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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
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The Kosovo Sustainable Settlement Redevelopment Program

Description
South Africa, like many countries of the Global South, has witnessed explosive growth in urban population in recent decades. In a post-apartheid time, the majority of urban growth has accumulated in densely populated informal settlements. These areas delivered poorly planed and constructed single unit housing lacking adequate and necessary services,…

South Africa, like many countries of the Global South, has witnessed explosive growth in urban population in recent decades. In a post-apartheid time, the majority of urban growth has accumulated in densely populated informal settlements. These areas delivered poorly planed and constructed single unit housing lacking adequate and necessary services, leading to increased economic and social exclusion in urban sprawl, with a need for full scale settlement redevelopment. The Kosovo Informal Settlement is one of the oldest and densest in Cape Town, South Africa, with a population of more that 26,000 in an area of 28 hectares. Kosovo is facing many challenges with poverty, hunger, poor health and sanitation, violence, environmental degradation, and fire and flood risks amplifying the necessity to hold priority in the redevelopment process. How can you provide urban upgrading and redevelopment and meet the needs of the community sustainably? The design of the Kosovo informal settlement redevelopment used multiple planning principles, which include space and movement systems, appropriate building sizing, sustainable infrastructure design and planning, building efficiency, and effective land use. Health, safety and security, community education and opportunities, and sustainable resource use must also be considered. Settlement land use can be developed for mixed-use opportunities such as community gardening, education, and training advancements to optimize access for employment options. The Kosovo Informal Settlement is a community with multiple opportunities for advancement in sustainable planning if the proper leadership, community participation and redevelopment stages are introduced and carried out effectively.
ContributorsAnsara, Nicolas (Author) / Mpahlwa, Luyanda (Contributor) / Cook, Edward (Contributor)
Created2017-03-16