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Student capstone and applied projects from ASU's School of Sustainability.

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Adding a Soil Fertility Dimension to Locust and Grasshopper Management, a Case Study in West Africa

Description
In Senegal, West Africa, soils are a vital resource for livelihoods and food security in smallholder farming communities. Low nitrogen (N) soils pose obvious challenges for crop production but may also, counterintuitively, promote the abundance of agricultural pests like the Senegalese locust, Oedaleus senegalensis. In this study I investigated how…

In Senegal, West Africa, soils are a vital resource for livelihoods and food security in smallholder farming communities. Low nitrogen (N) soils pose obvious challenges for crop production but may also, counterintuitively, promote the abundance of agricultural pests like the Senegalese locust, Oedaleus senegalensis. In this study I investigated how the abundance of locusts and grasshoppers are impacted by soil fertility through plant nutrients and how these variables change across land use types. We worked in two rural farming villages in the Kaffrine region of Senegal. Overall, there was little variation in soil properties and an agricultural landscape low in soil organic matter (SOM) and inorganic soil nitrogen. I corroborated that SOM is a significant driver of soil inorganic N, which had a positive relationship to plant N content. Of the management practices we surveyed, fallowing fields was important for soil nutrient restoration and years spent fallow was significantly correlated to inorganic soil N and SOM. O. senegalensis was least abundant in groundnut areas where plant N was highest. Additionally, I found a significant negative correlation between O. senegalensis abundance and plant N, suggesting that plant nutrients are an important driver of their populations. Grasshoppers, excluding O. senegalensis, were more numerous in grazing areas and fallow areas, perhaps due to a higher diversity of ecological niches and host plants. These results connect land use, soil, and vegetation to herbivores and suggest that improving soil fertility could be used as an alternative to pesticides to keep locusts at bay and improve crop yields.
ContributorsWord, Mira (Author) / Hall, Sharon (Contributor) / Robinson, Brian (Contributor) / Manneh, Balanding (Contributor) / Beye, Alioune (Contributor) / Cease, Arianne (Contributor)
Created2018-04-10

An Intervention Manual for Implementing Water Savings Design Strategies for Community Food Hubs: A Case Study of the IRC Aquaponics Incubator

Description

The International Rescue Committee (IRC) is a non-profit organization that prides itself in “responding to the world’s worst humanitarian crises”. Through its New Roots program, IRC is using an aquaponics urban garden incubator site “to train refugee farmers in aquaponics agriculture and good business practices in the United States.” The…

The International Rescue Committee (IRC) is a non-profit organization that prides itself in “responding to the world’s worst humanitarian crises”. Through its New Roots program, IRC is using an aquaponics urban garden incubator site “to train refugee farmers in aquaponics agriculture and good business practices in the United States.” The site is an example of the conversion of brownfield into “healthfields” and sustainability and resilience initiatives including the Year of Healthy Communities Program-2017, the Maricopa County Food Systems Coalition, and other community health initiatives that involve major partners including the City of Phoenix.

Entering into the next development phase, IRC wants the site to be an opportunity for demonstrating some of the most innovative approaches to water reuse while contributing to a sustainable food network in the neighborhood and in the Phoenix Metropolitan Area. One component created to support this goal is an intervention manual identifying water-sensitive design strategies and ways to scale or transfer to other IRC sites. As such, my project identified and framed guidelines for the selected strategies to use in addition to steps for scaling, transferring, and creating a “location” where all of this information could be held for future reference. The manual content was created around each strategy which included identifying general legal practices in Phoenix related to each strategy, defining key terminologies, detailing water budgets, and research gaps to overcome.
ContributorsJordan, Amanda (Toohey) (Author) / Dunton, Tristan (Contributor)
Created2017-04-28