Natalie Hoidal’s research while affiliated with St. Catherine University and other places

Soil health is at the root of agricultural sustainability, and small-scale vegetable farmers are becoming an increasingly important part of the US food system. These farmers face unique challenges when it comes to managing soil on their farms. These challenges include reliance on intensive production practices, the use of primarily organic inputs with difficult to calculate nutrient concentrations, and lack of access to formal education tailored to their needs. We surveyed farmers at 100 small-scale vegetable farms in Minnesota to (1) develop a better baseline understanding of how small-scale vegetable farmers utilize key soil health practices including nutrient management, cover crops, and tillage; (2) explore how farm demographics influence the adoption of soil health practices; and (3) determine educational priorities to better support these growers. Here, we report a lack of understanding about the nutrient contributions of compost, which is often applied at very large volumes without guidance from soil test results, with implications for nutrient loading in the environment. Farmers in our study had high rates of cover crop adoption relative to other farmers in the region despite several barriers to using cover crops. More experienced farmers were more likely to utilize more tillage, with more use of deep tillage implements on larger farms. Overall, organic certification was correlated with higher adoption of soil health practices including utilization of soil tests and cover crop use, but it was not correlated with tillage. Other demographic variables including land access arrangement and race did not meaningfully influence soil health practices. Our findings suggest a need for more research, outreach, and education targeted to vegetable farmers about how to interpret laboratory soil test results, and how to responsibly utilize organic inputs including vegetative compost and composted manure at rates appropriate for crop production in a diversified farm setting. We also report a need to compensate farmers for their labor to incentive cover crop use on small farms, and a need for more research and support for farmers in the 3–50-acre range to utilize reduced tillage methods.

Emerging farmers, including immigrant farmers, play an increasingly important role in the food system of the Upper Midwestern United States but face significant barriers to success. One important barrier is the lack of culturally relevant and system-specific training and technical assistance, particularly related to soil health and nutrient management. A team of researchers and farm support professionals was convened to conduct a farmer engagement process consisting of a survey and focus groups to better understand the experiences and wisdom that emerging farmers already have, and their educational needs related to soils. The broader goal was to inform the development of culturally relevant tools and training. Here we identify key takeaways related to content needs and learning style preferences. While emerging farmers are already skilled in assessing physical and biological aspects of soil health, they often need support in understanding chemical properties of soil, how to do soil testing, and how to translate soil test results into actionable practices. Additionally, many emerging farmers have experience in other countries and in agricultural systems based on practices such as shifting cultivation. Supporting farmers as they adapt these practices to a Midwest context requires educators to learn about these systems and value the expertise of farmers from diverse farming backgrounds. There is a particular need for more nuanced and farm scale-specific training about inputs in highly diversified, mostly organic systems, especially related to compost and manure management. In terms of learning styles, farmers preferred hands-on training opportunities with as much mentorship and peer learning as possible. Many Midwestern emerging farmers participate in incubator farm programs for beginning growers. While such programs provide valuable access to land and infrastructure, they often lack the capacity to provide tailored participant mentorship. This leaves program graduates unsure about how to utilize soil health and nutrient management practices when they start their own farms. To improve soil health and nutrient management outcomes for emerging farmers, we propose investing in train-the-trainer type programs for farmer leaders and staff with beginning farmer organizations. These programs should include tailored one-to-one mentorship and peer learning with an emphasis on organic inputs, chemical aspects of soil health, and diversified production systems.

Collaboration between farmers and other farm support professionals is a critical tool for food systems transformation. Collaborative research and outreach can address structural inequalities that limit the success of immigrant and minority growers and uplift farmer knowledge, which has been systemically valued below that of academic knowledge. Agroecologists who work at the synthesis of science, movement, and practice propose wisdom dialogues and horizontalism as principles by which to develop collaborations that avoid reinforcing structural inequalities due to race, gender, and traditions of valuing academic knowledge above that of farmers. Public entities, such as land grant universities and state agencies, have a particular responsibility to address structural inequalities and serve the diversity of farmers in their region. This study examines the use of collaborative learning processes, such as wisdom dialogues and horizontalism, by public and non-profit professionals in their collaborations with a group of immigrant farmers in the Upper Midwest. We used a qualitative interview approach with two farmers, two of their advisers, and eight of their collaborators at the University of Minnesota Extension, Department of Agriculture, and a local agricultural non-profit. Through the interviews we examined each of their perspectives on current and potential collaborations by discussing the motivations, resources, and effects for and of collaboration between immigrant farmers and farm support professionals. Farmer interviewees emphasized that collaborations between immigrant and non-immigrant individuals and groups must develop with non-exploitative motivations and preparation undertaken by non-immigrant individuals to better understand the experience of immigrant farmer prior to engaging in collaboration. Emergent themes from interviews with non-farmers included a strong commitment to providing access to knowledge and resources, and recognition that collaboration improved the ability to accomplish institutional goals, indicating use of wisdom dialogues and horizontal learning at varying levels within current work. Interviewees emphasized that institutional support was an important determinant for how much they could prioritize relationships and collaboration in their work. Based on interviewees' experiences, support and continued opportunities for learning are critical to facilitate continued use of wisdom dialogues and horizontalism to address different conceptions of equity and equality, and for developing intentional and mutually beneficial collaborations.

The 2015 revision of the Worker Protection Standard (WPS) mandates requirements for medical evaluation, fit testing, and respirator training when the pesticide label requires a respirator. An ad-hoc group of Extension pesticide safety educators came together to address a lack of training and infrastructure for respirator compliance. In the ensuing years, programs of varied audiences and formats were hosted. Errors and shortcomings were realized, knowledge was gained, and lessons were learned. Those lessons are summarized here with links, resources, and suggestions for the implementation of similar efforts by Extension professionals.

Economic thresholds (ETs) are a foundational principle of integrated pest management but are not always widely accepted by farmers and agricultural professionals. This article reports on a survey of Minnesota farmer and agricultural professional perceptions of the ET for soybean aphid, Aphis glycines Matsumura (Hempitera: Aphididae). We discuss insights for Extension programs on how to frame the importance of thresholds and teach stakeholders to use them effectively. Key takeaways include farmers and agricultural professionals often worry about combined effects of insect, disease, and physiological pressures, whereas effects of interactions with these other stressors are seldom discussed in educational outreach. Across groups, there is a fundamental misunderstanding about the difference between ETs and economic injury level. Many survey participants reported believing in the ET but lacked the time and capacity to fully implement it. Sales agronomists and farmers were the least likely groups to trust the university-determined soybean aphid ET, whereas commercial pesticide applicators and independent consultants were the most likely groups to trust it. Based on these results, we recommend adapting communication about ETs based on the target audience to address common misconceptions and barriers to ET use that are unique to each group.

At present high-quality protein-rich food sources are increasing to offer a sustainable alternative for the growing world population demand. Plant protein production favors biodiversity, environmental sustainability, and human health. The production of plant proteins is more cost-effective and resource-efficient compared to meat proteins since they are less exigent in terms of natural resources (nitrogen, water, etc.). The natural nitrogen fixation of legumes enriches soils and benefits cropping systems. Reducing red meat consumption and increasing consumption of protein from other sources could also increase health benefits. In this chapter we analyze the production and use of protein crops for human consumption and review their sustainability under Northern and Southern European environments.

BACKGROUND Amaranth leaves can provide important nutrients to small‐scale farming families growing amaranth for seed. Amaranth is known to be tolerant to defoliation, but there is little guidance on when defoliation should be performed for optimal nutritional benefits. This series of experiments assessed tolerance to defoliation at different points throughout the vegetative stage of development, in addition to the nutritional benefits and flavor of amaranth leaves at each stage. RESULTS Overall, timing of defoliation had no impact on seed yield or quality. Fifty percent defoliation at any point did not significantly reduce seed yield, whereas 100% defoliation throughout development reduced seed yield. The nutritional value of amaranth leaves differed substantially throughout development, with the highest concentrations of iron mid‐way through vegetative development, and the highest levels of vitamin A, magnesium, and copper at the end of the vegetative development stage. Palatability was highest in young leaves, and decreased as plants aged. We also found that neither timing nor intensity of defoliation had an influence on branching, which can negatively influence ease of harvest. CONCLUSIONS These results indicate that amaranth leaves are a nutritious food source that provides vital nutrients at different concentrations throughout development. Farmers who wish to harvest both leaves and seeds can harvest up to 50% of the leaves at any point during vegetative development or bud formation while maintaining seed yield. Leaf harvest timing can thus be tailored to nutritional needs, although palatability decreases with plant age. © 2020 Society of Chemical Industry

Dual-use production systems that utilize the green leaves as well as seeds from amaranth are highly promising for small-scale farmers around the world. The leaves are an important source of nutrients for farming families, while seeds can provide income. Farmers who use amaranth as a dual-use crop are concerned about the impacts of defoliation on seed yield. This experiment tested defoliation at various intensities and frequencies (0, 25, 50, 75, and 100% defoliation, 1, 2, and 3 times) under controlled conditions as well as under Danish and Mexican field conditions. Defoliation tolerance was tested in a total of seven varieties, spanning the three primary grain amaranth species: A. cruentus, A. hypocondriacus, and A. caudatus. In all of the varieties and environments tested, we found that neither seed yield nor quality was impacted by a single defoliation event at intensities up to 50% leaf removal. We observed similar responses with two and three consecutive defoliations in which we removed 25% of all leaves. Greater frequency and intensity of defoliation resulted in reduced seed yield in some environments, while seed quality (protein content and 1000 KW) did not appear to be affected. Dual-use production systems should be promoted with small-scale farmers around the world as promising systems for improving local nutrition while maintaining profits from seed production. This paper provides baseline guidelines for farmers regarding optimal defoliation intensities and frequencies.

Ecological shifts in shallow lakes from clear-water macrophyte-dominated to turbid-water phytoplankton-dominated are generally thought of as rapid short-term transitions. Diatom remains in sediment records from shallow lakes in the Prairie Pothole Region of North America provide new evidence that the long-term ecological stability of these lakes is defined by the legacy of large regime shifts. We examine the modern and historical stability of 11 shallow lakes. Currently, four of the lakes are in a clear-water state, three are consistently turbid-water, and four have been observed to change state from year to year (transitional). Lake sediment records spanning the past 150-200 yr suggest that (1) the diatom assemblage is characteristic of either clear or turbid lakes, (2) prior to significant landscape alteration, all of the lakes existed in a regime of a stable clear-water state, (3) lakes that are currently classified as turbid or transitional have experienced one strong regime shift over the past 150-200 yr and have since remained in a regime where turbid-water predominates, and (4) top-down impacts to the lake food-web from fish introductions appear to be the dominant driver of strong regime shifts and not increased nutrient availability. Based on our findings we demonstrate a method that could be used by lake managers to identify lakes that have an ecological history close to the clear-turbid regime threshold; such lakes might more easily be returned to a clear-water state through biomanipulation. The unfortunate reality is that many of these lakes are now part of a managed landscape and will likely require continued intervention.