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Impacts Of 4r Nitrogen Management On Drainage Water Quality, Matthew J. Helmers 2018 Iowa State University

Impacts Of 4r Nitrogen Management On Drainage Water Quality, Matthew J. Helmers

Matthew J. Helmers

Much of the U.S. Corn Belt is characterized by relative flat, poorly-drained areas which with extensive subsurface drainage, have become some of the most valuable and productive agricultural land in the world. However, this is not without consequences. Nitrate-N loss from these systems is of particular concern due to its potential adverse impacts on both public health and ecosystem function. In addition to the potential local impacts on receiving waters in the Corn Belt, nitrogen loads from the region are suspected as a primary contributor to hypoxia in the Gulf of Mexico. For nearly 30 years Iowa State University ...


Drainage Design For Improved Profits And Water Quality, Matthew J. Helmers, Greg Brenneman 2018 Iowa State University

Drainage Design For Improved Profits And Water Quality, Matthew J. Helmers, Greg Brenneman

Matthew J. Helmers

Subsurface drainage systems are an important component of agricultural production systems in many areas of Iowa. However, these drainage systems have been shown to deliver nitrate-N to downstream waterbodies. So, while subsurface drainage is important for crop production we also need to consider the design of these systems to minimize nitrate-N loss. Use of drainage water management in the design and operation of subsurface drainage systems is one potential method to reduce nitrate-N loss.


Modeling The Impacts Of Climate Change On Nitrogen Losses And Crop Yield In A Subsurface Drained Field, Zhaozhi Wang, Qhiming Qi, Lulin Xue, Melissa Bukovsky, Matthew J. Helmers 2018 McGill University

Modeling The Impacts Of Climate Change On Nitrogen Losses And Crop Yield In A Subsurface Drained Field, Zhaozhi Wang, Qhiming Qi, Lulin Xue, Melissa Bukovsky, Matthew J. Helmers

Matthew J. Helmers

The effect of climate change on crop production and nitrate-nitrogen (NO3-N) pollution from subsurface drained fields is of a great concern. Using the calibrated and validated RZWQM2 (coupled with CERES-Maize and CROPGRO in DSSAT), the potential effects of climate change and elevated atmospheric CO2 concentrations (CO2) on tile drainage volume, NO3-N losses, and crop production were assessed integrally for the first time for a corn-soybean rotation cropping system near Gilmore City, Iowa. RZWQM2 simulated results under 20-year observed historical weather data (1990–2009) and ambient CO2 were compared to those under 20-year projected future meteorological data (2045–2064) and elevated ...


Electrical Stimulation For Enhanced Denitrification In Woodchip Bioreactors: Opportunities And Challenges, J. Y. Law, Michelle L. Soupir, D. Raj Raman, T. B. Moorman, Say K. Ong 2018 Iowa State University

Electrical Stimulation For Enhanced Denitrification In Woodchip Bioreactors: Opportunities And Challenges, J. Y. Law, Michelle L. Soupir, D. Raj Raman, T. B. Moorman, Say K. Ong

D. Raj Raman

Woodchip bioreactors are being implemented for the removal of nitrates in groundwater and tile water drainage. However, low nitrate removals in denitrifying woodchip bioreactors have been observed for short hydraulic retention time (HRT) and low water temperature (°C). One potential approach to improve woodchip bioreactor performance is to provide an alternative and readily available electron source to the denitrifying microorganisms through electrical stimulation. Previous work has demonstrated the capability of bio-electrochemical reactors (BER) to remove a variety of water contaminants, including nitrate, in the presence of a soluble carbon source. The objective of this study was to evaluate the denitrification ...


Simulation Of Daily Flow Pathways, Tile-Drain Nitrate Concentrations, And Soil-Nitrogen Dynamics Using Swat, Michelle L. Soupir, Matthew J. Helmers, William G. Crumpton, Jeffrey G. Arnold, Philip W. Gassman 2018 Iowa State University

Simulation Of Daily Flow Pathways, Tile-Drain Nitrate Concentrations, And Soil-Nitrogen Dynamics Using Swat, Michelle L. Soupir, Matthew J. Helmers, William G. Crumpton, Jeffrey G. Arnold, Philip W. Gassman

Michelle L. Soupir

Tile drainage significantly alters flow and nutrient pathways and reliable simulation at this scale is needed for effective planning of nutrient reduction strategies. The Soil and Water Assessment Tool (SWAT) has been widely utilized for prediction of flow and nutrient loads, but few applications have evaluated the model's ability to simulate pathway-specific flow components or nitrate-nitrogen (NO3-N) concentrations in tile-drained watersheds at the daily time step. The objectives of this study were to develop and calibrate SWAT models for small, tile-drained watersheds, evaluate model performance for simulation of flow components and NO3-N concentration at daily intervals, and evaluate simulated ...


Electrical Stimulation For Enhanced Denitrification In Woodchip Bioreactors: Opportunities And Challenges, J. Y. Law, Michelle L. Soupir, D. Raj Raman, T. B. Moorman, Say K. Ong 2018 Iowa State University

Electrical Stimulation For Enhanced Denitrification In Woodchip Bioreactors: Opportunities And Challenges, J. Y. Law, Michelle L. Soupir, D. Raj Raman, T. B. Moorman, Say K. Ong

Michelle L. Soupir

Woodchip bioreactors are being implemented for the removal of nitrates in groundwater and tile water drainage. However, low nitrate removals in denitrifying woodchip bioreactors have been observed for short hydraulic retention time (HRT) and low water temperature (°C). One potential approach to improve woodchip bioreactor performance is to provide an alternative and readily available electron source to the denitrifying microorganisms through electrical stimulation. Previous work has demonstrated the capability of bio-electrochemical reactors (BER) to remove a variety of water contaminants, including nitrate, in the presence of a soluble carbon source. The objective of this study was to evaluate the denitrification ...


Near Shore Beach Volume Modeling Approach For Setting Beach Bacteria Tmdls: A Case Study, Hickory Grove Lake, Iowa, Rohith D. Gali, Michelle L. Soupir 2018 Iowa State University

Near Shore Beach Volume Modeling Approach For Setting Beach Bacteria Tmdls: A Case Study, Hickory Grove Lake, Iowa, Rohith D. Gali, Michelle L. Soupir

Michelle L. Soupir

A novel approach to set bacteria Total Maximum Daily Load (TMDL) using a Near-Shore Beach Volume (NSBV) model was described along with recommendations for design of a monitoring network to support this method. Sources of fecal bacteria in the Hickory Grove Lake watershed include unpermitted septic systems, manure applications in the watershed, livestock access to streams, waterfowl, and wildlife. The Lake Inlet, Lake Outlet, and Lake Beach were monitored for E. coli concentrations from 2010-2012, this monitoring data was used to assess relationships between watershed bacteria loads and the beach bacteria levels. Fecal bacteria from waterfowl were identified as the ...


Variation In Angler Distribution And Catch Rates Of Stocked Rainbow Trout In A Small Reservoir, Brian S. Harmon, Dustin R. Martin, Christopher J . Chizinski, K. L. Pope 2018 University of Nebraska-Lincoln

Variation In Angler Distribution And Catch Rates Of Stocked Rainbow Trout In A Small Reservoir, Brian S. Harmon, Dustin R. Martin, Christopher J . Chizinski, K. L. Pope

Nebraska Cooperative Fish & Wildlife Research Unit -- Staff Publications

We investigated the spatial and temporal relationship of catch rates and angler party location for two days following a publicly announced put-and-take stocking of rainbow trout (Oncorhynchus mykiss). Catch rates declined with time since stocking and distance from stocking. We hypothesized that opportunity for high catch rates would cause anglers to fish near the stocking location and disperse with time, however distance between angler parties and stocking was highly variable at any given time. Spatially explicit differences in catch rates can affect fishing quality. Further research could investigate the variation between angler distribution and fish distribution within a waterbody.


Population Characteristics Of Shovelnose Sturgeon During Low- And High-Water Conditions In The Lower Platte River, Nebraska, Jeremy J. Hammen, Martin J. Hamel, Matthew L. Rugg, Edward J. Peters, Mark A. Pegg 2018 U.S. Fish and Wildlife Service, Columbia, MO

Population Characteristics Of Shovelnose Sturgeon During Low- And High-Water Conditions In The Lower Platte River, Nebraska, Jeremy J. Hammen, Martin J. Hamel, Matthew L. Rugg, Edward J. Peters, Mark A. Pegg

Nebraska Cooperative Fish & Wildlife Research Unit -- Staff Publications

Cycles of low- and high-water periods (i.e., years) in river systems are natural occurrences, but understanding how cyclical climatological patterns affect fishes, especially long-lived species, is unclear. We assessed Shovelnose Sturgeon population dynamics between a period of low- (2001-2004) and high- (2009-2012) water years in the lower Platte River, Nebraska. Low-flow periods in the lower Platte River can cause disconnection(s) between upstream and downstream reaches resulting in isolated pools and elevated water temperatures leading to stressful situations for aquatic life and possible mortality. Our data show no measurable differences between key population indices between flow condition periods which ...


Electrical Stimulation For Enhanced Denitrification In Woodchip Bioreactors: Opportunities And Challenges, J. Y. Law, Michelle L. Soupir, D. Raj Raman, T. B. Moorman, Say K. Ong 2018 Iowa State University

Electrical Stimulation For Enhanced Denitrification In Woodchip Bioreactors: Opportunities And Challenges, J. Y. Law, Michelle L. Soupir, D. Raj Raman, T. B. Moorman, Say K. Ong

Agricultural and Biosystems Engineering Publications

Woodchip bioreactors are being implemented for the removal of nitrates in groundwater and tile water drainage. However, low nitrate removals in denitrifying woodchip bioreactors have been observed for short hydraulic retention time (HRT) and low water temperature (°C). One potential approach to improve woodchip bioreactor performance is to provide an alternative and readily available electron source to the denitrifying microorganisms through electrical stimulation. Previous work has demonstrated the capability of bio-electrochemical reactors (BER) to remove a variety of water contaminants, including nitrate, in the presence of a soluble carbon source. The objective of this study was to evaluate the denitrification ...


The Application And Usefulness Of Economic Analyses For Water Quality Management In Coastal Areas, Sheri L. Jewhurst, Kate K. Mulvaney, Marisa J. Mazzotta 2017 US Environmental Protection Agency

The Application And Usefulness Of Economic Analyses For Water Quality Management In Coastal Areas, Sheri L. Jewhurst, Kate K. Mulvaney, Marisa J. Mazzotta

Journal of Ocean and Coastal Economics

Economic studies are increasingly sought as tools to contribute to water quality management in estuaries and coastal communities, yet little is known about how the results from existing studies have been received and utilized by the organizations who solicited them. We interviewed managers from eight organizations who solicited economic studies over the past 15 years to understand how useful the studies were to their organizations and what economic research would be most helpful for their management needs. In terms of utility for coastal managers, there are a number of limitations in the studies. These include lack of site-specific data, the ...


Translating Statistical Species-Habitat Models To Interactive Decision Support Tools, Lyndsie S. Wszola, Victoria L. Simonsen, Erica F. Stuber, Caitlyn R. Gillespie, Lindsey N. Messinger, Karie L. Decker, Jeffrey J. Lusk, Christopher F. Jorgensen, Andrew A. Bishop, Joseph J. Fontaine 2017 University of Nebraska - Lincoln

Translating Statistical Species-Habitat Models To Interactive Decision Support Tools, Lyndsie S. Wszola, Victoria L. Simonsen, Erica F. Stuber, Caitlyn R. Gillespie, Lindsey N. Messinger, Karie L. Decker, Jeffrey J. Lusk, Christopher F. Jorgensen, Andrew A. Bishop, Joseph J. Fontaine

Nebraska Cooperative Fish & Wildlife Research Unit -- Staff Publications

Understanding species-habitat relationships is vital to successful conservation, but the tools used to communicate species-habitat relationships are often poorly suited to the information needs of conservation practitioners. Here we present a novel method for translating a statistical species-habitat model, a regression analysis relating ring-necked pheasant abundance to landcover, into an interactive online tool. The Pheasant Habitat Simulator combines the analytical power of the R programming environment with the user-friendly Shiny web interface to create an online platform in which wildlife professionals can explore the effects of variation in local landcover on relative pheasant habitat suitability within spatial scales relevant to ...


Improving The Accuracy Of Cosmic-Ray Neutron Probe Estimate Of Soil Water Content Using Multiple Detectors And Remote Sensing Estimates Of Vegetation, Xiaochen Dong 2017 University of Nebraska - Lincoln

Improving The Accuracy Of Cosmic-Ray Neutron Probe Estimate Of Soil Water Content Using Multiple Detectors And Remote Sensing Estimates Of Vegetation, Xiaochen Dong

Dissertations & Theses in Natural Resources

The recently developed Cosmic-ray Neutron Probe (CRNP) for estimating soil water content (SWC) fills a critical measurement gap between point scale methods and large scale measurements collected from remote sensing. CRNP works by measuring the change in low-energy neutron intensity over time. However, the accuracy of CRNP to measure SWC is well known to be affected by other hydrogen sources (e.g. soil organic content, atmospheric water vapor, vegetation and surface water). This study focuses on the influence of rapidly growing vegetation in agricultural fields on the accuracy of the CRNP method. Here we use data from three long-term CRNP ...


Factors Affecting Clean And Safe Water Availability In Butansi And Namasagali Sub-Counties Of Uganda, Sydney Beaurivage 2017 Iowa State University

Factors Affecting Clean And Safe Water Availability In Butansi And Namasagali Sub-Counties Of Uganda, Sydney Beaurivage

Honors Projects and Posters

Boreholes are the only source of water for many residents of the Kamuli district of Uganda. They are the safest form of water for almost all residents of Kamuli. Iowa State University – Uganda Program (ISU-UP), a local non-profit has installed 18 boreholes in different communities in the Kamuli district. While boreholes are critical for life, information about their success is required for appropriate monitoring and evaluation. The objective of this research was to survey community members to better understand the number of residents using the boreholes as their primary water source, their uses of the boreholes and what prevents them ...


Using Film To Inspire Advocacy: An Interview With Shalini Kantayya, Mahvish Ilyas, Siga Wu, Dechan Dalrymple 2017 University of Pennsylvania

Using Film To Inspire Advocacy: An Interview With Shalini Kantayya, Mahvish Ilyas, Siga Wu, Dechan Dalrymple

wH2O: The Journal of Gender and Water

No abstract provided.


Art Reinvented: Connecting Back To Mother Nature, Dechan Dalrymple 2017 University of Pennsylvania

Art Reinvented: Connecting Back To Mother Nature, Dechan Dalrymple

wH2O: The Journal of Gender and Water

No abstract provided.


Notes From The Field: An Assessment Of Wash Programs In West Bengal, India, Mark Lotto 2017 University of Pennsylvania

Notes From The Field: An Assessment Of Wash Programs In West Bengal, India, Mark Lotto

wH2O: The Journal of Gender and Water

No abstract provided.


Caloric Expenditure As An Indicator Of Access To Water, Jeff La Frenierre 2017 Gustavus Adolphus College

Caloric Expenditure As An Indicator Of Access To Water, Jeff La Frenierre

wH2O: The Journal of Gender and Water

Building upon the stated success of the Millennium Development Goal to "halve, by 2015, the proportion of the population without sustainable access to safe drinking water", Goal 6.1 of the Sustainable Development Goals (SD Gs) aims to "by 2030, achieve universal and equitable access to safe and affordable drinking water for all." However, 'access' as currently defined allows for a water source to be outside of the home, by tradition as much as 1 kilometer away. As a result, as many as 2.3 billion people live in households considered to have achieved 'access' but who remain reliant on ...


Empowering Women In The Wash Sector: A Woman's Burden, Yari Greeney, Becky Chanis, Gemma Bulos, Rachel Cardone 2017 University of Pennsylvania

Empowering Women In The Wash Sector: A Woman's Burden, Yari Greeney, Becky Chanis, Gemma Bulos, Rachel Cardone

wH2O: The Journal of Gender and Water

No abstract provided.


Arsenic Poisoning In Rural Bangladesh-An Intersectional Analysis Of Impact In Women, Louise Andersson, Dr. Martina Angela Caretta 2017 Stockholm University

Arsenic Poisoning In Rural Bangladesh-An Intersectional Analysis Of Impact In Women, Louise Andersson, Dr. Martina Angela Caretta

wH2O: The Journal of Gender and Water

Based on a qualitative case study in six arsenic acute villages in southwest Bangladesh, this paper presents the intersectional impact of the arsenic poisoning crisis in rural Bangladesh. Findings indicate that the arsenic poisoning crisis is aggravating existing gender inequalities as well as gender roles and responsibilities. The gender inequalities related to arsenicosis are manifested in the access to health care and in the degree of social stigma: women are the biggest victims, unmarried women in particular. The study shows that multiple axis of oppression as class, disability and age are crucial in determining the magnitude of the arsenic poisoning ...


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