Browsing by Subject "Agriculture"
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Item Open Access A Farm-to-School Program Review and Implementation Guide for North Carolina Public School Parents Case Study: E.K. Powe Elementary School | Durham, North Carolina(2010-04-29T18:56:58Z) Shoecraft, KellynFarm to School is a phrase used to describe programs that connect locally-grown foods to schools (Farm to School, 2009). The medium that provides this connection varies, but it is typically made through school gardens, farm field trips, nutrition and culinary education, or serving local foods in the school meals program. Farm to School programs are implemented to provide students with a hands-on learning environment and experiential education, to increase the nutritional quality of food served to students and the amount of time students spend outdoors, and to teach students about the agricultural heritage of their region, among other features. Four approaches are typically utilized in North Carolina and other states to institute Farm to School program: (1)The North Carolina Farm to School Program; (2) Local purchasing through contracted produce vendors; (3) Individual school initiatives; (4) District-wide initiatives. The method that a school or school district uses to implement a Farm to School program depends heavily on stakeholder commitment, funding opportunities, and the support of the school community and the district’s Child Nutrition Services. In this project I have evaluated these four approaches to Farm to School programs, using examples in three North Carolina counties: Durham, Guilford and Wake, and one North Carolina City: Asheville. As a corollary case study, I documented my experiences working with stakeholders from E.K. Powe Elementary School in Durham, North Carolina as they worked to implement a Farm to School program during the 2009-2010 school year. In short, I evaluate Farm to School programs state-wide and determine the strengths, weaknesses, opportunities and threats of each program. Further, I describe a formative process in Durham and use this experience in conjunction with my research to create a Farm to School implementation guide geared to North Carolina public school parents.Item Open Access A multilevel model of field-scale nitrogen export from agricultural areas(2010-04-27T00:00:30Z) Jones, PhillipAgricultural lands contribute significant nitrogen loads to surface waters. Excessive nitrogen input leads to eutrophication, the process by which aquatic ecosystems become nutrient rich. Eutrophication is associated with a wide range of undesirable changes, including shifts in physical and chemical states, changes in species composition, and the loss of ecosystem services. In agricultural areas, excessive nutrient loading is addressed through the implementation of Best Management Practices (BMPs). However, field-scale nutrient export is controlled by a complex array of interacting factors that operate at different spatial scales. Multilevel regression is a statistical technique that allows for the exploration of group-level factors that may explain variation in the overall model coefficients. In this study, multilevel regression models for dissolved and particulate nitrogen loading are fit to USDA agricultural data. The results indicate that the impact of management practice depends on the form of nitrogen as well as predictors such as soil texture that operate on large spatial scales. Specific management recommendations include soil nitrogen testing and the use of conservation measures that address water runoff. Management applications of the fitted models include load estimation as part of watershed leveling modeling efforts as well as the evaluation of proposed policy guidelines for nutrient control.Item Open Access A PRICING MODEL AND ENVIRONMENTAL IMPACT ANALYSIS FOR MANURE-BASED BIOCHAR AS A SOIL AMENDMENT(2018-04-27) Bushell, AmandaThis document explores the environmental and market opportunity for manure-based char (MBC) to be used as an agricultural soil amendment product. Biochar is a product with multiple environmental and financial benefits to farmers. Current products on the market are made from plant-based feedstocks and are priced with little consistency; the lowest market price is $50/ton, and the highest is $5000/ton with an average global price of $2200/ton (Jerka and Thayer, 2013). A new product is being developed by a gasification company utilizing manure feedstocks for a product that is highly differentiated from other chars. In this report, I discuss the price and market opportunity for manure-based biochar as a soil amendment in California. In the first section, I discuss the environmental challenges that are relevant to gasification and biochar application. These challenges include manure management, soil degradation, water-use and fertilizer use for crop and livestock farming in the United States. In the next section, the technology, business model, and location of application are explored. Then, I discuss the alternative applications for biochar and the differences between plant-based char and manure-based char as well as the farmer willingness to adopt biochar. I then use a breakeven analysis to find a minimum viable price for the biochar and a value-based pricing model to determine an appropriate target price in early years of adoption. In the breakeven analysis, I find that the minimum price for biochar that allows gasification to be profitable is $383 per ton to achieve a debt service coverage ratio of 1.00x and $485/ton to maintain a DSCR of 1.25x. The economic value-added analysis finds that a dairy feedstock could achieve a market price between $388-688 and a blended feedstock could achieve a market price between $422-722 depending on market conditions for the closest competitor, plant-based char. In the final section of the report, I conduct interviews with farmers about water and fertilizer-use as well as willingness to adopt biochar. Based on farmer interviews, I recommend that the company sell the product at $485 per ton. I also suggest that the company focuses on indoor agriculture producers who are price insensitive and then vineyard managers whose water and nutrient needs align with the attributes of the char. Finally, I recommend that the company collaborate with respected academic institutions and extension services to continue research trials and gain credibility with farmers in California. The document will be submitted in partial fulfillment of the requirements for the Master of Environmental Management degree in the Nicholas School of the Environment of Duke University to be made available to the public and will be shared with the company developing the technology to aid in market development.Item Open Access A Ripe Future? Coastal Climate Perceptions and Adaptations among the Long Island Wine Industry(2017-04-28) Hall, EmilyCoastal climates have distinctive effects on the growth, quality, and quantity produced of wine grapes. A changing coastal climate could alter these interactions and impact regional wine style and variety. There is a need to understand how growers and wine makers are perceiving and responding to climate change to inform future adaptation strategies. To explore this topic, those in the wine industry on the Eastern End of Long Island, NY were interviewed regarding their perception of 1) how the maritime climate affects viticulture, 2) how that interaction has changed/may change in the future, 3) how they will adapt, and 4) how viticulture affects the local environment. The maritime climate has the perceived effects of moderating land temperature, inducing humidity, and featuring unpredictable weather such as hurricanes and coastal storms. Most respondents believe that the maritime climate has changed over time, allowing for higher quality wine but also greater environmental risk. Industry professionals don’t see extensive adaptation methods as necessary yet, but do seek to utilize sustainable and vigilant vineyard practices to enhance resilience in times of greater risk and uncertainty.Item Open Access Adoption of Conservation Agriculture in Malawi(2008-12-05T16:40:03Z) Williams, JosephThere is need in Malawi to increase agricultural yields to feed the growing population. Concurrently, conventional agriculture techniques practiced by subsistence farmers steady depletes soil fertility thereby reducing the potential yield on the arable land. The practice of conservation agriculture may be a solution for rural farmers to improve the long-term soil health as well as increase yields and buffer potential losses due to drought, problems with the fertilizer import market and farmer health. The non-governmental organization Total Land Care, LLC, with support from the United States Agency for International Development, manages the Chia Lagoon Project in the Nkhotakota and Ntchisi districts of Malawi. One part of this project teaches conservation agriculture and has had extraordinarily successful results—project managers have documented high yields, farmer involvement and requests from other farmers to be part of this project component. This Masters Project involved a survey of conservation agriculture farmers in the Chia Lagoon Project to address the question of what indicators project managers should address in future conservation agriculture projects. The survey included questions on demographic information, agricultural practices and results, interaction with the Chia Lagoon Project, family and social relationships, and future agricultural plans. The results found farmers required less labor in terms of time and greater profitability by practicing conservation agriculture. In fact, 82% of farmers indicated they would continue to practice conservation agriculture after the project has ended. A statistical classification model (CART) estimated leading indicators of adopting conservation agriculture after the project had ended, which was found to be the frequency of visits from agricultural extension agents. The implications of these results are project managers should ensure adequate extension agent interaction for farmers in the conservation agriculture program. This practice will produce greater yields for farmers and require less time and work intensity than conventional agriculture. The time savings from these practices is particularly welcome to farmers with HIV or malaria. Conservation agriculture should be officially adopted by the Malawian government as the form of agriculture taught by extension agents. Private industry and non-governmental organizations should work in cooperation with the government to spread this technology efficiently throughout the country.Item Open Access Agricultural Drivers of Children’s Nutrition and Food Security in Mvomero, Tanzania(2017-04-26) Lamy, JenniferThe main research question assessed in this paper is: What land use and agricultural practices most significantly influence nutritional and food security outcomes? In particular, are there specific crop growing or selling or irrigation practices that, when performed by a household, help to reduce the risk that children under five years old in that household are stunted or anemic or help to increase perceived food security by the household head? I use data collected in 2011 and 2013 in the Mvomero district of Tanzania in order to answer these questions. Using a combination of data at the household level on land use practices and on the individual level for health measures, I perform logit and linear regression analysis to identify any consistent significant associations between the two groups. My results are varied: some agricultural practices are associated with stunting or anemia, while others are more strongly associated with measures of food security. The number of children in a household is negatively associated with both food security measures, implying that larger households in the region have difficulty keeping up with food demands. My findings point to the fact that there is no silver bullet in the quest to improve childhood nutrition and food security in Mvomero, Tanzania and worldwide.Item Open Access Agriculture in a Changing Landscape: Modeling shifts in the geospatial distribution of crops in response to climate change(2014-04-17) Morse, NoraAltered patterns of temperature and precipitation associated with global climate change are expected to affect the productivity of agricultural regions around the world, with varying regional impacts. Since ideal environmental conditions vary depending on the physiological needs of specific plant types, the regions where we grow different crop varieties are likely to shift in response. This shift will have profound implications for rural landscapes and communities, as well as global food supply and international markets. In this research I use Classification and Regression Tree (CART) modeling to investigate whether changes in climate over the past 50 years have contributed to shifts in the distribution of crops in Minnesota. I incorporate climate, soil, and agricultural management data to create a time series of regression tree models which predict the acreage of three different important commodity crops, corn, soy, and wheat, for each county. The resulting models indicate that farmers’ decisions to grow corn are positively associated with warmer winter temperatures, and that the temperature threshold has increased over time. Soil quality is the primary predictor of soybean acreage, with a stable threshold over time. Wheat models produced inconsistent results, possibly due to displacement by conversion of wheat acreage to corn acreage. This suggests that farmers are already employing crop-switching strategies in response to recent changes in climate. As the impacts of climate change increase in severity, additional research and investment will be needed to help agricultural producers continue to adapt.Item Open Access Agroecology and Women-Run Farms: A case study of women farmers in the United States(2021-04-30) Gomori-Ruben, LiannaWomen’s farm labor has always been an integral part of agriculture in the United States. How that labor has been understood and documented has changed over time. Today, women are on record as the primary decision-makers of more farms than ever before. This shift in leadership may have implications for natural resource management, agriculture, and food systems. Experts at the Food and Agriculture Organization of the United Nations recognize the vulnerabilities of globalized food systems in the face of climate change and call for nations to transition to agroecology. The FAO has identified women as important leaders of agroecology projects worldwide due to their roles in families and communities. This research is an exploratory mixed-methods case study that collected and analyzed data from a total of 88 participants in the United States using a web-based survey and semi-structured interviews. The findings show that the women farmers who participated in the study realize benefits around food security, nutrition, healthy ecosystems, and social cohesion for their local communities, and their practices and approaches align with the FAO’s ten elements of agroecology.Item Open Access American Manna: Religious Responses to the American Industrial Food System(2016) Krone, Adrienne Michelle“American Manna: Religious Responses to the American Industrial Food System” is an investigation of the religious complexity present in religious food reform movements. I conducted ethnographic fieldwork at four field sites. These field sites are a Jewish organic vegetable farm where the farmers begin their days with meditation, a Christian raw vegan diet center run by Messianic Jews, a Christian family that raises their cattle on pastures and sends them to a halal processing plant for slaughter, and a Jewish farm where Christian and Buddhist farm staff helped to implement shmita, the biblical agricultural sabbatical year.
The religious people of America do not exist in neatly bound silos, so in my research I move with the religious people to the spaces that are less clearly defined as “Christian” or “Jewish.” I study religious food reformers within the framework of what I have termed “free-range religion” because they organize in groups outside the traditional religious organizational structures. My argument regarding free-range religion has three parts. I show that (1) perceived injustices within the American industrial food system have motivated some religious people to take action; (2) that when they do, they direct their efforts against the American food industry, and tend to do so outside traditional religious institutions; and finally, (3) in creating alternatives to the American food industry, religious people engage in inter-religious and extra-religious activism.
Chapter 1 serves as the introduction, literature review, and methodology overview. Chapter 2 focuses on the food-centered Judaism at the Adamah Environmental Fellowship at the Isabella Freedman Jewish Retreat Center in Falls Village, CT. In Chapter 3, I discuss the Hallelujah Diet as prescriptive literature and as it is put into practice at the Hallelujah Diet Retreat Center in Lake Lure, NC. Chapter 4 follows cows as they move from the grassy hills of Baldwin Family Farms in Yanceyville, NC to the meat counter at Whole Foods Markets. In Chapter 5, I consider the shmita year, the biblical agricultural sabbatical practice that was reimagined and implemented at Pearlstone Center in Baltimore, MD during 2014-2015. Chapter 6 will conclude this dissertation with a discussion of where religious food reform has been, where it is now, and a glimpse of what the future holds.
Item Open Access Analysis of the Feasibility and Efficacy of Sustainable Pollinator Bee Certifications for Almond Producers in California(2020-04-22) McNamara, EmilyCalifornia’s almond pollination period is the largest pollination event in the world due to the vast almond acreage spanning the state and the crop’s dependence on pollination by managed honey bees. Since 1996, almond acreage in the state has increased fourfold from 428,000 to 1,700,000 acres. California supplies 80% of the world’s almonds, and 70% of US honey bee hives are transported to the state each year to meet the pollination demand. However, managed honey bee populations continue to decline nationwide, which threatens the almond industry. Experts attribute this decline to pesticide toxicity, lack of diverse and abundant nutrient and pollen sources, and stress from transportation. Several scientifically supported farm management practices show efficacy in protecting and supporting managed honey bee populations in almond orchards. Current analyses show that a majority of almond producers have not adopted these bee-friendly practices. By analyzing the feasibility and attractiveness of certification systems to almond producers in California, this project examines the opportunity to use a certification to incentivize growers to adopt recommended practices to support managed honey bee health. Results indicate that almond producers desire a bee-friendly certification yet confirm that bee-friendly practices are not widely adopted. Further, there is evidence that adoption rates and barriers for implementing bee-friendly practices differ by region, suggesting the need for a new certification that is both effective in supporting pollinator health and feasible for growers to implement.Item Open Access Assessing the Diurnal Cycle of Surface Energy and Water Fluxes in an Irrigated Agricultural field using an Hydrological Model(2007-05) Manandhar, RojinaThe diurnal variation of water and energy fluxes at the land surface is important to understand the diurnal cycle of photosynthesis, moisture and temperature at surface and deeper soil layers, especially during the growing season. The objective of the paper is to characterize the diurnal cycle of surface water and energy fluxes during the growing season of a corn in an irrigated agricultural field. The paper aims to study the response of the landsurface to observed atmospheric forcing at Citra, Florida, using a 1D column implementation of an existing land surface hydrology model. The observational data are analyzed first, including a careful analysis of physical consistency and measurement error. Particular emphasis is placed on the steps taken to evaluate and improve the quality of the two key physical forcing for the model: observed precipitation and radiation forcing. Simulations of energy fluxes, soil moisture and soil temperature from the model are compared against observations at fifteen minute time scales. The model is able to reproduce diurnal variability of the soil moisture and temperature in response to applied forcing. Root mean square error for soil moisture is calculated to be 0.033 m^3/m^3, 0.04 m^3/m^3, and 0.005 m^3/m^3 for superficial, middle and deeper layers respectively. A sensitivity study is conducted to investigate model behavior by changing thermal diffusivity and hydraulic diffusivity (not specified in the observation data), while keeping all other boundary conditions and physical forcing constant in the model. As opposed to previous applications with the model (at larger field scales and not for agricultural fields), it was found that thermal diffusivity and hydraulic diffusivity have a strong impact on the partitioning of the surface energy fluxes, especially in the case of thermal diffusivity with regard to diurnal variation of deep soil temperature.Item Open Access ASSESSING THE IMPACTS OF USDA CIVIL RIGHTS SETTLEMENTS: PIGFORD IN ADVOCACY AND CONTEXT(2019-04-26) Lietz Bilecky, EmmaIn 1999, a class of African American farmers and landowners led by North Carolinian Timothy Pigford sued the United States Department of Agriculture under the Equal Credit Opportunity Act, alleging discrimination in loan-making within USDA county offices during a period in which USDA’s Office of Civil Rights failed to process discrimination complaints. Such patterns of discrimination were connected to significant losses of black-owned farmland throughout the 20th century. While Pigford has been cited as the largest and most successful civil rights case in recent decades, many experienced the settlements as a disappointment. In 2010, a second historic agreement known as Pigford II provided another avenue for farmers excluded from the initial class to bring complaints. Alongside Pigford II, USDA Secretary Tom Vilsack ushered in “a new era of civil rights,” refining loan and benefit programs intended to serve minority and disadvantaged farmers and reforming USDA leadership at many levels. However, almost a decade after Pigford II, African American farmers continue to lose land and experience discrimination in agriculture. Drawing from policy and historical research and nine semi-structured interviews with key stakeholders including advocates, farmers, community organizers, legal experts and academics, this project investigates the effectiveness and lasting impacts of the Pigford settlements. I find that remedies to correct USDA’s discriminatory history failed to extricate structural racism within the department, which continues to uphold policies and practices favoring large, predominately white farmers. Such policies have shaped American landscapes and reproduce inequality in agriculture. Analyzing major themes from original interviews, I find analysis of the Pigford settlements and civil rights reform within USDA is mixed. I discuss failures internal to the settlement process and forms of structural discrimination which continue to disadvantage farmers of color. Though USDA’s attempted reforms and reparations have led to positive changes, I argue that United States agricultural policy retains biases which frustrate institutional reform. USDA must reconsider its own history, biases and mission in light of the experience of African American and minority farmers in order to approach equity, justice and cultural transformation.Item Open Access Assessment of Smallholder Training Programs in Food Sector Climate Strategies(2022-04-21) Grigg, MarjorieThe future outcomes of climate change, the food sector, and supplier land management are codependent. The food sector is responsible for 37% of global greenhouse gas emissions—predominantly due to land use practices—while also facing decreased productivity as climate change worsens. As food companies and suppliers seek to increase yields, they run the risk of exacerbating this dynamic by intensifying and expanding production. Smallholder farmers (SHF) will play a key role in determining the trajectory of the sector’s land use, as they are particularly vulnerable to climate change and the need to boost food production for household income and consumption. Reducing emissions and mitigating climate risk in the food sector is therefore contingent upon strategic engagements that incentivize and support farmers—particularly SHFs—to transition to land use practices that boost productivity and reduce emissions across supply chains. Encouragingly, food companies are increasingly setting targets to reduce their emissions and establishing climate strategies to address supply risk. Many companies also have long-standing training programs to support SHFs, typically through philanthropic and Corporate Social Responsibility initiatives. However, even where companies are both taking climate action and engaging with small farmers, it is unclear how or if these initiatives are integrated within corporate climate strategy. Alignment across these efforts could accelerate progress by leveraging ongoing programming, and maximize investments and results by identifying synergies across these interconnected objectives. Failing to integrate these initiatives could lead to ineffective investment of limited funding; duplication or counteraction of efforts; and ultimately failure to optimize outcomes across these vital interventions for the sector. In sustainable business strategy, “embedded” initiatives (in which sustainability concerns are integrated into a company’s core strategy) are recognized as more effective than “bolt on” strategies, which tout “green initiatives and social philanthropy,” but are separate from the company’s core strategy. Beyond business strategy, it will be important for companies already investing in initiatives with smallholders to understand how these programs are “embedded into” or “bolted onto” their broader climate action if they are to optimize their efforts to bolster supply, reduce emissions, and support livelihoods. Given the importance of small farmers in creating a sustainable and viable trajectory for global food production and climate action, this study assesses the degree to which companies’ smallholder training programs are embedded within their corporate aims to reduce emissions and mitigate supply risk. Any learnings or areas for improvement will not only inform Corporate Sustainability Officers looking to scale their impact, but will also provide an important road map for companies newly investing in these types of interventions within their supply chains. To improve the level of comparability within this sample, I limited the study area to food companies with 1) emissions targets verified by the Science-based Targets Initiative; 2) climate strategies reported to the same environmental disclosure platform, the Carbon Disclosure Project (CDP); and 3) SHF training programs in Latin America with the same implementing NGO, TechnoServe. I begin by examining companies’ publicly facing sustainability communications, such as Corporate Impact Reports. I examine these publications using the four capitals of environmental economics (natural capital, produced capital, and human and social capitals) to assess companies’ expressed priorities and concerns when communicating to stakeholders about sustainability efforts within their supply chains. I then draw on the principles of materiality and sustainable business strategy to track how supply chain concerns flow throughout companies’ climate strategies, as reported through their CDP “Climate Change Surveys.” I examine how those supply chain concerns translate (or fail to translate) into concrete targets, and then compare these targets with the metrics for success defined in their training programs. I use this alignment as a metric to evaluate the embeddedness of those programs into broader corporate climate action, and posit initial considerations to better integrate smallholders into more effective corporate climate strategies. Findings within this sample indicate that companies emphasizing broad social outcomes for their farmers—rather than explicit land use outcomes within their value chains—are motivated by “social philanthropy” rather than “embedded sustainability,” and, because of this, fail to leverage their investments to drive progress against corporate climate action. While the limited scope of this study does not allow for generalizable conclusions, it highlights initial trends and considerations that can be used by Corporate Sustainability Officers and implementers such as TechnoServe with the power to better align these climate initiatives and optimize their impact. Companies with “embedded” training programs distinguished themselves by training their direct suppliers, aligning training outcomes with internal supply standards, including specific land use concerns within these standards and public sustainability communications, and addressing challenges farmers may face in complying with those standards (for example facilitating access to credit). All “embedded” programs acted within a value chain that accounts for at least 30% of the companies’ revenues. Based on these findings, it will be important for Corporate Sustainability Officers managing “bolt on” farmer engagement programs to identify an achievable, initial set of sourcing standards that can bridge the gap between their farmer training activities and their supply-chain and climate interventions. Third-party certifications and implementing partners could facilitate this transition by providing verification standards and adapting ongoing training curricula to meet these standards, respectively. Because many of these programs are already promoting best practices similar to embedded programs’ sustainable sourcing criteria, a key challenge for corporate sustainability teams will be to measure uptake of those practices in relation to emissions outcomes, and to concentrate training within their companies’ sourcing channels. It will therefore be essential for these teams to understand and mitigate the barriers their sourcing counterparts may face in making direct investments with local suppliers. Conversely, companies with “embedded” training programs could leverage their land use outcomes to establish more rigorous emissions targets. For implementers working with both types of companies, it will be vital to understand their role in making the above transitions feasible and desirable for food companies in order to optimize results for the climate, food production, and the producers who depend on both.Item Open Access Causes and Impacts of Institutional and Structural Variation: Globalization in the Tobacco and Pork Industries(2010) Denniston, RyanAmong the most significant changes to the agricultural sector in the twentieth century include a sharp decline in employment and the numbers of farms, a decline in the proportion of total value that accrues to agricultural producers, and an increase in farm level and regional specialization. Within the U.S., substantial differences in the characteristics of agricultural producers and the spatial distribution of production persist amid industry change. These changes coincided with changes in global markets, domestic consumption, consolidation and concentration within the processing and retailing sectors, and government policy. The causality that lies behind these developments is the key puzzle that this study addresses.
This study advances an institutional explanation of industry formation across locations within the U.S. Differences in industry constitution at the local level produce different impacts of and responses to global markets, reflected by economic changes and policy developments, as actors work to secure stability and advantage in markets (Fligstein 2001). This study uses the global value chains' definition of the industry, which incorporates the network of actors arrayed along a process of production, to capture the set of actors with the capacity to affect industry operation (Gereffi 1994). An assessment of the relative importance of local economic characteristics, global markets, organization and coordination within industries, and government policies to where production locates in the primary objective of the study.
The pork and non-cigar tobacco industries across several states within the United States from 1959 through 2005 allow for a contrast along the key changes identified above. Within case comparison is used to construct causal narratives of industry change at the state level. Panel and pooled time series analysis assess the relative importance the factors to agricultural change.
Local economic characteristics largely fade from significance with the inclusion of the theoretical perspectives. Total and net trade in agricultural and manufactured products is generally significant across industries for production, although this is not the case for specific tobacco types. The proportion of farms composed of small farms is significant for production and for farm structure in both industries. The presence of manufacture is significant for hog production and could not be assessed for tobacco. While federal policies are broadly significant for the tobacco industry, identified state policies exhibit few consistent effects for hog production. Importantly, farm structure measures were only available for Census years, which reduces sample size. Second, many of the measures are industry-specific, which reduces comparability.
Item Open Access Clean Water Through Conservation in the Jordan Lake Watershed(2019-04-25) Tucker, Emily; Ray, James; Parks, RyanWatershed management is becoming increasingly holistic. Novel approaches are needed to satisfy the interests of diverse stakeholders – including municipal water users, environmental groups, and agricultural communities. In the rapidly developing Jordan Lake Watershed, stakeholders are eagerly seeking comprehensive approaches to prevent further water quality degradation and the loss and fragmentation of ecological resources. We present an approach for identifying these opportunities. First, we identify high quality natural areas that should be protected to maintain water quality. Second, we highlight riparian restoration areas that maximize pollutant retention and bridge the watershed’s biodiversity hotspots. Finally, we evaluate the financial costs and benefits farmers face when adopting conservation agricultural practices to determine where they will be most successful. In combination, these practices can protect, connect and restore a high-functioning watershed.Item Open Access Crop Insurance and Climate Change: Balancing structure and flexibility to improve on-farm management of climate risk(2014-04-18) Morse, NoraEXECUTIVE SUMMARY: INTRODUCTION Crop insurance has become an important tool for managing economic and environmental risk in the agricultural sector, and one of the largest sources of Federal subsidies to agricultural producers. This research examines the near- and long-term risks to agricultural producers, and seeks to identify and evaluate potential policy opportunities within the federal crop insurance program to improve the climate adaptation capacity of insured farms. The crop insurance program contains several structural barriers to sustainable, adaptive management practices, including a lack of soil and water conservation requirements common to other farm support programs (remedied in the Agricultural Act of 2014), and stringent planting date requirements which discourage farmers from using cover crops to protect their soil from erosion and enhance fertility, as well as diversify their farms (both economically and biologically) and increase climate resiliency. POLICY RECOMMENDATIONS 1. Reinstate conservation compliance requirements for eligibility to receive federal subsidies towards crop insurance coverage (successfully passed in the Agricultural Act of 2014). 2. Provide farmers who plant cover crops with an additional “buffer” period after their policy’s final planting date to allow appropriate termination of the cover crop without jeopardizing the insurance coverage on their primary crop. ANALYSIS & METHODS To evaluate the economic impacts of requiring conservation compliance for eligibility to receive crop insurance subsidies, I constructed a cost benefit analysis at the national scale, including cash flows for the economy as a whole, the government, and affected farmers. My analysis focuses on the marginal impact of the program, quantifying only the marginal costs and benefits of implementing the program on farms which are not currently participating in any other Farm Bill programs requiring conservation compliance, and which will be coming under the compliance requirement for the first time due to their use of subsidized crop insurance. This eliminates all farms which would be subject to the requirement whether or not it was added to the crop insurance program, and thus more accurately quantifies the impact of the policy change within the context of other interrelated farm support programs. Due to the lack of data from the field regarding the dynamics of planting date restrictions and cover cropping decisions, I could not construct a national-scale cost benefit analysis to evaluate my second policy recommendation. I instead created a farm-scale cost benefit model to compare the performance of a commodity mono-crop with a dual, cover crop and commodity crop system. The model takes into account the unique economic, social, and biological attributes of the farm using yield, acreage, crop selection, planting dates, management practices, and insurance parameters to produce estimates of the costs and benefits at the farm level. RESULTS The results of my analysis show that conservation compliance, even under the most conservative scenario, provides a net benefit to farmers and to the economy as a whole for a comparatively modest initial investment on the part of farmers and the government. In my moderately conservative cost benefit analysis scenario, reinstating the conservation compliance requirements in association with crop insurance provides an incremental net benefit of at least $4,411 per acre in present value terms, with over $780 per acre of those benefits accruing to the farmer. The cover crop analysis did not provide any generalizable results, however it does suggest that a buffer period within the planting date restrictions for farmers growing cover crops may help mitigate the risk of cover crops interfering with the profitability of farmers’ primary commodity crop, and thus remove one of the barriers to adoption. I recommend a pilot test of this policy change, with rigorous measurement and evaluation of the impacts on farm revenue, insurance and subsidy payments, and environmental outcomes. CONCLUSIONS With impending near- and long-term threats of climate change, the crop insurance program should balance the need for rigid management requirements to ensure an appropriate baseline level of risk mitigation and management with the flexibility to allow farmers to experiment with new management practices to find what works best in their new climate context. The benefits of the conservation compliance requirement vastly outweigh the costs, and provide a cost-effective mechanism for improving adaptive capacity on already vulnerable agricultural lands. While the planting date buffer period is a promising mechanism for increasing the use of cover crops and improving farmers’ capacity to develop new adaptive risk management strategies at the local level, additional research and field testing is needed to determine the impact of relaxing the constraint on actual adoption rates in the field.Item Open Access Culture, Capture, and Disease: Shrimp Production in the Age of Industrial Aquaculture(2019) Dubik, Bradford AThis dissertation focuses on the relationship of industrial shrimp aquaculture and shrimp diseases, with an emphasis on the agency of disease in shaping the history of shrimp production. Shrimp aquaculture is concentrated in developing tropical economies, with the significant majority of shrimp exported to consumers in the Global North. The rise of shrimp aquaculture has been accompanied by the development of new technologies and practices, designed to facilitate and govern the growth of the industry. While successful in making aquaculture the single largest production method for shrimp, these innovations also created ideal environments for the emergence and spread of shrimp diseases, which have caused significant and persistent production losses. Disease has brought volatility and risk to producer livelihoods, while also necessitating further technological modernization and development interventions to curb disease outbreaks.
This research draws on qualitative interviews and contextual economic analyses to explore the role of disease at multiple scales. Chapter 2 examines how disease has shaped industry discourses and he practice of shrimp aquaculture across contexts. The role of the concept of biosecurity is examined to highlight the territorial nature of disease prevention. Chapter 3 explores the context of shrimp aquaculture development in Aceh, Indonesia. This chapter applies the general ideas explored in Chapter 2, to a real-world case, highlighting how the pairing of shrimp and disease is managed as a single commodity. Chapter 4 explores the reach of disease globally, and across methods of production. The economic effects of disease on U.S. wild shrimping are explored, along with the role of disease as a narrative element in resisting global aquaculture.
It is argued that shrimp disease shapes commodity relationships, influencing production decisions, and development priorities at multiple scales. The unsympathetic quality of disease makes disease prevention an ideal project for enrolling broad coalitions of human and non-human actors, and negating the politics embedded in the relationship of disease prevention with commodification more broadly.
Item Open Access Designing and Implementing Workshops: A Program Evaluation of an Agricultural and Chicken Husbandry Development Program in Madagascar(2024-04-26) Nasir, DaniaMadagascar struggles with intensifying human pressure on natural resources threatening lemur habitat. This program evaluation looks at the short- and medium-term impacts of the Duke Lemur Center’s gardening and chicken husbandry workshops in the village of Ambodivoara. It answers the following questions: To what extent did the workshops achieve the desired outcomes? What worked well and how can they be improved? And what was the experience of participants in these workshops? Qualitative data was collected on-site through 16 interviews and 2 focus groups with workshop participants during the summer of 2023. Overall respondents reported a largely positive experience with varied outcome achievement. At the end of the project, recommendations were given to the DLC on methods to overcome barriers to their objectives and improve the effectiveness of their efforts. Recommendations range from increasing continued engagement and interactive sessions to topic-specific adjustments.Item Open Access Earthworms modify plant biomass and nitrogen capture under conditions of soil nutrient heterogeneity and elevated atmospheric CO2 concentrations(Soil Biology and Biochemistry, 2014-01-01) García-Palacios, Pablo; Maestre, Fernando T; Bradford, Mark A; Reynolds, James FEarthworms modify the way roots respond to soil nutrient patchiness. However, few studies have evaluated the joint effects of earthworms and soil heterogeneity on plant community biomass and species dominance, and none of them have assessed the influence of different patch features and environmental conditions on such effects. We evaluated how soil nutrient heterogeneity, earthworms (Eisenia fetida), organic material quality (15N-labelled leaves and roots of contrasting C: N ratios) and elevated atmospheric CO2 concentrations (phytotron chambers) affected the resource-use strategy, biomass and species dominance of mixtures formed by Lolium perenne L. and Plantago lanceolata L. Soil heterogeneity decreased N capture from the organic material, especially in the presence of earthworms. Mixtures experienced a 26 and 36% decrease in shoot and root biomass when earthworms were added to the heterogeneous microcosms, but only with high quality organic material. The dominance of L. perenne was lower under conditions of elevated CO2, nutrient heterogeneity and earthworms. Our data suggest that earthworms can neutralize positive plant growth responses to soil heterogeneity by exacerbating decreases in the supply of N to the plant. Specifically, earthworms foraging for high quality patches may stimulate microbial N immobilization, translating into lower N capture by plants. Increases in casting activity under elevated CO2, and hence in microbial N immobilization, may also explain why earthworms modulated the effects of soil heterogeneity and CO2 concentrations on plant community structure. We show that earthworms, absent from most soil nutrient heterogeneity studies, mediate plant biomass responses to nutrient patchiness by affecting N capture. Future plant-foraging behaviour studies should consider the roles played by soil engineers such as earthworms, so that results can be better extrapolated to natural communities. © 2014 Elsevier Ltd.Item Open Access Estimates and determinants of stocks of deep soil carbon in Gabon, Central Africa(Geoderma, 2019-05-01) Wade, AM; Richter, DD; Medjibe, VP; Bacon, AR; Heine, PR; White, LJT; Poulsen, JR© 2019 Despite the importance of tropical forest carbon to the global carbon cycle, research on carbon stocks is incomplete in major areas of the tropical world. Nowhere in the tropics is this more the case than in Africa, and especially Central Africa, where carbon stocks are known to be high but a scarcity of data limits understanding of carbon stocks and drivers. In this study, we present the first nation-wide measurements and determinants of soil carbon in Gabon, a nation in Central Africa. We estimated soil carbon to a 2-m depth using a systematic, random design of 59 plots located across Gabon. Soil carbon to a 2-m depth averaged 163 Mg ha −1 with a CV of 61%. These soil carbon stocks accounted for approximately half of the total carbon accumulated in aboveground biomass and soil pools. Nearly a third of soil carbon was stored in the second meter of soil, averaging 58 Mg ha −1 with a CV of 94%. Lithology, soil type, and terrain attributes were found to be significant predictors of cumulative SOC stocks to a 2-m depth. Current protocols of the IPCC are to sample soil carbon from the surface 30 cm, which in this study would underestimate soil carbon by 60% and underestimate ecosystem carbon by 30%. A nonlinear model using a power function predicted cumulative soil carbon stocks in the second meter with an average error of prediction of 3.2 Mg ha −1 (CV = 915%) of measured values. The magnitude and turnover of deep soil carbon in tropical forests needs to be estimated as more countries prioritize carbon accounting and monitoring in response to accelerating land-use change.
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