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Cover Crop Effect On Subsequent Wheat Yield In The Central Great Plains, David Nielsen, Drew Lyon, Robert Higgins, Gary Hergert, Johnathon Holman, Merle Vigil 2016 Washington State University

Cover Crop Effect On Subsequent Wheat Yield In The Central Great Plains, David Nielsen, Drew Lyon, Robert Higgins, Gary Hergert, Johnathon Holman, Merle Vigil

David C. Nielsen

Crop production systems in the water-limited environment of the semiarid central Great Plains may not have potential to profitably use cover crops because of lowered subsequent wheat (Triticum asestivum L.) yields following the cover crop. Mixtures have reportedly shown less yield-reducing effects on subsequent crops than single-species plantings. This study was conducted to determine winter wheat yields following both mixtures and single-species plantings of spring-planted cover crops. The study was conducted at Akron, CO, and Sidney, NE, during the 2012–2013 and 2013–2014 wheat growing seasons under both rainfed and irrigated conditions. Precipitation storage efficiency before wheat planting, wheat ...


Leveraging The Plant Biotechnology Toolbox For Aquaculture: Production Of Protein Therapeutants For Promoting Fish Immune Health, Lana L. Elkins 2016 Arkansas State University - Main Campus

Leveraging The Plant Biotechnology Toolbox For Aquaculture: Production Of Protein Therapeutants For Promoting Fish Immune Health, Lana L. Elkins

2nd International Conference of Fish & Shellfish Immunology

No abstract provided.


The Distribution, Growth, Reproduction And Population Genetics Of A Mangrove Species, Rhizophora Stylosa Griff, Near Its Southern Limits In New South Wales, Australia, Nicholas Charles Wilson 2016 Australian Catholic University

The Distribution, Growth, Reproduction And Population Genetics Of A Mangrove Species, Rhizophora Stylosa Griff, Near Its Southern Limits In New South Wales, Australia, Nicholas Charles Wilson

Theses

Rhizophora stylosa is a common and widespread mangrove species on tropical coasts in the Indo-West Pacific and very common and widespread in northern Australia. This aim of this study was to investigate R. stylosa's distribution, growth, reproduction and population genetics over the last 300 kms of its range at its southern limits in northern New South Wales on the Australian east coast. Rhizophora stylosa was found to be more widespread between and within estuaries in northern New South Wales than previously recorded, with evident spread over recent decades. A new southern limit of South West Rocks Creek was determined ...


Hands Of The Future, Inc; Junior Nature Club; Living Schoolyards, Zonda K. Bryant 2016 Hands of the Future, Inc

Hands Of The Future, Inc; Junior Nature Club; Living Schoolyards, Zonda K. Bryant

Purdue P-12 Networking Summit & Poster Session

Programs to connect children to nature


Dawn Or Doom: The Risks And Rewards Of Emerging Technologies, Diana Hancock, Steve Tally, Gerry McCartney, Michele Arthur 2016 Purdue University

Dawn Or Doom: The Risks And Rewards Of Emerging Technologies, Diana Hancock, Steve Tally, Gerry Mccartney, Michele Arthur

Purdue P-12 Networking Summit & Poster Session

Dawn or Doom is a free and open to the public conference at Purdue where we focus on benefits and risks surrounding some of the technologies that are both the most disruptive to current practices and being adopted the fastest. A collection of Purdue faculty experts and some outside speakers showcase their many perspectives related to this technology explosion, explore conditions that will foster innovation and investment into the next generation, and address the big-picture issues where both optimism and pessimism are warranted.


Livestock Manure Windrow Composting Runoff And Infiltration Characteristics From Laboratory Rainfall Simulations, David F. Webber, Steven K. Mickelson, Bryan D. Whitman, T. L. Richard, Heekwon Ahn 2016 Iowa State University

Livestock Manure Windrow Composting Runoff And Infiltration Characteristics From Laboratory Rainfall Simulations, David F. Webber, Steven K. Mickelson, Bryan D. Whitman, T. L. Richard, Heekwon Ahn

Steven K. Mickelson

Windrow-composted livestock manure has been shown to be less hazardous to the environment compared to manure directly applied to cropland and other agricultural areas. Although offsite contaminant losses through runoff and leaching can occur during the composting process, these losses are suspected to increase under different compost moisture conditions and as composted materials mature. This research quantified the effects of windrow-composted livestock manure and straw bedding components on runoff and infiltration characteristics from laboratory rainfall simulations. Compost samples collected on three dates at approximately the beginning (day 0), middle (day 30), and end (day 60) of a June-July 2004 field ...


Impacts Of Cattle Grazing Management On Sediment And Phosphorus Loads In Surface Waters, Mathew M. Haan, James R. Russell, Wendy Powers, John Kovar, Richard C. Schultz, Steven K. Mickelson 2016 Iowa State University

Impacts Of Cattle Grazing Management On Sediment And Phosphorus Loads In Surface Waters, Mathew M. Haan, James R. Russell, Wendy Powers, John Kovar, Richard C. Schultz, Steven K. Mickelson

Steven K. Mickelson

The amounts of sediment and phosphorus (P) in water runoff from agricultural lands are of concern because of the potential for siltation and eutrophication of surface waters. There is limited information about the total sediment and P loads in runoff from pastureland in the Midwest. Because vegetation limits soil disruption caused by the impact of raindrops and forage roots hold soil particles, pastures grazed using suitable management practices should maintain water infiltration and minimize sediment and P losses in water runoff. Once sediment and P have been dislodged from the landscape, vegetative buffers can be an effective tool for reducing ...


Identification Of Candidate Genes Underlying An Iron Efficiency Quantitative Trait Locus In Soybean, Gregory A. Peiffer, Keith E. King, Andrew J. Severin, Gregory D. May, Silvia R. Cianzio, Shun Fu Lin, Nicholas C. Lauter, Randy C. Shoemaker 2016 Iowa State University

Identification Of Candidate Genes Underlying An Iron Efficiency Quantitative Trait Locus In Soybean, Gregory A. Peiffer, Keith E. King, Andrew J. Severin, Gregory D. May, Silvia R. Cianzio, Shun Fu Lin, Nicholas C. Lauter, Randy C. Shoemaker

Andrew Severin

Prevalent on calcareous soils in the United States and abroad, iron deficiency is among the most common and severe nutritional stresses in plants. In soybean (Glycine max) commercial plantings, the identification and use of iron-efficient genotypes has proven to be the best form of managing this soil-related plant stress. Previous studies conducted in soybean identified a significant iron efficiency quantitative trait locus (QTL) explaining more than 70% of the phenotypic variation for the trait. In this research, we identified candidate genes underlying this QTL through molecular breeding, mapping, and transcriptome sequencing. Introgression mapping was performed using two related near-isogenic lines ...


Subfield Profitability Analysis Reveals An Economic Case For Cropland Diversification, Elke Brandes, Gabriel Sean McNunn, Lisa A. Schulte, Ian J. Bonner, D. J. Muth, Bruce A. Babcock, Bhavna Sharma, Emily A. Heaton 2016 Iowa State University

Subfield Profitability Analysis Reveals An Economic Case For Cropland Diversification, Elke Brandes, Gabriel Sean Mcnunn, Lisa A. Schulte, Ian J. Bonner, D. J. Muth, Bruce A. Babcock, Bhavna Sharma, Emily A. Heaton

Bruce Babcock

Public agencies and private enterprises increasingly desire to achieve ecosystem service outcomes in agricultural systems, but are limited by perceived conflicts between economic and ecosystem service goals and a lack of tools enabling effective operational management. Here we use Iowa—an agriculturally homogeneous state representative of the Maize Belt—to demonstrate an economic rationale for cropland diversification at the subfield scale. We used a novel computational framework that integrates disparate but publicly available data to map ∼3.3 million unique potential management polygons (9.3 Mha) and reveal subfield opportunities to increase overall field profitability. We analyzed subfield profitability for ...


Placing Bounds On Extreme Temperature Response Of Maize, Christopher J. Anderson, Bruce A. Babcock, Yixing Peng, Philip W. Gassman, Todd D. Campbell 2016 Iowa State University

Placing Bounds On Extreme Temperature Response Of Maize, Christopher J. Anderson, Bruce A. Babcock, Yixing Peng, Philip W. Gassman, Todd D. Campbell

Bruce Babcock

Plant water availability is a key factor that determines maize yield response to excess heat. Lack of available data has limited researchers' ability to estimate this relationship at regional and global scales. Using a new soil moisture data set developed by running a crop growth simulator over historical data we demonstrate how current estimates of maize yield sensitivity to high temperature are misleading. We develop an empirical model relating observed yields to climate variables and soil moisture in a high maize production region in the United States to develop bounds on yield sensitivity to high temperatures. For the portion of ...


Managing The Risk Of European Corn Borer Resistance To Transgenic Corn: An Assessment Of Refuge Recommendations, Terrance M. Hurley, Sylvia Secchi, Bruce A. Babcock, Richard L. Hellmich 2016 Iowa State University

Managing The Risk Of European Corn Borer Resistance To Transgenic Corn: An Assessment Of Refuge Recommendations, Terrance M. Hurley, Sylvia Secchi, Bruce A. Babcock, Richard L. Hellmich

Bruce Babcock

The use of Genetically Modified Organisms (GMOs) in agriculture has been on the rise since 1995. Scientists have been working to develop a high-dose refuge management plan that can effectively delay European corn borer resistance to pesticidal GMO corn. This paper develops a stochastic agricultural production model to assess and provide insight into the reasons why refuge recommendations remain controversial.


Ag Supplies For 2015, Chad Hart, Lee L. Schulz 2016 Iowa State University

Ag Supplies For 2015, Chad Hart, Lee L. Schulz

Lee Schulz

Markets are the mechanism that balance supply and demand for products. Over the course of the past year, we have discussed the demand patterns for agricultural products in the US and the factors that influence that demand. Now it’s time to look at the other half of the marketplace: agricultural product supplies. During the past couple of years, crop and livestock supplies have been moving in opposite directions. Crop supplies have grown as farmers have brought more land into corn and soybean production and weather conditions allowed record yields. Meanwhile, livestock supplies have shrunk as livestock producers reduced herds ...


Maintaining Food Safety Through Quality, Charles R. Hurburgh Jr., Daniel D. Loy, John D. Lawrence 2016 Iowa State University

Maintaining Food Safety Through Quality, Charles R. Hurburgh Jr., Daniel D. Loy, John D. Lawrence

John Lawrence

Food safety is a worldwide issue affecting millions of people who suffer from diseases caused by contaminated food. An estimated 76 million cases of foodborne disease occur each year in the United States. Policy makers are looking to enhanced quality management systems for tracing food back to its source.

This report will give producers, researchers and consumers a summary of efforts by Iowa State University Extension in food safety, quality management systems and traceability of grain and livestock products.


Nitrogen Addition Shapes Soil Phosphorus Availability In Two Reforested Tropical Forests In Southern China, Xiankai Lu, Jiangming Mo, Frank S. Gilliam, Hua Fang, Feifei Zhu, Yunting Fang, Wei Zhang, Juan Huang 2016 Marshall University

Nitrogen Addition Shapes Soil Phosphorus Availability In Two Reforested Tropical Forests In Southern China, Xiankai Lu, Jiangming Mo, Frank S. Gilliam, Hua Fang, Feifei Zhu, Yunting Fang, Wei Zhang, Juan Huang

Frank S. Gilliam

Scant information is available on how soil phosphorus (P) availability responds to atmospheric nitrogen (N) deposition, especially in the tropical zones. This study examined the effect of N addition on soil P availability, and compared this effect between forest sites of contrasting land-use history. Effects of N addition on soil properties, litterfall production, P release from decomposing litter, and soil P availability were studied in a disturbed (reforested pine forest with previous understory vegetation and litter harvesting) and a rehabilitated (reforested mixed pine/broadleaf forest with no understory vegetation and litter harvesting) tropical forest in southern China. Experimental N-treatments (above ...


Analysis And Formulation Of Food Crop Policy For Indonesia, Stanley R. Johnson, William H. Meyers, Helen H. Jensen, Paul M. Heytens, Basile P. Goungetas, Thulasiram Kesavan, Gary L. Stampley, Patrick C. Westhoff, Jori Elisiana, Justo Manrique 2016 Iowa State University

Analysis And Formulation Of Food Crop Policy For Indonesia, Stanley R. Johnson, William H. Meyers, Helen H. Jensen, Paul M. Heytens, Basile P. Goungetas, Thulasiram Kesavan, Gary L. Stampley, Patrick C. Westhoff, Jori Elisiana, Justo Manrique

Helen Jensen

This study of Indonesia's food policy formulation was initiated in February 1989. The study, conducted in collaboration with the Ministry of Agriculture, was funded by the U.S. Agency for International Development. Junior Minister Sjarifuddin Baharsjah of the Ministry of Agriculture, and Faisal Kasryno, director of the Bureau of Planning, were on the study's steering committee and helped to plan, organize, and implement the study and associated workshops. Their support of efforts to enhance the Ministry's capabilities for policy analysis greatly benefited the course of study activities.


Cover Crops Can Affect Subsequent Wheat Yield In The Central Great Plains, David C. Nielsen, Merle F. Vigil, Drew J. Lyon, Robert K. Higgins, Gary W. Hergert, Johnathon D. Holman 2016 USDA-ARS

Cover Crops Can Affect Subsequent Wheat Yield In The Central Great Plains, David C. Nielsen, Merle F. Vigil, Drew J. Lyon, Robert K. Higgins, Gary W. Hergert, Johnathon D. Holman

David C. Nielsen

No abstract provided.


Preparing For Soybean Rust, Chad E. Hart 2016 Iowa State University

Preparing For Soybean Rust, Chad E. Hart

Chad Hart

On November 10, 2004, the first confirmed case of soybean rust was found in the continental United States, in Louisiana. (Hawaii has had soybean rust since 1994.) In the weeks that followed, soybean rust was also confirmed in Alabama, Arkansas, Florida, Georgia, Mississippi, Missouri, South Carolina, and Tennessee. The most likely scenario as to how soybean rust arrived in the continental United States is via Hurricane Ivan. Ivan formed in the Atlantic in early September, brushed the South American coast, and proceeded to strike the southeastern United States, carrying rust spores from Colombia and Venezuela. This scenario highlights the ability ...


Projected Demand For Iowa Crops, Chad E. Hart 2016 Iowa State University

Projected Demand For Iowa Crops, Chad E. Hart

Chad Hart

Demand for Iowa crops has been helped by outside influences, especially the recovery in energy prices. Ethanol margins have moved above breakeven and support for biofuels has been boosted by the substantial rise in crude oil prices over the past year. The energy price recovery has helped ethanol margins remain positive over the past several months. Biofuels continue to see support from higher energy prices.


Aflatoxin: Crop Insurance, Charles R. Hurburgh Jr., Chad E. Hart 2016 Iowa State University

Aflatoxin: Crop Insurance, Charles R. Hurburgh Jr., Chad E. Hart

Chad Hart

Aflatoxin is covered under multi-peril crop insurance. The settlement is done as a deducted percentage of actual yield depending on the aflatoxin level. Producers will receive the grain after settlement.


Optimal Efficiency In The Use Of Iowa's Energy, Soil, And Feed Resources For Beef Production, James R. Russell, Allen H. Trenkle, Daryl R. Strohbehn, Walter F. Wedin, Stephen K. Barnhart, Arne Hallam, Mark S. Honeyman 2016 Iowa State University

Optimal Efficiency In The Use Of Iowa's Energy, Soil, And Feed Resources For Beef Production, James R. Russell, Allen H. Trenkle, Daryl R. Strohbehn, Walter F. Wedin, Stephen K. Barnhart, Arne Hallam, Mark S. Honeyman

Arne Hallam

Soil erodes over six times faster from cultivated Iowa cropland than from pastureland, even though almost 12 percent more of the pastureland acres are classified as highly erodible than the cropland acres. Because of serious concern about excessive erosion of Iowa's topsoil, profitable alternatives to row-crop production are needed for soils like those found in much of southern Iowa.


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