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Full-Text Articles in Life Sciences

Life Cycle Assessment And Techno-Economic Analysis Of Ethanol Production: A Review, Maria C. T. B. Oliveira, Kurt A. Rosentrater Jul 2017

Life Cycle Assessment And Techno-Economic Analysis Of Ethanol Production: A Review, Maria C. T. B. Oliveira, Kurt A. Rosentrater

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

Fossil fuels are considered one of the most contributing for increasing the rate of greenhouse gas (GHG) emissions. On the other hand, renewable energy derived from biomass promising to reduce significantly the CO2 emissions, promoting less environmental impacts for the future generations. Nowadays, the cost and the environmental impacts of the process are the challenges for producing a green product with lower cost. Numerous research has been published over the lasts decades, but gaps remain in understanding the sustainability and the environmental impact of the ethanol production. The techno-economic analysis is designed in order to optimize one process, and the ...


Techno-Economic Modeling Of Coproduct Processing In A Corn Based Ethanol Plant In 2012, Christine Wood, Kurt A. Rosentrater, Kasiviswanathan Muthukumarappan Jul 2013

Techno-Economic Modeling Of Coproduct Processing In A Corn Based Ethanol Plant In 2012, Christine Wood, Kurt A. Rosentrater, Kasiviswanathan Muthukumarappan

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

Coproducts, such as Distillers Dried Grains with Solubles (DDGS), produced during ethanol production are essential to the economic sustainability of each ethanol plant as they provide an additional source of revenue. DDGS is extensively used as animal feed, but has a relatively low market value compared to the biofuel. By fractioning DDGS into lighter and heavier fractions, the overall composition changes potentially increasing the value of the coproducts as they become more desirable to different markets. Earlier studies have examined fractionating DDGS using sieves and aspirators. This project examined the techno-economics of adding fractionation systems onto an existing 40 million ...


Review Of Housing Options For Gestating Sows, Dustin J. Schau, Jeremy D. Brue, Kurt A. Rosentrater Jul 2013

Review Of Housing Options For Gestating Sows, Dustin J. Schau, Jeremy D. Brue, Kurt A. Rosentrater

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

Housing options for gestating sows is an important topic affecting livestock producers, consumers, and policy makers. Producers seek to provide high quality products at affordable prices while meeting increasing public demands for animal wellbeing. Several studies have been conducted over the years to compare group and individual housing options for gestating sows. The object of this paper was to review these studies and to look specifically at the areas of animal wellbeing and economic impact of housing type. Several types of housing and feed management plans were examined from previous studies and the impact of housing type was explored. Overall ...


Techno-Economic Modeling Of A Degummed Soybean Oil Biorefinery In 2005 & 2012, Bailley A. Richardson, Kurt A. Rosentrater Jul 2013

Techno-Economic Modeling Of A Degummed Soybean Oil Biorefinery In 2005 & 2012, Bailley A. Richardson, Kurt A. Rosentrater

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

As the biofuels industry expands, it is important to identify and quantize potential capital, operational, material, and utility costs, as well as possible sales prices for the biofuels and coproducts. Many industries use computer simulation programs for this function, as well as to see how using different operations can affect the overall production at the plant. The objective of this project was to determine how various operation scenarios affected capital, operational, material, and utility costs of a biodiesel biorefinery. These costs were examined using a techno-economic modeling program for a degummed soybean oil plant. It was clear after seeing economic ...


Agronomic, Environmental And Economic Performance Of Alternative Biomass Cropping Systems, Lisa A. Schulte Moore, Kenneth J. Moore, Richard B. Hall, Arne Hallam, Matt Helmers Jan 2013

Agronomic, Environmental And Economic Performance Of Alternative Biomass Cropping Systems, Lisa A. Schulte Moore, Kenneth J. Moore, Richard B. Hall, Arne Hallam, Matt Helmers

Leopold Center Completed Grant Reports

If cellulosic biomass is to play a significant role in America's energy future, research needs to be conducted on the optimal production and placement practices. This project looked at a portfolio of biomass cropping systems that might be adopted for Iowa.


Aflatoxin: Crop Insurance, Charles R. Hurburgh Jr., Chad E. Hart Sep 2012

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

Integrated Crop Management News

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.


Energy Use In Pig Production: An Examination Of Current Iowa Systems, Peter J. Lammers, M. Douglas Kenealy, James B. Kliebenstein, Jay D. Harmon, Matthew J. Helmers, Mark S. Honeyman Mar 2012

Energy Use In Pig Production: An Examination Of Current Iowa Systems, Peter J. Lammers, M. Douglas Kenealy, James B. Kliebenstein, Jay D. Harmon, Matthew J. Helmers, Mark S. Honeyman

Agricultural and Biosystems Engineering Publications

This paper compares energy use for different pig production systems in Iowa, a leader in US swine production. Pig production systems include not only the growth and performance of the pigs, but also the supporting infrastructure of pig production. This supporting infrastructure includes swine housing, facility management, feedstuff provision, swine diets, and manure management. Six different facility type × diet formulation × cropping sequence scenarios were modeled and compared. The baseline system examined produces 15,600 pigs annually using confinement facilities and a corn-soybean cropping sequence. Diet formulations for the baseline system were corn-soybean meal diets that included the synthetic AA L-lysine ...


An Engineering-Economic Model For Analyzing Dairy Plug-Flow Anaerobic Digesters: Cost Structures And Policy Implications, Carol Rose Faulhaber, D. Raj Raman, Robert Burns Jan 2012

An Engineering-Economic Model For Analyzing Dairy Plug-Flow Anaerobic Digesters: Cost Structures And Policy Implications, Carol Rose Faulhaber, D. Raj Raman, Robert Burns

Agricultural and Biosystems Engineering Publications

Treating animal wastes through anaerobic digestion (AD) yields methane-rich biogas that can be used for power generation or heating, and a nutrient-rich digestate that can be land-applied as fertilizer. Furthermore, AD reduces odors from stored and land-applied manures. Despite these benefits, AD deployment rates in the U.S. are only 5% for dairy farms identified as suitable for AD by the U.S. Environmental Protection Agency. The objective of this study was to analyze the economic and technical limitations of farm-scale anaerobic digesters using a simple model permitting insight into the fundamental constraints on the technology. A model was developed ...


Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe Jan 2011

Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe

Leopold Center Completed Grant Reports

Four case studies were developed for Iowa farm operations that have successfully used machinery and labor sharing arrangements for intergenerational transfer of farm assets. Results were shared at workshops and through publication of a resource manual.


Nonsolar Energy Use And One-Hundred-Year Global Warming Potential Of Iowa Swine Feedstuffs And Feeding Strategies, Peter J. Lammers, M. Douglas Kenealy, James B. Kliebenstein, Jay D. Harmon, Matthew J. Helmers, Mark S. Honeyman Mar 2010

Nonsolar Energy Use And One-Hundred-Year Global Warming Potential Of Iowa Swine Feedstuffs And Feeding Strategies, Peter J. Lammers, M. Douglas Kenealy, James B. Kliebenstein, Jay D. Harmon, Matthew J. Helmers, Mark S. Honeyman

Agricultural and Biosystems Engineering Publications

Demand for nonsolar energy and concern about the implications of fossil fuel combustion have encouraged examination of energy use associated with agriculture. The United States is a global leader in pig production, and the United States swine industry is centered in Iowa. Feed is the largest individual input in pig production, but the energy consumption of the Iowa swine feed production chain has yet to be critically examined. This analysis examines nonsolar energy use and resulting 100-yr global warming potential (GWP) associated with the swine feed production chain, beginning with cultivation of crops and concluding with diet formulation. The nonsolar ...


Ag Decision Maker: Combine Ownership Or Custom Hire, William M. Edwards, H. Mark Hanna Nov 2009

Ag Decision Maker: Combine Ownership Or Custom Hire, William M. Edwards, H. Mark Hanna

Agriculture and Environment Extension Publications

Includes advantages and disadvantages of custom hiring and information on estimating costs; includes worksheets.


Comparison Of Construction Costs For Vegetated Treatment Systems In The Midwest, Bradley J. Bond, Robert T. Burns, Todd P. Trooien, Stephen H. Pohl, Christopher G. Henry, Lara B. Moody, Matthew J. Helmers, John Lawrence Jun 2009

Comparison Of Construction Costs For Vegetated Treatment Systems In The Midwest, Bradley J. Bond, Robert T. Burns, Todd P. Trooien, Stephen H. Pohl, Christopher G. Henry, Lara B. Moody, Matthew J. Helmers, John Lawrence

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

Vegetated treatment systems (VTSs) provide an alternative to containment basin systems for beef feedlot runoff control. Beef producers in the Midwestern United States have shown an increasing interest in using VTSs as a perceived lower cost option to containment basin systems. This paper reports the actual construction costs associated with 21 VTSs (eight on permitted Concentrated Animal Feeding Operations (CAFOs) and 13 on non permitted Animal Feeding Operations (AFOs)) located within Iowa, Minnesota, South Dakota, and Nebraska. The VTS construction costs are reported on a per head basis in 2009 adjusted dollars for each system. Cost comparisons are presented between ...


Resource Conservation Practices: Consideration In Selecting No-Till, Mahdi Al-Kaisi, H. Mark Hanna, Michael D. Duffy Jul 2008

Resource Conservation Practices: Consideration In Selecting No-Till, Mahdi Al-Kaisi, H. Mark Hanna, Michael D. Duffy

Agriculture and Environment Extension Publications

Consider the advantages of a no-till system. This publication looks at weed control, residue management, equipment requirements, nutrient management and the results of yield and economic return studies.


Simulating The Effects Of Spatially Variable Irrigation On Corn Yields, Costs, And Revenue In Iowa, Kendall C. Dejonge, Amy L. Kaleita, Kelly R. Thorp Aug 2007

Simulating The Effects Of Spatially Variable Irrigation On Corn Yields, Costs, And Revenue In Iowa, Kendall C. Dejonge, Amy L. Kaleita, Kelly R. Thorp

Agricultural and Biosystems Engineering Publications

In this study, the CERES-Maize crop model was used in conjunction with Apollo, a shell program, to evaluate potential improved yield in a central Iowa cornfield on a spatially and temporally variable basis. Five years of historical yield and weather data were used to calibrate the model over 100 spatially variable grid cells for non-irrigated conditions in the 20.25 ha field. This calibrated model then used 28 years of historical weather data to simulate three irrigation scenarios: no irrigation, scheduled uniform irrigation, and precision irrigation. Irrigation improved yield by at least 500 kg ha−1 in half of the ...


Combine Harvester Econometric Model With Forward Speed Optimization, Nathan E. Isaac, Graeme R. Quick, Stuart J. Birrell, William M. Edwards, Bruce A. Coers Jan 2006

Combine Harvester Econometric Model With Forward Speed Optimization, Nathan E. Isaac, Graeme R. Quick, Stuart J. Birrell, William M. Edwards, Bruce A. Coers

Agricultural and Biosystems Engineering Publications

A combine harvester econometric simulation model was developed with the goal of matching the combine forward speed to the maximum harvested net income per acre. The model considers the machinery management costs of owning a combine and platform header for harvesting wheat. A statistical Design of Experiment (DOE) was used to evaluate the model using tri-level variables; the medium values constituted the model base case. Of the 27 input variables, the optimum speed was significantly influenced by the crop area, G/MOG ratio, grain unit price, field yield, field efficiency, grain moisture content, probability of a working day in the ...


Comparison Of Different Styles Of Swine Finishing Facilities Within A Uniform Production System, David R. Stender, Jay D. Harmon, Jerry D. Weiss, Darci Cox Jan 2003

Comparison Of Different Styles Of Swine Finishing Facilities Within A Uniform Production System, David R. Stender, Jay D. Harmon, Jerry D. Weiss, Darci Cox

Agricultural and Biosystems Engineering Publications

Swine originating from one farrowing and nursery source were grown in five different finishing facility types. Three of the facilities were considered contemporary styles and two facilities were based on older technologies. The total data set included information collected on 46,408 pigs from 25 groups. The three contemporary facility styles included a fully slatted, hybrid ventilated facility; a fully slatted tunnel ventilated facility; and a partially slatted naturally ventilated facility. These newer facilities were compared to an older, less environmentally controlled facility and an outdoor feeding lot. No significant differences were observed in production performance of the three styles ...


Minimizing The Use Of Antibiotics In Pork Production, Palmer J. Holden, John Carr, Mark S. Honeyman, James B. Kliebenstein, James D. Mckean, Jay D. Harmon, John W. Mabry, Sherry Hoyer Oct 2002

Minimizing The Use Of Antibiotics In Pork Production, Palmer J. Holden, John Carr, Mark S. Honeyman, James B. Kliebenstein, James D. Mckean, Jay D. Harmon, John W. Mabry, Sherry Hoyer

Iowa Pork Industry Center Fact Sheets

Details on minimizing antibiotic use in pork production such as reducing stress. Other issues to consider include biosecurity measures and increased costs of producing antibiotic-free pigs.


Liquid Dairy Waste Transport And Land Application Cost Comparisons Considering Herd Size, Transport Distance, And Nitrogen Versus Phosphorus Application Rates, Robert T. Burns, A. S. Daugherty, T. L. Cross, D. Raj Raman, G. F. Grandle Jul 2001

Liquid Dairy Waste Transport And Land Application Cost Comparisons Considering Herd Size, Transport Distance, And Nitrogen Versus Phosphorus Application Rates, Robert T. Burns, A. S. Daugherty, T. L. Cross, D. Raj Raman, G. F. Grandle

D. Raj Raman

This study provides cost comparisons for the transport and application of dairy waste slurries based on both phosphorus and nitrogen application rates. Estimated cost comparisons are made for several commonly used systems for dairy waste transport and application. Five dairy sizes ranging from 50 to 2,000 cows using 13 transport and application systems were evaluated. For each dairy size, the costs associated with the transport and application system combinations were determined for transport distances of 0.5, 1.5, and 4.5 miles for both nitrogen and phosphorus-based application rates. Total annual system cost, cost per acre, cost per ...


Economic Analysis Of Variable Rate Management For Corn And Soybean Systems, William D. Batchelor, Bruce A. Babcock, Alfred M. Blackmer, Richard M. Cruse, Thomas S. Colvin, Ramesh S. Kanwar, U. Sunday Tim Jan 2000

Economic Analysis Of Variable Rate Management For Corn And Soybean Systems, William D. Batchelor, Bruce A. Babcock, Alfred M. Blackmer, Richard M. Cruse, Thomas S. Colvin, Ramesh S. Kanwar, U. Sunday Tim

Leopold Center Completed Grant Reports

What is the potential payoff for farmers moving from traditional whole-field management or integrated crop management to precision farming? Using computer models, the investigators sought to analyze how inputs can be applied at optimal rates variably across a field in order to match inputs with crop needs. Over the long term, only modest increases were shown in gross returns from these practices. However, gross returns for individual years can be substantial.


Gis-Based Environmental And Economic Analysis Of Integrated Crop-Livestock Production Systems In Southern Iowa, U. Sunday Tim, Robert W. Jolly, Daniel Otto Jan 1995

Gis-Based Environmental And Economic Analysis Of Integrated Crop-Livestock Production Systems In Southern Iowa, U. Sunday Tim, Robert W. Jolly, Daniel Otto

Leopold Center Completed Grant Reports

Crop and livestock production are important economic components for many rural com­ munities. In 1992, Iowa led the nation in corn and hog production, and ranked second, third, seventh, and eighth, respectively in soybean, cattle and calves, poultry, and dairy cow pro­ duction. Livestock and livestock products generated over 64% of the state's total cash farm receipts during 1992—more than $6.5 billion sales at the farm level.


A Spatial Decision Support System For Livestock Production Planning And Environmental Management, Dharmesh K. Jain, U. Sunday Tim, Robert W. Jolly Jan 1995

A Spatial Decision Support System For Livestock Production Planning And Environmental Management, Dharmesh K. Jain, U. Sunday Tim, Robert W. Jolly

Agricultural and Biosystems Engineering Publications

Spatial decision support systems are used to plan production systems and direct the implementation management strategies that are compatible with environmental protection goals. They enable resource managers to select appropriate production technologies that minimize environmental damage, and evaluate alternative management practices. This article describes a spatial decision support system (SDSS) developed to facilitate planning and management of environmentally sound livestock production. The SDSS integrates a geographic information system, spatial and biophysical modeling, and a knowledge-based system into an interactive tool to select suitable watershed land areas for siting livestock production, to select fields for manure application, and to determine the ...


Impact Of Technological Advance On Farm Family Income Inequality, Yoichiro Kawasaki Jan 1970

Impact Of Technological Advance On Farm Family Income Inequality, Yoichiro Kawasaki

Retrospective Theses and Dissertations

No abstract provided.


Economics Of The Production Of Ethanol, L. A. (Lewis Albert) Kremer Jan 1949

Economics Of The Production Of Ethanol, L. A. (Lewis Albert) Kremer

Retrospective Theses and Dissertations

The cost of producing alcohol naturally varies with the raw material and with the process. In the case of corn alcohol, the raw material charge is the major cost item; therefore, instead of selecting one cost for alcohol from corn, a graph is presented showing estimated cost of producing alcohol vs. the price of corn. The graph is a straight line showing an alcohol cost of 27 to 30 cents per gallon with corn at 40 cents per bushel and an alcohol cost of 83 to 86 cents with corn at $2.00 per bushel. Molasses alcohol is made from ...