Digital Commons Network^™

Increasing The Agronomic And Economic Value Of Chickpea And Pea, Edward Marques

Graduate College Dissertations and Theses

Domestication has had a profound global impact on human history and a wide range of plants. Understanding the advertent and inadvertent effects of domestication on crops has been instrumental in bolstering food security efforts. For instance, by identifying and re-incorporating lost genotypic variation due to domestication, we can increase crop tolerance to biotic and abiotic stressors. With changing climatic conditions and the ever-growing human population, it has become more imperative to increase and fortify agricultural production. My dissertation addresses this topic in two agronomically important legumes: chickpea (Cicer arietinum) and pea (Pisum sativum). My research aims to increase the agronomic …

The Agronomics Of Organically Managed Legume-Grass Mixtures For Ensiled Forage Production, Allen Wilder

Graduate College Dissertations and Theses

Legume-grass mixtures are commonly grown on livestock farms in northern New England that feed high forage diets. Such farms typically ferment stored feed into silage that can be fed throughout the year. Many legumes and grass species are available for use in temperate climates and information on the yield, forage quality, and fermentation characteristics of various legume-grass combinations would help farmers make informed decisions about species selection and optimum management for their forage programs.

One obstacle to evaluating numerous forage treatments in agronomic research is the high variability in silage dry matter content. We hypothesized that a method of artificial …

Does Adding Forage Radish Enhance Winter Rye Cover Crops In Northeastern Corn Silage Systems?, Kirsten Cynthia Workman

Graduate College Dissertations and Theses

Cover crops play an important role in decreasing erosion and nutrient runoff associated with corn silage production in northern New England. Winter rye (Secale cereal L.) is the primary cover crop species used in this region. While winter rye (rye) monocultures are easily established, they can be challenging to manage in the spring, expensive to establish at recommended seeding rates, and can interfere with the planting of subsequent corn crops. We hypothesized that adding forage radish (Raphunus sativus L.) to a rye cover crop could augment fall performance and enhance the ecosystem services provided by the cover crop and allow …

From Tap To Table: Consumer Values, Producer Attitudes, And Vermont Maple Syrup In A Dynamic Landscape, Aidan Conor Mccracken

Graduate College Dissertations and Theses

Harvesting the sap of maple trees [Acer saccharum] for use in the production of syrups and sugars has a storied history stretching back to the pre-Columbian practices of North America’s indigenous peoples. Since its adaptation by European settlers in the late seventeenth century and into the present day, the production of maple syrup has become especially integral to the livelihoods and cultural identities of farmers in Vermont. While oftentimes esteemed as a timeless agrarian tradition, market forces and environmental changes have led maple syrup producers (or sugarmakers) to adopt new production practices that scarcely resemble the taps, buckets, and draft …

Farm Fresh Food Boxes, Lauren Greco

Graduate College Dissertations and Theses

In response to trends that challenge food access, farmer livelihoods and public health, several market and social institutions have pursued the development of alternative food systems (AFS). These attempt to support the production and distribution of foods with important qualities, such as attention to specific growing practices, higher worker standards, superior product quality and taste, support for environmental health and farmer well-being (Valchuis et al. 2015). While there has been some success in these efforts, as evidenced by the growth of farmers’ markets, community supported agriculture programs, and farm-to-institution relationships, growth in direct to consumer markets has flattened in recent …

Local Farmer Knowledge Of Adaptive Management On Diversified Vegetable And Berry Farms In The Northeastern Us, Alissa White

Graduate College Dissertations and Theses

Agricultural adaptation to climate change is notoriously context specific. Recently updated projections for the Northeastern US forecast increasingly severe and erratic precipitation events which pose significant risks to every sector of agricultural production in the region. Vegetable and berry farmers are among the most vulnerable to the risks of severe precipitation and drought due to the intensive soil and crop management strategies which characterize of this kind of production. To successfully adapt to a changing climate, these farmers need information which is tailored for the unique challenges of vegetable and berry production, framed at the level of climate impacts, and …

An Environmental Approach To Food Safety Assessment Using Artisan Cheese And Fresh Produce As Model Systems, Marie Limoges

Graduate College Dissertations and Theses

This dissertation examined recently issued regulatory standards using cheese and produce as model systems. FDA's 2015 Domestic and Imported Cheese and Cheese Products Compliance Program Guidelines (CPG) E. coli standards on cheese safety, and the extent to which these standards affect domestic and imported cheese commerce, was assessed. Results from FDA's Domestic and Imported Cheese Compliance Program for samples collected between January 1, 2004 and December 31, 2006 were analyzed. Of 3,007 cheese samples tested for non-toxigenic E. coli, 76% (2,300) of samples exceeded 10/g, FDA's target for regulatory activity. In cheese samples containing E. coli levels of 10/g and …

Modeling Agricultural Outcomes In A Warmer, Wetter Vermont, Rachel Mason

Graduate College Dissertations and Theses

This thesis aimed to model agricultural outcomes that are important to Vermont dairy farms and their surrounding communities -- runoff, erosion, nitrogen and phosphorus losses, crop yields, and timeliness of farm operations -- under a set of possible future climates. The Agricultural Policy/Environmental eXtender (APEX) model was used for this work, and the models were calibrated using data from a project that measured most of these outcomes on a set of local farms. The model setup and calibration methodology is thoroughly documented and may be a useful starting point for others who are new to agricultural modeling.

Applied to two …

Residual Soil Phosphorus In Tropical Oxisols: An Opportunity To Enhance Fertilizer Use Efficiency?, Lauren Bomeisl

Graduate College Dissertations and Theses

Phosphorus (P) is essential to life on Earth and often the limiting nutrient in agricultural systems. P fertilizer is thus an essential resource to maintain food security. In the last half century, agricultural intensification has led to an increase in P fertilizer consumption from 4.6 to 17.5 Tg of P/year to meet rising global food demand. Mineral P (i.e., phosphate rock) is a non-renewable resource in the context of the Anthropocene, and its price is vulnerable to global market fluctuations. Increased efficiency of P use on farms is considered the most effective strategy to conserve P. The soybean industry demands …

Mitigating Gaseous Nitrogen And Carbon Losses From Northeastern Agricultural Soils Via Alternative Soil Management Practices, Kyle Michael Dittmer

Graduate College Dissertations and Theses

Traditional agricultural practices often result in gaseous losses of nitrous oxide (N2O), ammonia (NH3), and carbon dioxide (CO2), representing a net loss of nutrients from agricultural soils, which negatively impacts crop yield and requires farmers to increase nutrient inputs. By adopting best management practices (BMPs; i.e., no-tillage, cover crops, sub-surface manure application, and proper manure application timing), there is great potential to reduce these losses. Because N2O and CO2 are also greenhouse gases (GHGs), climate change mitigation via BMP adoption and emissions reductions would be an important co-benefit. However, adopting a no-tillage and cover cropping system has had setbacks within …

Examination Of Bovine Rumen Fluid And Milk Fat Globule Membrane Proteome Dynamics, Mallory Cate Honan

Graduate College Dissertations and Theses

Proteomic technology has been increasingly incorporated into agricultural research, as characterization of proteomes can provide valuable information for potential biomarkers of health and physiological status of an animal. As dairy cattle are a dominant production animal in the USA, their biofluids such as milk, blood, urine, and rumen fluid have been examined by proteomic analysis. The research outlined herein was performed to further characterize the dynamics of specific proteomes and relate them to dairy cattle physiology.

The first experiment evaluated the diurnal dynamicity of the rumen metaproteome in Holstein dairy cattle. Rumen fluid was collected from three mid to late …

Organic Dairy Profitability In Vermont: Measuring The Impacts Of Management And Market Forces On Farm Financial Performance, Jonathan Patrick Walsh

Graduate College Dissertations and Theses

The total number of operating dairy farms in the US has decreased by 74.1% over the past 25 years, dropping from 155,339 in 1992 to just 40,219 in 2017. As milk prices have fallen and become more volatile, profit margins have tightened, causing farmers to leave the business due to low profitability. Some Vermont farmers are currently looking for new economic strategies. One approach has been to transition from conventional to organic production in order to take advantage of better prices and new market opportunities. In order to make production decisions, farmers need accurate financial information on the costs and …

Repelling Contarinia Nasturtii (Diptera: Cecidomyiidae), A Brassica Specialist, Using Non-Host Essential Oils, Chase Stratton

Graduate College Dissertations and Theses

Swede midge, Contarinia nasturtii Kieffer (Diptera: Cecidomyiidae), is an invasive pest causing marketable losses on Brassica crops in the Northeastern United States and throughout southern Canada. Heading brassicas, like cauliflower and broccoli, are particularly susceptible because larvae feed concealed inside meristematic tissues of the plant, where head formation occurs. Our work details the development of a sustainable, affordable pest management tactic for swede midge – plant derived repellents.

First, it was necessary to establish both a damage and marketability threshold for swede midge, so we developed a technique to manipulate larval density of swede midge on cauliflower, We asked: (1) …

Comprehensive Farm-To-School: A Mixed-Methods Case Study Of The Classroom, Cafeteria, And Community, Suzanna Elkin

Graduate College Dissertations and Theses

Farm-to-school (FTS) programs are supported at federal, state, and local levels as a cross-sectoral intervention to curb rising levels of obesity, strengthen local food systems, and improve school climate and academic outcomes. Comprehensive FTS programming, according to the “3-C” approach embraced by leaders in the FTS movement, includes interventions in three domains: the cafeteria, classroom, and community. FTS programming in these domains may include procurement of local food; school gardens; and education related to food, agriculture, and nutrition. Existing research supports the comprehensive FTS approach, illustrating that multi-component programs with strategies that are integrated across these environments improve outcomes for …

Evaluation Of Candidate Pheromone Blends For Mating Disruption Of The Invasive Swede Midge (Contarinia Nasturtii), Elisabeth Ann Hodgdon

Graduate College Dissertations and Theses

Swede midge (Contarinia nasturtii, Diptera: Cecidomyiidae) is a small invasive fly that is currently threatening Brassica vegetable and oilseed production in the Northeastern U.S. and Canada. Larvae feed on plant meristems, resulting in deformed leaves, stems, and heads. Extremely low damage thresholds for heading Brassica vegetables, multiple overlapping generations, and lack of effective organic insecticide options present serious challenges for managing this pest. Pheromone mating disruption (PMD), which involves confusing male insects with unnaturally large doses of sex pheromones, is particularly promising for swede midge management because it prevents mating and subsequent oviposition. One major challenge to PMD for swede …

Governing Water Quality Limits In Agricultural Watersheds, Courtney Ryder Hammond Wagner

Graduate College Dissertations and Theses

The diffuse runoff of agricultural nutrients, also called agricultural nonpoint source pollution (NPS), is a widespread threat to freshwater resources. Despite decades of research into the processes of eutrophication and agricultural nutrient management, social, economic, and political barriers have slowed progress towards improving water quality. A critical challenge to managing agricultural NPS pollution is motivating landowners to act against their individual farm production incentives in response to distant ecological impacts. The complexity of governing the social-ecological system requires improved understanding of how policy shapes farmer behavior to improve the state of water quality. This dissertation contributes both theoretically and empirically …

Consumer Support For Renewable Energy Systems: A Case Study Of Community Biodigesters In Vermont, Katelynn Maria Conedera

Graduate College Dissertations and Theses

From the steady rise in dairy farm closures to concerns over algae blooms in Lake Champlain, Vermont’s dairy industry is facing a multitude of challenges. While many potential solutions have been proposed, this study focuses specifically on community anaerobic digester systems (CADS) to aid in manure management, help to mitigate runoff, produce renew energy, and even provide an alternative revenue source to participating farms. CADS technology converts the gas emissions from manure and other organic substances into biogas through a process called anaerobic digestion. Unlike traditional on-farm biodigesters, which are often only financially viable for the largest dairy farms, CADS …

On The Application Of Computational Modeling To Complex Food Systems Issues, Serge William Wiltshire

Graduate College Dissertations and Theses

Transdisciplinary food systems research aims to merge insights from multiple fields, often revealing confounding, complex interactions. Computational modeling offers a means to discover patterns and formulate novel solutions to such systems-level problems. The best models serve as hubs—or boundary objects—which ground and unify a collaborative, iterative, and transdisciplinary process of stakeholder engagement. This dissertation demonstrates the application of agent-based modeling, network analytics, and evolutionary computational optimization to the pressing food systems problem areas of livestock epidemiology and global food security. It is comprised of a methodological introduction, an executive summary, three journal-article formatted chapters, and an overarching discussion section.

Chapter …

The Vermonter's Guide To The Farm Bill, Olivia A. Peña

Food Systems Master's Project Reports

The Farm Bill is a comprehensive set of laws and programs that dictates United States policies across the food system. While it may seem that a farm bill is only related to agriculture, this legislation, in reality, includes a broad set of policies on food production, nutrition assistance, rural community development, research, the environment, international trade, and more. Often known as a farm and food bill, the legislation impacts food systems stakeholders, including those who farm, live in a rural community, and even those who eat food—so that is everyone.

Considering the widespread impacts of the Farm Bill, it is …

Direct Farm-To-Institution Marketing: The Common Challenges And Keys To Success Of Northeast Producers, Chloe E. Boutelle

Food Systems Master's Project Reports

This research discovers what are the shared barriers Northeast producers engaged in the institutional market consistently face and what enables them to establish, maintain and strengthen a sales relationship with institutions. The findings can help producers understand the challenges and opportunities, how and when to approach, and provide strategies to enhance their success with the institutional market. The research concludes with implications for non-grower farm-to-institution stakeholders.

The common challenges producers faced in establishing, maintaining and strengthening institutional sales relationships included buyers who focus on low price points, uncommitted buyers, food service management companies, demand for processed products and laws and …

Agency And Empowerment On Women-Owned Farms: A Vermont Agricultural Case Study, Caroline R. Putscher

Food Systems Master's Project Reports

When examining data from the most recent US Census of Agriculture (2012), I noticed a distinct imbalance between the percentages of male and female farmers, both in the country and in Vermont. Sales from women-owned farms represent only 3.3 percent of the total of U.S. agricultural sales, and in Vermont, women were the principal operators of 22.38 percent of farms. I wanted to examine the factors that led to these imbalances, and also understand from women farmers themselves what strategies they used to overcome these obstacles. The theories of agency and empowerment can be used in explaining women’s inequality in …

Governing Environmental And Economic Flows In Regional Food Systems, Michael Bishop Wironen

Graduate College Dissertations and Theses

Globalization, specialization, and intensification have transformed the global food system, generating material flows and impacts that span multiple scales and levels, presenting novel governance challenges. Many argue for a transition toward a sustainable food system, although the scope and specific goals are fiercely contested. Theory and method is needed to evaluate competing normative claims and build legitimacy.

In this dissertation Vermont serves as a case study to investigate how environmental and economic flows impact regional governance, focusing on efforts to manage agricultural phosphorus to achieve water quality goals. A material flow account is developed to estimate phosphorus flows embedded in …

Genotypes And Phenotypes Of Staphylococci On Selected Dairy Farms In Vermont, Robert Mugabi

Graduate College Dissertations and Theses

The genus Staphylococcus contains at least 47 species and 23 subspecies. Bacteria in this genus are ubiquitous; many are commensals on human and animal skin and can be opportunistic pathogens. In dairy cattle, staphylococci are the leading cause of intramammary infections (IMI) and mastitis. Mastitis is the inflammation of the mammary gland, and is one of the leading infectious diseases causing production losses in the dairy industry. Based on the ability to clot blood plasma in vitro, members of the genus can be divided into two groups: coagulase positive staphylococci (CPS) and coagulase negative staphylococci (CNS). In the dairy industry, …

Labor On Vermont Dairy Farms: A Producer Perspective, Emily Irwin

Graduate College Dissertations and Theses

To compete with larger, more efficient dairy farms, build resilience against increasingly volatile milk prices, and increase farm income, farms in traditional dairy states such as New York, Wisconsin, and Vermont, have been forced to expand their herds and increase production. Many dairy farmers do not have formal training in human resources management, and find the transition to a larger, non-family workforce to be challenging. In addition, farmers who have transitioned to a primarily Latinx workforce also face considerable cultural and language barriers. The quality of human resource management can have a significant impact on a farm business, and evidence …

"Teamwork Makes The Dream Work": Investigating The Impact Of Social Capital In The Tampa Bay, Fl Community Food System, Monica Petrella

Graduate College Dissertations and Theses

The research in this thesis investigates the relationship between social capital and the ability of a community food system (CFS) to contribute to broad community development goals. Social capital is understood to be an intangible resource that proliferates from strong relationships stocked with trust, reciprocity, and cohesiveness.

This research presents a journey through the literature to provide an overview of community food systems, the anticipated benefits that can result from adequate expansion, and how the concept of "embeddedness" contributes to development between the CFS and the community at large. The concept of social capital is introduced and discussed as previous …

An Autothermal, Representative Scale Test Of Compost Heat Potential Using Geostatistical Analysis, William J. Mccune-Sanders

Graduate College Dissertations and Theses

Composting has been practiced for thousands of years as a way of stabilizing and recycling organic matter into useful soil amendments. Thermophilic compost releases significant amounts of heat at temperatures (~140 °F) that are useful for environmental heating or process water. This heat has been taken advantage of in various ways throughout history, but development of a widely adopted technology remains elusive.

The biggest barrier to adoption of compost heat recovery (CHR) systems is projecting accurate, attractive economic returns. The cost of transfer equipment is significant, and with variability in composting substrates and methods, it is difficult to predict the …

Enhancing The Efficacy And Thermotolerance Of Selected Beauveria Bassiana Isolates For Management Of Sunn Pest, Eurygaster Integriceps, Using Electrofusion Techniques, Agrin Davari

Graduate College Dissertations and Theses

Sunn Pest, Eurygaster integriceps Puton (Heteroptera: Scutelleridae), is a major pest of wheat and barley in West and Central Asia and East Europe. The insect causes a significant reduction in yield and quality of grains. Entomopathogenic fungi, especially Beauveria bassiana are among the most dominant microbial agents that have been used against Sunn Pest. However, there are concerns related to their efficacy and thermotolerance particularly in countries with high temperature regimes.

Nine B. bassiana isolates were tested against Sunn Pest to estimate their virulence and speed of infection under laboratory conditions. The isolates were also exposed to 25, 36, 38 …

Can Urban And Peri-Urban Agriculture Create Food Sovereign Communities? Case Studies In Cuba And Burlington, Vt, Bennett Lafond

Graduate College Dissertations and Theses

Case studies from Cuba's Urban and Peri-Urban agriculture (UPA) revolution show that urban growing can fuel locally driven production of essential foods with minimal inputs, creating unprecedented opportunities for community food sovereignty. The fact that Cuba produces 60-70% of its vegetable needs on 25% of the land shows that the barriers that UPA faces are more sociopolitical than agronomic. As an agricultural hub with an abundance of rural land within close proximity of the city, the need for UPA in Burlington, VT may not be as readily apparent. When compared to nearby small vegetable growers through the lens of a …

Fibrolytic Enzymes And Silage Inoculants To Improve The Nutritive Value Of Silage, Salvador Ordaz

Graduate College Dissertations and Theses

Ensiling is one of the most common processes used as a conservation method for forages on farms and plays an important role in farm economics. Therefore, with the aim to improve the conservation and the nutritive value of silage, the utilization of silage additives such as fibrolytic enzymes (FE) and lactic acid bacteria (LAB) inoculants has been a common on-farm practice. FE are enzymes capable of breaking down complex polysaccharides such as cellulose and hemicellulose. The latter results in an increased substrate availability for epiphytic and inoculated LAB during silage fermentation, thus promoting a higher production of organic acids such …

Conceptualizing And Measuring Food Security Among Resettled Refugees Living In The United States, Hannah Stokes

Graduate College Dissertations and Theses

Food security research with resettled refugees in the United States and other Global North countries has found alarmingly high rates of food insecurity, up to 85% of surveyed households. This is well above the current US average of 12.7%. However, the most common survey tool used to measure food security status in the US, the US Household Food Security Survey Module (HFSSM), has not been sufficiently validated for resettled refugee populations, leading to the risk that the HFSSM may actually be underestimating the prevalence of food insecurity among resettled refugees in the US. Though research has attempted to establish validity …