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2023

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Full-Text Articles in Social and Behavioral Sciences

Melittological Notes From Guatemala (Hymenoptera: Anthophila), 1. New Country Records For Centris Fabricius (Apidae) And Zikanapis Moure (Colletidae), Silas Bossert, José Monzón-Sierra, Richard S. Zack, Ana Cristina García, Elizabeth A. Murray Dec 2023

Melittological Notes From Guatemala (Hymenoptera: Anthophila), 1. New Country Records For Centris Fabricius (Apidae) And Zikanapis Moure (Colletidae), Silas Bossert, José Monzón-Sierra, Richard S. Zack, Ana Cristina García, Elizabeth A. Murray

Insecta Mundi

Abstract

Three species of bees (Hymenoptera: Apidae, Colletidae) are newly recorded for Guatemala: Centris obscurior Michener, Centris vidua Mocsáry, and Zikanapis inbio (Michener, Engel and Ayala). We discuss aspects of their biology and circumstances of the collecting events and provide information on their presently known distribution.

Resumen

Se registran por primera vez tres especies de abejas (HymenopteraN: Apidae, Colletidae) para Guatemala: Centris obscurior Michener, Centris vidua Mocsáry, y Zikanapis inbio (Michener, Engel y Ayala). Discutimos aspectos de su biología, circunstancias bajo las cuáles fueron colectadas y se provee información en la distribución conocida actualmente.


A Revision Of Dyscolotaxia Horn, 1890 (Coleoptera: Eucnemidae: Macraulacinae: Macraulacini), With The Description Of Amazotaxia New Genus From South America, Robert L. Otto Dec 2023

A Revision Of Dyscolotaxia Horn, 1890 (Coleoptera: Eucnemidae: Macraulacinae: Macraulacini), With The Description Of Amazotaxia New Genus From South America, Robert L. Otto

Insecta Mundi

Abstract

The Neotropical eucnemid genus, Dyscolotaxia Horn, is revised following the examination of specimens from five collections, examination of the published original description of Plesiofornax tetratoma Chassain, and from images provided by Fernanda Salazar-Buenaño (QCAZI). Dyscolotaxia championi Horn is redescribed with included descriptions of the male genitalia and a female specimen. Three new species of false click beetles (Coleoptera: Eucnemidae) are described from the Neotropical region. These new species are: Dyscolotaxia chiriquiensis (Panama), Dyscolotaxia hispaniolensis (Dominican Republic), and Dyscolotaxia picea (Ecuador). Amazotaxia new genus is described from South America for Plesiofornax tetratoma Chassain, creating Amazotaxia tetratoma (Chassain) new combination. Morphology …


A Year Of Wins For Farmed Animals, Lewis Bollard Dec 2023

A Year Of Wins For Farmed Animals, Lewis Bollard

General – Farm Animal Issues

Although the European Union shelved its ambitious farmed animal welfare reforms, there were other “wins” for farmed animals in 2023. There were 130 new corporate pledges to eliminate cages for laying hens and the worst abuses of broiler chickens. So far, over 1,000 corporate pledges have been fully implemented, and 39% of American hens, 60% of European hens, and 80% of British hens are cage-free, up from 6%, 41%, and 48%, respectively, a decade ago. The US Supreme Court upheld California’s Proposition 12, which bans the sale of eggs, pork, and veal from caged animals and their offspring in California. …


Recognizing Power And Control When Planning Your Estate, Allan Vyhnalek Dec 2023

Recognizing Power And Control When Planning Your Estate, Allan Vyhnalek

Cornhusker Economics

The older generations have spent their entire professional lives using the power and control that they accumulated through hard work and their long tenures. Having them retire and give up that control and power is difficult for some in those generations. Overall, it is challenging for them to give up control or power.


The Influence Of Invasive Species On Fishers’ Satisfactions, Caroline M. Laplante Dec 2023

The Influence Of Invasive Species On Fishers’ Satisfactions, Caroline M. Laplante

School of Natural Resources: Dissertations, Theses, and Student Research

Invasives species are prevalent and widespread in North America. Outdoor recreational activities, such as fishing, introduce a point in which humans may interact with invasive species and have to adapt their own behaviors. Bigheaded carp in the Missouri River below Gavin’s Point Dam are a group of invasive fish species that were thought to be negatively relating to recreational fishers’ satisfactions. Using a content analysis and an importance-grid, we conclude that invasive species do not strongly relate to recreational paddlefish fishers’ satisfactions. Paddlefish fishers represent a small sub-set of recreational fishers in Nebraska and South Dakota. The content analysis revealed …


Understanding Avidities Of Recreational Activities For People Possessing Fishing Licenses And Residing In Urban Environments, Kyle F. Hansen Dec 2023

Understanding Avidities Of Recreational Activities For People Possessing Fishing Licenses And Residing In Urban Environments, Kyle F. Hansen

School of Natural Resources: Dissertations, Theses, and Student Research

Recreational fishing is one of the world's most popular pastimes, wherein participation is associated with sociodemographic factors. Even so, fishing license sales are declining in the USA in conjunction with a reduction in rural populations as people move to urban areas. Thus, urban areas are constantly growing in population size, population diversity, and geographic size suggesting a need to understand fishing participation in these growing areas. Natural resource managers often use participation to understand recreationists, yet avidity could provide a new way to understand recreationists. The goal of our study is to understand what sociodemographic factors influence the fishing avidity …


Human Dimensions Of Woody Encroachment Management In Nebraska, Emily Rowen Dec 2023

Human Dimensions Of Woody Encroachment Management In Nebraska, Emily Rowen

School of Natural Resources: Dissertations, Theses, and Student Research

Woody plant encroachment (WPE) is a social-ecological problem that will challenge conservation professionals and agricultural producers to adapt their management strategies. This research first examined WPE from the perspective of individual conservation professionals through an online survey. Conservation professionals’ attitudes about adaptation to vegetation transitions, such as WPE, were of interest because these attitudes are one measure of how prepared this group is to respond to WPE. Hypothesized predictors of adaptation attitude were tested through linear regression modeling. These predictors included ecological change, observation of WPE, or risk perception. It was found that risk perception was the strongest predictor of …


Law Library Blog (December 2023): Legal Beagle's Blog Archive, Roger Williams University School Of Law Dec 2023

Law Library Blog (December 2023): Legal Beagle's Blog Archive, Roger Williams University School Of Law

Law Library Newsletters/Blog

No abstract provided.


Landings, Vol. 31, No. 12, Maine Lobstermen’S Community Alliance, Rebecca Nuzzi, Amber-Jean Nickel Dec 2023

Landings, Vol. 31, No. 12, Maine Lobstermen’S Community Alliance, Rebecca Nuzzi, Amber-Jean Nickel

Landings: News & Views from Maine's Lobstering Community

Landings content emphasizes science, history, resource sustainability, economic development, and human interest stories related to Maine's lobster industry. The newsletter emphasizes lobstering as a traditional, majority-European American lifeway with an economic and social heritage unique to the coast of Maine. The publication focuses how ongoing research to engage in sustainable, non-harmful, and non-wasteful commercial fishing practices benefit both the fishery and Maine's coastal legacy.

For more information, please visit the Maine Lobstermen’s Community Alliance (MLCA) website.


Socioeconomic Geographies And Municipal Decision Making Of New York's Climate Smart Communities Program, Stephen Corbisiero Dec 2023

Socioeconomic Geographies And Municipal Decision Making Of New York's Climate Smart Communities Program, Stephen Corbisiero

Digital and Data Studies Student Scholarship

Nearly all of New York’s residents live in a municipality designated as a Climate Smart Community, but few are familiar with one of the state’s major legislative accomplishments. The initiative allows municipalities to earn points toward a climate smart certification by implementing sustainable technologies in their communities, which in turn makes them eligible for increased grant funding from New York State. As climate change begins to have a greater impact on human and natural life, investing in green infrastructure has never been more important. New York’s Climate Smart Communities program is widespread, but adoption rates vary greatly throughout the state …


Costs Of Wind Erosion In The Northern Agricultural Region, Anne Bennett Dec 2023

Costs Of Wind Erosion In The Northern Agricultural Region, Anne Bennett

Natural resources published reports

Summary

  • To date, the Department of Primary Industries and Regional Development’s (DPIRD) estimated opportunity cost of wind erosion for Western Australia’s (WA) agricultural region has only included the costs of forgone production income and therefore underestimates the broader costs of wind erosion events.
  • This underestimation of costs was the impetus to create a case study to give an indication of the magnitude of the costs of wind erosion from agricultural land.
  • Farmers in the Northern Agricultural Region (NAR) were contacted to seek information about the on-farm costs of wind erosion events that occurred in 2020. Seventeen farmers responded to the …


The Role Of Leaders In Implementing Effective Leadership Strategies Towards The Educational Barriers Of Us-Based Refugee Students: A Qualitative Case Study Of Congolese Refugee Students, Faustin Busane Dec 2023

The Role Of Leaders In Implementing Effective Leadership Strategies Towards The Educational Barriers Of Us-Based Refugee Students: A Qualitative Case Study Of Congolese Refugee Students, Faustin Busane

Masters Theses & Specialist Projects

This qualitative research study explored the experiences of three families of refugee school students, two school officials (a Superintendent and a Principal), three teachers, and one humanitarian agent all living in a Southeastern U.S. city. The results of the study revealed that the language barrier is the main academic challenge that refugee students encounter when they enroll in U.S. schools. The study also found that educators conceptualize their responsibilities toward refugee children by emphasizing the importance of high-quality teaching, and establishing through establishing strong relationships between parents, school officials, and exercising patience in the process. This study poses important implications …


Unraveling The Tapestry Of Indigenous Maize In North America: A Case Study Of Pawnee Ancestral Maize, Kahheetah Barnoskie Dec 2023

Unraveling The Tapestry Of Indigenous Maize In North America: A Case Study Of Pawnee Ancestral Maize, Kahheetah Barnoskie

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Studies on Indigenous ancestral landrace maize in North America has significant historical and scientific importance. Indigenous peoples, such as the Pawnee people, have been cultivating maize for thousands of years, resulting in diverse varieties adapted to their local environments. This study aims to deepen the knowledge of Indigenous maize by examining specific varieties from the Pawnee, including a comparative analysis of the genetic makeup through DNA sequencing. This study used Genotyping by Target Sequencing (GBTS) method to examine the genetic variation and characteristics among the multiple varieties the Pawnee people once grew historically, providing valuable information about the evolutionary history …


Growing Natty (Natural): A Campaign To Move Beyond Steroids And Self Harm, Charles Harris Dec 2023

Growing Natty (Natural): A Campaign To Move Beyond Steroids And Self Harm, Charles Harris

Global Strategic Communications Student Work

Steroid use is nothing new, especially among athletes in competitive sports. The drug is used to give the user an accelerated amount of strength and muscle mass, in a shorter time and often beyond the capabilities of their body's performance in its natural state. Doping is a name for it when reported about in these instances, attributed to the fall and public disgrace of some of the most celebrated sportsmen, yet has continued to be the open secret in the sporting community. The disgrace, the health risk, and the classification of anabolic steroids hasn't slowed down the trafficking or sales …


Agricultural Groundcover Update November 2023, Justin Laycock Dec 2023

Agricultural Groundcover Update November 2023, Justin Laycock

Natural resources published reports

Summary

  • About 98% of the grainbelt had adequate (more than 50%) vegetative groundcover to prevent wind erosion in November 2023. This amount of groundcover is normal for the middle of harvest.
  • In the northern half of the grainbelt, a larger-than-average area had 51–60% groundcover, which is expected to decrease to below 50% over summer.
  • Just over 2% of the grainbelt (324,000 ha) had less than 50% groundcover, which is inadequate to prevent wind erosion. Mullewa to Morawa Ag Soil Zone had the highest risk of wind erosion and 9.7% of this farmland had inadequate groundcover.
  • Less than 0.5% of the …


New Plagiosarus Bates, 1880 (Cerambycidae: Lamiinae: Acanthoderini) From Costa Rica And Notes On P. Melampus Congestus Bates, Josef Vlasak, Antonio Santos-Silva Dec 2023

New Plagiosarus Bates, 1880 (Cerambycidae: Lamiinae: Acanthoderini) From Costa Rica And Notes On P. Melampus Congestus Bates, Josef Vlasak, Antonio Santos-Silva

Insecta Mundi

Plagiosarus transversus Vlasak and Santos-Silva, new species (Cerambycidae: Lamiinae: Acanthoderini), is described from Costa Rica. The rank of Plagiosarus melampus congestus Bates, 1885 is discussed.


An Illustrated Type Catalog Of Trichodesma Leconte, 1861 (Coleoptera: Ptinidae) From Mexico, With Description Of A New Species, Kyle E. Schnepp Dec 2023

An Illustrated Type Catalog Of Trichodesma Leconte, 1861 (Coleoptera: Ptinidae) From Mexico, With Description Of A New Species, Kyle E. Schnepp

Insecta Mundi

Trichodesma nancyae, new species (Coleoptera: Ptinidae), is described from Mexico. The species is illustrated and diagnosed, bringing the total number of extant species in the genus to 73. Lectotypes for Trichodesma beyeri Fall, Trichodesma scripta Champion, and Trichodesma texana Schaeffer are here designated. Habitus and label photographs are provided for types of 12 of the 13 species occurring in Mexico.


Agriculture And Community Well-Being: A Review Of Three Research Studies., Marilyn R. Schlake Nov 2023

Agriculture And Community Well-Being: A Review Of Three Research Studies., Marilyn R. Schlake

Cornhusker Economics

Personal observations are often obscure to the facts. For instance, recently I worked at a booth at Husker Harvest Days. The booth focused on rural community development. My observations were that many of the agricultural producers decided to not stop at our booth or for those who did stop, conversations showed a disconnect of the importance of their local community to their farm operations. Similarly, when working with communities, I have observed the lack of understanding of the importance of the agricultural producers to the local community’s well-being. Why the disconnect between these two very important components of our rural …


Twelve Wallace Myths, Charles H. Smith Nov 2023

Twelve Wallace Myths, Charles H. Smith

Faculty/Staff Personal Papers

Alfred Russel Wallace’s (1823-1913) bicentennial year is a good time to take stock. In this presentation I discuss twelve Wallace-related issues that I feel have been poorly taken up. These range from the biological to the biographical, including subjects such as social criticism, human evolution, autobiographical memory, natural selection, national affinities, spiritualism, and wokeism.


Circular Food Education: Developing A Food Education Programme Based On Sustainability, Experiential Learning And Pleasure In Irish Primary Schools, Michelle Darmody Dr Nov 2023

Circular Food Education: Developing A Food Education Programme Based On Sustainability, Experiential Learning And Pleasure In Irish Primary Schools, Michelle Darmody Dr

Doctoral

This research explored how an expanded and sustained education about food within the primary school curriculum in the Republic of Ireland could be achieved. A constructivist ontology underpinned the project, with multiple theoretical frameworks related to constructivist learning and building agency, informing the study. A multi-method action research methodology was used, providing practical solutions through action, reflection, practice and theory. A narrative review of the literature and existing policy preceded three sections of fieldwork. A scoping consultation with key stakeholders was followed by the development and piloting of a food education programme entitled the Global Citizenship Food and Biodiversity Theme …


Pass-Through Entity Tax Deduction, Tina N. Barrett Nov 2023

Pass-Through Entity Tax Deduction, Tina N. Barrett

Cornhusker Economics

In 2023, the State of Nebraska became the 36th state to implement a Pass-Through Entity Tax (PTET) Deduction law. This law is in response to a change made by the federal Tax Cuts and Jobs Act of 2018 which limited the state and local tax deduction eligible for itemized deductions to $10,000. This new state law allows partnerships and s-corporations to pay the state income tax on behalf of their owners which qualifies it for a federal tax law deduction. The individuals will then receive a credit on their individual return for the tax paid on their behalf.


An Overview Of Elements And Relations: Aspects Of A Scientific Metaphysics, Martin Zwick Nov 2023

An Overview Of Elements And Relations: Aspects Of A Scientific Metaphysics, Martin Zwick

Systems Science Faculty Publications and Presentations

A talk on my book, Elements and Relations: Aspects of a Scientific Metaphysics. Book description:

This book develops the core proposition that systems theory is an attempt to construct an “exact and scientific metaphysics,” a system of general ideas central to science that can be expressed mathematically. Collectively, these ideas would constitute a non-reductionist “theory of everything” unlike what is being sought in physics. Inherently transdisciplinary, systems theory offers ideas and methods that are relevant to all of the sciences and also to professional fields such as systems engineering, public policy, business, and social work. To demonstrate the generality …


Will Nebraska Farms And Ranches Be Ready For Double Digit Operating Line Rates?, Jeffrey Stokes, Jim Jansen Nov 2023

Will Nebraska Farms And Ranches Be Ready For Double Digit Operating Line Rates?, Jeffrey Stokes, Jim Jansen

Cornhusker Economics

For those involved in agriculture, it has been quite a while since interest rates on farm real estate, equipment, and operating lines have been as high as they are for the industry. As the fall harvest winds down and producers focus on next year, interest rates on operating lines may cause shock. It has been over 20 years since interest rates on operating lines exceeded 10%. To better understand what may be causing interest rates on operating lines to rise, it will be beneficial to understand some basic monetary policy tools the Fed has at its disposal. The tool receiving …


Landings, Vol. 31, No. 11, Maine Lobstermen’S Community Alliance, Rebecca Nuzzi, Amber-Jean Nickel, Bob Steneck, Melissa Waterman, Patrice Mccarron, Kevin Kelley, Marcus Wolf, Paul Molyneaux Nov 2023

Landings, Vol. 31, No. 11, Maine Lobstermen’S Community Alliance, Rebecca Nuzzi, Amber-Jean Nickel, Bob Steneck, Melissa Waterman, Patrice Mccarron, Kevin Kelley, Marcus Wolf, Paul Molyneaux

Landings: News & Views from Maine's Lobstering Community

Landings content emphasizes science, history, resource sustainability, economic development, and human interest stories related to Maine's lobster industry. The newsletter emphasizes lobstering as a traditional, majority-European American lifeway with an economic and social heritage unique to the coast of Maine. The publication focuses how ongoing research to engage in sustainable, non-harmful, and non-wasteful commercial fishing practices benefit both the fishery and Maine's coastal legacy.

For more information, please visit the Maine Lobstermen’s Community Alliance (MLCA) website.


Experimental Studies On The Operation Of Agricultural Crops Mowing Unit With Simultaneous Chopping And Incorporation Of Stubble Into The Soil, Volodymyr Nadykto, Sergey Kiurchev, Tatiana Chorna, Taras Hutsol, Szymon Głowacki, Anatoliy Rud, Alona Shevtsova, Igor Ryabov, Katarzyna Szwedziak Nov 2023

Experimental Studies On The Operation Of Agricultural Crops Mowing Unit With Simultaneous Chopping And Incorporation Of Stubble Into The Soil, Volodymyr Nadykto, Sergey Kiurchev, Tatiana Chorna, Taras Hutsol, Szymon Głowacki, Anatoliy Rud, Alona Shevtsova, Igor Ryabov, Katarzyna Szwedziak

Sociology Faculty Publications and Presentations

For harvesting crops, one-phase and two-phase methods are most often used. When implementing the second one, mounted and trailed units are used. The latter is becoming less and less used due to the problems with movement stability in the horizontal plane because of the asymmetric layout. A stubble background, which is susceptible to solar and wind influences, is formed as a consequence of application of the mounted harvesting unit, As a result, the field’s soil in the inter-swath space intensively loses moisture. A harvesting unit based on a tractor with rear steerable wheels has been designed to eliminate this shortcoming. …


Agricultural Groundcover Update October 2023, Justin Laycock Nov 2023

Agricultural Groundcover Update October 2023, Justin Laycock

Natural resources published reports

Summary

  • About 98% of the grainbelt had adequate vegetative groundcover (more than 50%) to prevent wind erosion in October 2023. This amount of groundcover is normal at the end of spring and pre-harvest in most areas.
  • There was a larger than average area with 51–60% groundcover, and groundcover in these areas is expected to reduce over summer to below 50%.
  • About 2% of the grainbelt (293,000 ha) had less than 50% groundcover, which is inadequate to prevent wind erosion. Mullewa to Morawa Ag Soil Zone had the highest risk of wind erosion and 8% of this farmland had inadequate groundcover. …


Students' Attitudes Towards Animals Influences Youth Development Constructs Based On Interactions With Different Animal Species Prior To College, Allison K. Pachunka Nov 2023

Students' Attitudes Towards Animals Influences Youth Development Constructs Based On Interactions With Different Animal Species Prior To College, Allison K. Pachunka

Department of Animal Science: Dissertations, Theses, and Student Research

Human-animal interactions (HAI) are commonplace in society and play a consequential role in a variety of situations such as companion animal ownership, agriculture, or youth programs such as 4-H or FFA. Interacting with animals has been shown to provide developmental benefits to children. Positive youth development (PYD), measured by the Five Cs Model, is a framework that focuses on fostering youth’s potential through positive activities which has been studied specifically in 4-H. However, this framework has not been applied to other organizations such as the National FFA Organization (FFA) or to other young adults with less formal interactions with animals. …


Mosaic Chromosomal Alterations In Blood Across Ancestries Using Whole-Genome Sequencing, Yasminka A Jakubek, Ying Zhou, Adrienne Stilp, Jason Bacon, Justin W Wong, Zuhal Ozcan, Donna Arnett, Kathleen Barnes, Joshua C Bis, Eric Boerwinkle, Jennifer A Brody, April P Carson, Daniel I Chasman, Jiawen Chen, Michael Cho, Matthew P Conomos, Nancy Cox, Margaret F Doyle, Myriam Fornage, Xiuqing Guo, Sharon L R Kardia, Joshua P Lewis, Ruth J F Loos, Xiaolong Ma, Mitchell J Machiela, Taralynn M Mack, Rasika A Mathias, Braxton D Mitchell, Josyf C Mychaleckyj, Kari North, Nathan Pankratz, Patricia A Peyser, Michael H Preuss, Bruce Psaty, Laura M Raffield, Ramachandran S Vasan, Susan Redline, Stephen S Rich, Jerome I Rotter, Edwin K Silverman, Jennifer A Smith, Aaron P Smith, Margaret Taub, Kent D Taylor, Jeong Yun, Yun Li, Pinkal Desai, Alexander G Bick, Alexander P Reiner, Paul Scheet, Paul L Auer Nov 2023

Mosaic Chromosomal Alterations In Blood Across Ancestries Using Whole-Genome Sequencing, Yasminka A Jakubek, Ying Zhou, Adrienne Stilp, Jason Bacon, Justin W Wong, Zuhal Ozcan, Donna Arnett, Kathleen Barnes, Joshua C Bis, Eric Boerwinkle, Jennifer A Brody, April P Carson, Daniel I Chasman, Jiawen Chen, Michael Cho, Matthew P Conomos, Nancy Cox, Margaret F Doyle, Myriam Fornage, Xiuqing Guo, Sharon L R Kardia, Joshua P Lewis, Ruth J F Loos, Xiaolong Ma, Mitchell J Machiela, Taralynn M Mack, Rasika A Mathias, Braxton D Mitchell, Josyf C Mychaleckyj, Kari North, Nathan Pankratz, Patricia A Peyser, Michael H Preuss, Bruce Psaty, Laura M Raffield, Ramachandran S Vasan, Susan Redline, Stephen S Rich, Jerome I Rotter, Edwin K Silverman, Jennifer A Smith, Aaron P Smith, Margaret Taub, Kent D Taylor, Jeong Yun, Yun Li, Pinkal Desai, Alexander G Bick, Alexander P Reiner, Paul Scheet, Paul L Auer

Journal Articles

Megabase-scale mosaic chromosomal alterations (mCAs) in blood are prognostic markers for a host of human diseases. Here, to gain a better understanding of mCA rates in genetically diverse populations, we analyzed whole-genome sequencing data from 67,390 individuals from the National Heart, Lung, and Blood Institute Trans-Omics for Precision Medicine program. We observed higher sensitivity with whole-genome sequencing data, compared with array-based data, in uncovering mCAs at low mutant cell fractions and found that individuals of European ancestry have the highest rates of autosomal mCAs and the lowest rates of chromosome X mCAs, compared with individuals of African or Hispanic ancestry. …


Notes From The Brazilian Cornfields, Fabio Mattos Nov 2023

Notes From The Brazilian Cornfields, Fabio Mattos

Cornhusker Economics

In the last few months, I have been traveling in Brazil. My objective with this trip is to meet with industry professionals, government officials, and academic researchers to learn about recent developments in Brazilian agriculture and what we can expect to see in the future. I have essentially been asking people their opinions about the main developments in Brazil in the last few years and their perspectives for the future. One of the main topics that has emerged consistently in these conversations is, not surprisingly, the corn market.


Diesel Tractor Fuel Efficiency And Exhaust Emissions Standards, Jerin Tekolste, Cory Walters, Michael Mccullough, Lynn Hamilton, Lia Nogueira, Roger M. Hoy Oct 2023

Diesel Tractor Fuel Efficiency And Exhaust Emissions Standards, Jerin Tekolste, Cory Walters, Michael Mccullough, Lynn Hamilton, Lia Nogueira, Roger M. Hoy

Cornhusker Economics

Diesel engine performance and costs represent crucial factors for agricultural producers while pollutants from the exhaust are largely a social concern but also important to producers. Beginning in 1970, Congress authorized the Environmental Protection Agency to regulate emissions with amendments in subsequent years (U.S. EPA, 2023). In 1996 the EPA issued strict Exhaust Emission Standards for Nonroad Compression-Ignition Engines, causing a major paradigm shift in acceptable emission levels. A primary concern coming from many manufacturers was the difficulty of designing an engine to meet these standards without compromising the engines’ power output and efficient fuel consumption (Lloyd and Cackette 2001; …