus vulgaris L.) to different tillage methods in the district. Bare ground was determined by a supervised multi-band satellite image ...


Simulating Nitrate Drainage Losses From A Walnut Creek Watershed Field, Allah Bakhsh, Jerry L. Hatfield, Ramesh S. Kanwar, Liwang Ma, Lajpat R. Ahuja 2017 Iowa State University

Simulating Nitrate Drainage Losses From A Walnut Creek Watershed Field, Allah Bakhsh, Jerry L. Hatfield, Ramesh S. Kanwar, Liwang Ma, Lajpat R. Ahuja

Rameshwar S. Kanwar

This study was designed to evaluate the improved version of the Root Zone Water Quality Model (RZWQM) using 6 yr (1992–1997) of field-measured data from a field within Walnut Creek watershed located in central Iowa. Measured data included subsurface drainage flows, NO3–N concentrations and loads in subsurface drainage water, and corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] yields. The dominant soil within this field was Webster (fine-loamy, mixed, superactive, mesic Typic Endoaquolls) and cropping system was corn–soybean rotation. The model was calibrated with 1992 data and was validated with 1993 to 1997 data. Simulations ...


The Soil Moisture Velocity Equation, Fred L. Ogden, Craig C. Douglas 2017 University of Wyoming

The Soil Moisture Velocity Equation, Fred L. Ogden, Craig C. Douglas

Fred L. Ogden

Numerical solution of the one-dimensional Richards’ equation is the recommended method for coupling groundwater to the atmosphere through the vadose zone in hyper-resolution Earth system models, but requires fine spatial discretization, is computationally expensive, and may not converge due to mathematical degeneracy or when sharp wetting fronts occur. We transformed the one-dimensional Richards’ equation into a new equation that describes the velocity of moisture content values in an unsaturated soil under the actions of capillarity and gravity. We call this new equation the Soil Moisture Velocity Equation (SMVE). The SMVE consists of two terms: an advection-like term that accounts for ...


The Role Of Herbaceous Woodland Perennial Diversity For Improving Nutrient Uptake Of Riparian Areas, Jan R. Thompson, Catherine Mabry McMullen 2017 Iowa State University

The Role Of Herbaceous Woodland Perennial Diversity For Improving Nutrient Uptake Of Riparian Areas, Jan R. Thompson, Catherine Mabry Mcmullen

Catherine Mabry McMullen

Investigation of disturbed and intact woodlands herbaceous understories provided information on species present, biomass production and nutrient capture in preserved and secondary forests.


Spatial Sampling Strategies With Multiple Scientific Frames Of Reference, Paul B. Reverdy, Thomas F. Shipley, D. E. Koditschek 2017 University of Pennsylvania

Spatial Sampling Strategies With Multiple Scientific Frames Of Reference, Paul B. Reverdy, Thomas F. Shipley, D. E. Koditschek

Departmental Papers (ESE)

We study the spatial sampling strategies employed by field scientists studying aeolian processes, which are geophysical interactions between wind and terrain. As in geophysical field science in general, observations of aeolian processes are made and data gathered by carrying instruments to various locations and then deciding when and where to record a measurement. We focus on this decision-making process. Because sampling is physically laborious and time consuming, scientists often develop sampling plans in advance of deployment, i.e., employ an offline decision-making process. However, because of the unpredictable nature of field conditions, sampling strategies generally have to be updated online ...


Long-Term Tillage And Nitrogen Fertilization Effects On Soil Surface Chemistry, A. Obour, J. D. Holman 2017 Kansas State University

Long-Term Tillage And Nitrogen Fertilization Effects On Soil Surface Chemistry, A. Obour, J. D. Holman

Kansas Agricultural Experiment Station Research Reports

Long-term crop management practices can affect nutrient cycling and availability to crops. This study examined the long-term effects of nitrogen (N) fertilizer application (N rates of 0, 20, 40, and 60 lb N/a) and tillage intensity (conventional tillage (CT), reduced tillage (RT), and no-tillage (NT)) on soil phosphorus (P), micronutrients, and soil acidity in a dryland winter wheat (Triticum aestivum L.)–sorghum (Sorghum bicolor L.)–fallow cropping system. Results showed soil organic matter (SOM), iron (Fe), and zinc (Zn) concentrations were greater under NT compared to CT or RT. Similarly, NT ( 32 ppm) increased P accumulation in the upper ...


Interpretive Geologic Cross Sections Across Lower Platte North Natural Resources District, Nebraska (Ccs-20), Dana Divine 2017 University of Nebraska - Lincoln

Interpretive Geologic Cross Sections Across Lower Platte North Natural Resources District, Nebraska (Ccs-20), Dana Divine

Conservation and Survey Division

No abstract provided.


Some Effects Of Method Of Application Of Fertilizers On Corn And Soils, Frederick B. Smith 2017 Iowa State College

Some Effects Of Method Of Application Of Fertilizers On Corn And Soils, Frederick B. Smith

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

These fertilizer experiments in the greenhouse and field gave the following results:

1. The 2-12-2 and 0-12-2 had a greater effect on the development of both the primary and secondary roots of corn than the 0-12-0.

2. Germination and root growth of corn were retarded when the fertilizers were applied in contact with the seed.

3. The desirable effects of fertilizers on the early growth, maturity and yield of corn appeared to be in proportion to the development of the roots of the plant.

4. The greatest development of both the primary and secondary roots was secured when the fertilizers ...


Influence Of Common Bean (Phaseolus Vulgaris) Grown In Elevated Co2 On Apatite Dissolution, Brian Matthew Morra 2017 University of Maine

Influence Of Common Bean (Phaseolus Vulgaris) Grown In Elevated Co2 On Apatite Dissolution, Brian Matthew Morra

Electronic Theses and Dissertations

Elevated concentrations of atmospheric CO2 brought about by human activity creates changes in plant morphology, growth rate and exudate production. Our study sought to understand the effect of these changes on soil mineral weathering using plants grown under two conditions, ambient CO2 (400ppm) and elevated CO2 (1000ppm). Phaseolus vulgaris (common beans) were grown in flow-through microcosms consisting of a mixture of quartz and apatite sands. Plant growth was sustained by a nutrient solution devoid of calcium (Ca) and phosphorous (P). Using Atomic Adsorption Spectroscopy and colorimetry, Ca and P content of the leachate and plant tissue served ...


Influence Of Prescribed Burning On Upland Soil Properties In Mark Twain National Forest, Southeast Missouri Ozarks, Megan Lynn Hente 2017 Missouri State University

Influence Of Prescribed Burning On Upland Soil Properties In Mark Twain National Forest, Southeast Missouri Ozarks, Megan Lynn Hente

MSU Graduate Theses

In the Mark Twain National forest there is a collaborative effort to restore parts of the forest to its original shortleaf pine-oak woodland areas by using a combination of silviculture and prescribed fire. The purpose of this project is to assess the effects of prescribed burning on upland forest and soil physical properties that influence erosion processes across a gradient of burned sites of different ages and unburned sites. A combination of geospatial, field, laboratory, statistical (one-way ANOVA) and modeling (USLE) methods were used to assess the effects of prescribed burns on forest and soil characteristics in Big Barren Creek ...


Soil Science Lesson Plan For The Cal Poly Learn By Doing Lab, Kelsey Ormonde 2017 California Polytechnic State University, San Luis Obispo

Soil Science Lesson Plan For The Cal Poly Learn By Doing Lab, Kelsey Ormonde

Natural Resources Management and Environmental Sciences

To increase interest in soil science and other related sciences, educational materials need to be tailored to appeal to younger students. The purpose of this project was to create a soil science lesson plan that could be utilized by the Cal Poly Learn By Doing Lab. Information from several articles, textbooks, lesson plans, and websites was reviewed to create a soil science lesson plan for students in 5-8th grade. The lesson plan focused on the three sub-disciplines of soil science; physical, chemical, and biological. Activities were created to correspond to the three sub-disciplines. Alternate activities were created to allow ...


Development Of A Multiband Remote Sensing System For Determination Of Unsaturated Soil Properties, Cyrus D. Garner 2017 University of Arkansas, Fayetteville

Development Of A Multiband Remote Sensing System For Determination Of Unsaturated Soil Properties, Cyrus D. Garner

Theses and Dissertations

A multiband system including active microwave sensing and visible-near infrared reflectance spectroscopy was developed to measure unsaturated soil properties in both field and laboratory environments. Remote measurements of soil volumetric water content (θv), soil water matric potential (ψ), and soil index properties (liquid limit [LL], plastic limit [PL], and clay fraction [CF]) were conducted. Field-based measurement of θv was conducted using a ground-based radar system and field measurements within 10 percentage points of measurements acquired with traditional sampling techniques were obtained. Laboratory-based, visible and near infrared spectroscopy was found to be capable of obtaining empirical, soil specific regression functions (partial ...


Influence Of Algae On Soil Saturated Hydraulic Conductivity: An In Situ Treatment Option For Reducing Infiltration Beneath Unlined Algae Cultivation Ponds, Molly Brianne Pattullo 2017 University of Tennessee, Knoxville

Influence Of Algae On Soil Saturated Hydraulic Conductivity: An In Situ Treatment Option For Reducing Infiltration Beneath Unlined Algae Cultivation Ponds, Molly Brianne Pattullo

Masters Theses

Commercial production of algal biofuels is currently limited by high capital costs, including the cost of installation and maintenance of plastic pond liners, which mitigate seepage of cultivation fluids and control the release of salts and nutrients into the subsurface beneath outdoor algae cultivation ponds. However, studies of animal waste settling lagoons show that underlying soils ranging from sands to clay loams can exhibit reduced hydraulic conductivity within days to weeks after construction, reducing the need for plastic liners. The mechanisms of the hydraulic conductivity reductions, or “soil sealing”, are physical rearrangement of soil particles, buildup of fines, and the ...


Mathematical Model Of The Shell With The Infill For Retaining Structures, Alexander T. Bekker, Nikita Ya. Tsimbelman, Dmitriy A. Potyanikhin, Andrey I. Mamontov, Ömer Bilgin, Tatiana I. Chernova 2017 Far Eastern Federal University

Mathematical Model Of The Shell With The Infill For Retaining Structures, Alexander T. Bekker, Nikita Ya. Tsimbelman, Dmitriy A. Potyanikhin, Andrey I. Mamontov, Ömer Bilgin, Tatiana I. Chernova

Ömer Bilgin

A description of finite element model and analysis of a shell with an infill is performed. A large diameter thin cylindrical shell structure with the edge leaning against compressible foundation soil is analyzed. Different materials are considered individually for the models of each structure shell and infill component (metal or reinforced concrete shell, and granular or elastic infill in a shell and foundation soil loaded by the structure). Contact conditions between 1) the infill and the shell’s inner surface and 2) between the foundation material and the shell edge are analyzed. An example of calculating strain conditions in the ...


A Study Of The Secondary Effects Of Hill Fertilization, Horace J. Harper 2017 Iowa State College

A Study Of The Secondary Effects Of Hill Fertilization, Horace J. Harper

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

A field, laboratory, and greenhouse study of secondary effects of hill fertilization was made using several different soils as follows: Carrington loam, Webster silt loam, Grundy silt loam, Knox silt loam, Marion silt loam, and Buckner coarse sand. The effect of hill fertilization on the root development of the corn plant was also investigated.

Acid phosphate was found to have a more pronounced effect on the hydrogen ion concentration of the soil solution than either ammonium sulfate or potassium chloride. In most cases the first effect of acid phosphate was to increase the acidity of the soil solution. In poorly ...


Relationships Between Hydrogen Ion, Hydroxyl Ion And Salt Concentrations And The Growth Of Seven Soil Molds, Harlan W. Johnson 2017 Iowa State College

Relationships Between Hydrogen Ion, Hydroxyl Ion And Salt Concentrations And The Growth Of Seven Soil Molds, Harlan W. Johnson

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

Comparatively few data have been recorded relative to the effect of hydrogen ion concentration on the development and activities of molds and other fungi, altho such records have been secured for the bacteria. For both groups much more work has been accomplished on the effect of titratable acidity. The importance of molds in transforming plant food in the soil has made advisable the securing of such data. The present paper records the results of a study of the limiting and optimum hydrogen and hydroxyl ion concentrations and the limiting concentrations of several salts as related to the growth of seven ...


The Color Of Soils In Relation To Organic Matter Content, P. E. Brown, A. M. O'Neal 2017 Iowa State College

The Color Of Soils In Relation To Organic Matter Content, P. E. Brown, A. M. O'Neal

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

The color of soils has long been considered to indicate to some extent, at least, their fertility. For centuries farmers in the humid regions have been accustomed to select their land very largely on the basis of color. Dark colored soils have been preferred because experience has shown that such soils are usually more productive than light colored types. But just what the relation is between the color of soils and their fertility or crop-producing power has never been determined. It has been assumed that the organic matter or humus content, which is mainly responsible for the color of soils ...


Catalyzed Synthesis Of Zinc Clays By Prebiotic Central Metabolites, Marcelo I. Guzman, Ruixin Zhou, Kaustuv Basu, Hyman Hartman, Christopher J. Matocha, S. Kelly Sears, Hajatollah Vali 2017 University of Kentucky

Catalyzed Synthesis Of Zinc Clays By Prebiotic Central Metabolites, Marcelo I. Guzman, Ruixin Zhou, Kaustuv Basu, Hyman Hartman, Christopher J. Matocha, S. Kelly Sears, Hajatollah Vali

Chemistry Faculty Publications

How primordial metabolic networks such as the reverse tricarboxylic acid (rTCA) cycle and clay mineral catalysts coevolved remains a mystery in the puzzle to understand the origin of life. While prebiotic reactions from the rTCA cycle were accomplished via photochemistry on semiconductor minerals, the synthesis of clays was demonstrated at low temperature and ambient pressure catalyzed by oxalate. Herein, the crystallization of clay minerals is catalyzed by succinate, an example of a photoproduced intermediate from central metabolism. The experiments connect the synthesis of sauconite, a model for clay minerals, to prebiotic photochemistry. We report the temperature, pH, and concentration dependence ...


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