14 Pages, iZindaba Zokudla (IZ) is a multistakeholder engagement project that aims to create opportunities for urban agriculture in a sustainable food system in Johannesburg. IZ implements the Farmers’ Lab, a social lab used as a transitional mechanism in a larger transition to sustainability. To move the South African urban food system to an ecologically sound, economically productive, and socially equitable system, significant stakeholder integration is needed, and the iZindaba Zokudla Farmers’ Lab provides that. This reflective essay presents a history of the project (2013 until now) detailing the project’s creation of an ecosystem based on social labs that facilitate innovation in the food system. Emergent entrepreneurs and others use the social labs and their activities, as well as stakeholder engagement in their enterprise development, and these Labs have created opportunities for applied and other research in the university. This has brought innovation and change to agroecological practice in Johannesburg. This reflective essay article situates IZ within the broader evolutionary change in South Africa and considers how conversations about food lead to the creation of sustainable food systems.
17pgs, There is a lack of data on resources used and food produced at urban farms. This hampers attempts to quantify the environmental impacts of urban agriculture or craft policies for sustainable food production in cities. To address this gap, we used a citizen science approach to collect data from 72 urban agriculture sites, representing three types of spaces (urban farms, collective gardens, individual gardens), in five countries (France, Germany, Poland, United Kingdom, and United States). We answered three key questions about urban agriculture with this unprecedented dataset: (1) What are its land, water, nutrient, and energy demands? (2) How productive is it relative to conventional agriculture and across types of farms? and (3) What are its contributions to local biodiversity? We found that participant farms used dozens of inputs, most of which were organic (e.g., manure for fertilizers). Farms required on average 71.6 L of irrigation water, 5.5 L of compost, and 0.53 m2 of land per kilogram of harvested food. Irrigation was lower in individual gardens and higher in sites using drip irrigation. While extremely variable, yields at well-managed urban farms can exceed those of conventional counterparts. Although farm type did not predict yield, our cluster analysis demonstrated that individually managed leisure gardens had lower yields than other farms and gardens. Farms in our sample contributed significantly to local biodiversity, with an average of 20 different crops per farm not including ornamental plants. Aside from clarifying important trends in resource use at urban farms using a robust and open dataset, this study also raises numerous questions about how crop selection and growing practices influence the environmental impacts of growing food in cities. We conclude with a research agenda to tackle these and other pressing questions on resource use at urban farms.
