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Full-Text Articles in Life Sciences

Goomig Farmlands Development Baseline Water Quality In The Lower Keep River, D L. Bennett, Richard J. George Dr Nov 2014

Goomig Farmlands Development Baseline Water Quality In The Lower Keep River, D L. Bennett, Richard J. George Dr

Resource management technical reports

In 2008 the Ord Irrigation Expansion Project was approved by the Western Australian Government to develop irrigated agriculture on the Weaber Plain. By mid-2014 construction of almost all of the water supply, drainage, access, monitoring and other infrastructure for the 7400ha Goomig Farmlands development had substantially been completed. An important concern is the effect the Goomig Farmlands development may have on the water quality of the downstream lower Keep River aquatic environment, particularly as it relates to threatened species that inhabit or may inhabit the area. Possible increases in salinity, nutrients, suspended sediment, heavy metals and farm chemicals delivered in ...


2014 Chart Book: Winter Management, Carolyn J. Demoranville Mar 2014

2014 Chart Book: Winter Management, Carolyn J. Demoranville

Cranberry Chart Book - Management Guide

No abstract provided.


2014 Chart Book: Irrigation Water Management, Peter Jeranyama Mar 2014

2014 Chart Book: Irrigation Water Management, Peter Jeranyama

Cranberry Chart Book - Management Guide

No abstract provided.


Effects Of Tillage And Application Rate On Atrazine Transport To Subsurface Drainage: Evaluation Of Rzwqm Using A Six-Year Field Study, Robert W. Malone, B. T. Nolan, Liwang Ma, Rameshwar S. Kanwar, Carl H. Pederson, Philip Heilman Jan 2014

Effects Of Tillage And Application Rate On Atrazine Transport To Subsurface Drainage: Evaluation Of Rzwqm Using A Six-Year Field Study, Robert W. Malone, B. T. Nolan, Liwang Ma, Rameshwar S. Kanwar, Carl H. Pederson, Philip Heilman

Agricultural and Biosystems Engineering Publications

Well tested agricultural system models can improve our understanding of the water quality effects of management practices under different conditions. The Root Zone Water Quality Model (RZWQM) has been tested under a variety of conditions. However, the current model's ability to simulate pesticide transport to subsurface drain flow over a long term period under different tillage systems and application rates is not clear. Therefore, we calibrated and tested RZWQM using six years of data from Nashua, Iowa. In this experiment, atrazine was spring applied at 2.8 (1990–1992) and 0.6 kg/ha/yr (1993–1995) to two ...


Predicting Phosphorus Dynamics In Complex Terrains Using A Variable Source Area Hydrology Model, Amy S. Collick, Daniel R. Fuka, Peter J.A. Kleinman, Anthony R. Buda, Jennifer L. Weld, Mike J. White, Tamie L. Veith, Ray B. Bryant, Carl H. Bolster, Zachary M. Easton Jan 2014

Predicting Phosphorus Dynamics In Complex Terrains Using A Variable Source Area Hydrology Model, Amy S. Collick, Daniel R. Fuka, Peter J.A. Kleinman, Anthony R. Buda, Jennifer L. Weld, Mike J. White, Tamie L. Veith, Ray B. Bryant, Carl H. Bolster, Zachary M. Easton

Publications from USDA-ARS / UNL Faculty

Phosphorus (P) loss from agricultural watersheds has long been a critical water quality problem, the control of which has been the focus of considerable research and investment. Preventing P loss depends on accurately representing the hydrological and chemical processes governing P mobilization and transport. The Soil and Water Assessment Tool (SWAT) is a watershed model commonly used to predict run-off and non-point source pollution transport. SWAT simulates run-off employing either the curve number (CN) or the Green and Ampt methods, both assume infiltration-excess run-off, although shallow soils underlain by a restricting layer commonly generate saturation-excess run-off from variable source areas ...


Assessing Monitoring And Modeling Approaches To Improve Water Quality In The Hickory Grove Lake, Rohith Gali Jan 2014

Assessing Monitoring And Modeling Approaches To Improve Water Quality In The Hickory Grove Lake, Rohith Gali

Graduate Theses and Dissertations

Surface water quality regulated by agricultural pollution remains to be an important environmental concern around the world. Major contaminants from agriculture systems such as bacteria, sediment, and nutrients (nitrogen and phosphorus) continue to affect the designated use of a waterbody. As per the Clean Water Act legislation, water quality impairments must be addressed through the Total Maximum Daily Load (TMDL) approach. The TMDL program is a comprehensive and watershed-scale approach involving contaminant source identification and quantification, and conservation practice recommendation to reduce contaminant transport. The overall goal of this study was to improve the TMDL development process in achieving water ...


Grazing Management Effects On Environmental Quality Of Riparian And Upland Grassland Ecosystems, Justin Bisinger Jan 2014

Grazing Management Effects On Environmental Quality Of Riparian And Upland Grassland Ecosystems, Justin Bisinger

Graduate Theses and Dissertations

Grazing cattle in grasslands can impact many ecosystems services including the movement of sediment and nutrients to water bodies, biodiversity, and wildlife habitat. In riparian grassland ecosystems congregation of cattle in or near streams may increase the sediment, nutrient, and pathogen loading of surface water resources, however the impact of cattle on water bodies may be limited through pasture characteristics or management practices that reduce congregation of cattle in or near streams. The first study in this thesis was designed to determine the effects of pasture size, stream access, and off-stream water on the presence of cattle near pasture streams ...


Prairie Strips: Bringing Biodiversity, Improved Water Quality, And Soil Protection To Agriculture, Lisa A. Schulte Moore Jan 2014

Prairie Strips: Bringing Biodiversity, Improved Water Quality, And Soil Protection To Agriculture, Lisa A. Schulte Moore

Natural Resource Ecology and Management Publications

The motivation for expanding the basket of goods that Midwestern farms produce is strong. While our current agricultural system achieves record productivity in crops and livestock, it is also associated with serious environmental shortcomings, including declines in water quality and biodiversity, increased flooding and greenhouse gas emissions, and even degradation of the foundation of agricultural productivity: the soil.


Predicting Time Cattle Spend In Streams To Quantify Direct Deposition Of Manure, Shannon B. Brown, Charles D. Ikenberry, Michelle L. Soupir, Justin J. Bisinger, James R. Russell Jan 2014

Predicting Time Cattle Spend In Streams To Quantify Direct Deposition Of Manure, Shannon B. Brown, Charles D. Ikenberry, Michelle L. Soupir, Justin J. Bisinger, James R. Russell

Agricultural and Biosystems Engineering Publications

Current methods to predict bacterial loads into streams resulting from direct deposition of manure by livestock do not consider factors that influence livestock behavior. Data from three studies that monitored spatial behavior of cattle through GPS were used to develop a new method with increased temporal resolution and consideration of environmental factors to predict the time that cattle spend in streams. Information on relative location of the cattle to the pasture stream was used to calculate the number of hours a cow spent in the stream, and from that the load of bacteria deposited directly into the stream. Ultimately, four ...


Assessing Linkages Between E. Coli Levels In Streambed Sediment And Overlying Water In An Agricultural Watershed In Iowa During The First Heavy Rain Event Of The Season, Pramod K. Pandey, Michelle L. Soupir Jan 2014

Assessing Linkages Between E. Coli Levels In Streambed Sediment And Overlying Water In An Agricultural Watershed In Iowa During The First Heavy Rain Event Of The Season, Pramod K. Pandey, Michelle L. Soupir

Agricultural and Biosystems Engineering Publications

This study involved field observations in Squaw Creek watershed, located in central Iowa, to investigate the impact of a heavy rain event (rainfall of 71 mm in 24 h) on E. coli levels in the streambed sediment and overlying water. We assessed relationships between streamflow and E. coli and nutrient levels in the water column and streambed sediment. The results showed that during a heavy rain event, E. coli levels in the water column varied considerably, ranging from 360 to 37,553 CFU per 100 mL with a mean of 7,598 CFU per 100 mL. Elevated streamflow resulted in ...