Research & reports

Nancy Karanja, Fiona Yeudall, S Mbugua, Mary Njenga, Gordon Prain, Donald C. Cole, Alexandra L. Webb, Daniel Sellen, Christopher Gore, Jennifer Levy · International Journal of Agricultural Sustainability · Kenya (Nakuru)

This paper outlined the conception, design, and implementation of a project aimed at strengthening technical, environmental, financial, and social capacity for urban agriculture (UA) among HIV-affected households in Nakuru, Kenya. Key lessons learned included the value of multi-stakeholder partnerships, the crucial role of self-help group organizations, and the importance of institutional commitments to support farming by vulnerable persons. The usefulness of mixed-methods evaluative tools for monitoring progress was also highlighted.

Hygin Faust Kakai, Alban Gilles Kakai, Armelle Grey Tohouegnon · VertigO · Benin (Cotonou)

This study in Benin examined urban agriculture and waste valorization in Cotonou, Abomey, and Abomey-Calavi. In Cotonou, overexploitation of sandy, organic-poor soil in market gardening led to soil impoverishment, forcing gardeners to use chemical fertilizers with negative environmental impacts. However, some market gardeners adopted compost use, transitioning to organized organic urban agriculture after a waste management project supported waste valorization. This dynamic was not observed in Abomey, where urban agriculture is practiced in family spaces and public areas, unlike Cotonou's developed sites. Abomey-Calavi, despite rapid demographic growth, was almost devoid of urban agriculture practices.

Kamasi Angwenya · Zenodo (CERN European Organization for Nuclear Research) · Africa

This study evaluated the impact of digital payment systems on cash flow and financial growth performance metrics among Tanzanian urban farmers, focusing on commercial farming activities, using a systematic literature review approach that synthesized existing studies on digital payments in Tanzania's urban agricultural settings. The analysis found a significant positive correlation (r = 0.78 ± 0.15) between digital payment adoption and improved financial growth performance metrics, indicating substantial improvements in cash flow management.

Mark Matsa, Thomas Marambanyika · Journal of Environmental Extension · Africa

A study assessing concentration levels of lead (Pb), cadmium (Cd) and sulphides (SO2) within and around Gweru's sole official waste dumpsite in Zimbabwe. Harsh economic conditions in the city have driven further expansion of urban agriculture on open spaces, with residents growing staple food crops such as maize and sweet potatoes for subsistence on numerous plots surrounding the dumpsite; the study states that ingesting crops grown near the dumpsite is likely to put residents' lives at risk. Soil sampling points along transects on and around the dumpsite were randomly selected using ArcView GIS, with sulphide concentrations measured by Leco machine and lead and cadmium by atomic absorption spectrometer. Independent t-test results showed the concentration levels of the three pollutants were significantly elevated from one sampling point to the next, within and around the dumpsite.

J. O. Oladeji · Journal of Agriculture Forestry and the Social Sciences · Nigeria

A survey in three urban local government areas of Ibadan, Nigeria, used questionnaires and descriptive/inferential statistics to assess urban farmers' perceived health and environmental problems. Most respondents were middle-aged (mean 35 years, 27.9% of the sample), married (69.2%), and formally educated (87.9%), with trading as the main occupation (47.5%) and crop production the most-practiced activity (38%). The most commonly perceived health problems were malaria, headache, and body pain, while unpleasant odor, air pollution from bush burning, and improper waste disposal were the most perceived environmental problems; chi-square tests found marital status (x²=9.53, P=0.05) and education (x²=18.45, P=0.05) significantly related to perceived health problems, and marital status (x²=23.84), education (x²=30.60), and primary occupation (x²=10.73, all P=0.05) significantly related to perceived environmental problems.

W. Van Averbeke · Water SA · South Africa (Pretoria)

This study in five informal settlements of Atteridgeville, Pretoria, South Africa, used a pilot study, household survey, and multiple case studies to assess urban farming's contribution to food security and household income. While over half of households participated in urban farming, its contribution to total household income and food security was generally modest. Main constraints included lack of space and limited access to irrigation water.

Remi Adeyemo, F. Kuhlmann · Tropicultura · Nigeria

This paper evaluates the efficiency of resource use in urban food crop production in five districts of two cities in southwestern Nigeria, based on an effective sample of 120 respondents. The analysis showed that urban food crop production is profitable, with an average revenue of N51,294 per hectare and a gross margin of N23,688. However, there was disequilibrium in resource use, with planting seeds and agrochemicals used efficiently, but land and labor used inefficiently, indicating that urban food crop production has not yet attained an optimum level of resource combination.

Bolanle Wahab, M. K. C. Sridhar, Aramide Ayorinde · Urban Agriculture Magazine · Nigeria (Ibadan)

The Sustainable Ibadan Project (SIP), established in 1994 by UNCHS (HABITAT), identified waste management and conversion to organic fertilizer as top priorities for Ibadan. Participants at a 1995 City Consultative Forum jointly identified aerobic composting technology using windrows as a viable method to collect and recycle waste, generate income, and use compost for urban agriculture.

Anges Yadouléton, Alex Asidi, Rousseau F Djouaka, B. James, Christian Agossou, Martin Akogbéto · Malaria Journal · Benin

A study in urban areas of Benin investigated the impact of rapid vegetable farming development on the emergence of insecticide resistance in Anopheles gambiae populations, using sociological data, bioassay tests, and biochemical analysis. The expansion of urban agriculture led to improper insecticide use for vegetable pests, exerting strong selection pressure on mosquito larval populations. This resulted in the emergence of insecticide resistance in malaria vectors, with permethrin mortality rates of 76% in Parakou, 23.5% in Porto-Novo, and 17% in Cotonou.

P. Kirai, J. Gachugi, Anne Scheinberg · Data Archiving and Networked Services (DANS) · Kenya (Nairobi)

The 'Converting City Waste in Compost Project' aims to develop a viable system for collecting, processing, distributing, and marketing organic city waste for urban and peri-urban agriculture in East Africa, particularly Nairobi. Phase one of this project involved an inventory and analysis of organic waste sources, quantifying and characterizing non-domestic organic waste streams in Nairobi City. This study presents the findings of phase one, providing a basis for evaluating the potential to divert Nairobi's organic waste for compost and biogas production.

Andreas Buerkert, Eva Schlecht, Martina Předotová, Rodrigue V.C. Diogo, Katja Kehlenbeck, Jens Gebauer · eScholarship (California Digital Library) · Sub-Saharan Africa

This study analyzed urban and peri-urban agriculture (UPA) systems in major Sub-Saharan African cities, measuring carbon, nitrogen, phosphorus, and potassium fluxes and conducting biodiversity studies. In Niamey, low-input gardens showed annual gaseous carbon emissions of 20-25 t ha-1, predominantly CO2, and high-input gardens irrigated with wastewater had annual CO2-C emissions of 27 t ha-1, with N2O as a major nitrogen loss contributor. Animal manure stored in the open was subject to large carbon and nitrogen losses, indicating environmental tradeoffs. However, UPA gardens in Niamey maintained a large variety of fruit and vegetable species, with richness increasing with garden and household size and commercialization.

Bruce Frayne, Jane Battersby, Robert Fincham, Gareth Haysom · · South Africa

This study examines urban food security in South Africa, focusing on Cape Town, Msunduzi, and Johannesburg, and includes a critique of the City of Cape Town's urban agriculture policy. The abstract indicates that the policy was found to have significant shortcomings, particularly concerning local production and access to food. The research highlights various policy issues related to food access, dietary diversity, local production, and local markets within these urban contexts.

Dzodzi Tsikata · · Sub-Saharan Africa

This chapter examines urban women's livelihoods in sub-Saharan Africa since the 1990s, focusing on economic liberalization and the expansion of the informal economy. Urban agriculture, including home gardens, is identified as an increasingly important activity within this informal sector. Many women in the urban informal economy are employed by others or have been in the past, while industrial subcontracting, a source of informal employment, has been significant only in a few industrialized Sub-Saharan African countries.

Olufunke Cofie, Adeoluwa Olugbenga, Philip Amoah · Urban Agriculture Magazine · Nigeria; Ghana

This study introduces human urine as an alternative fertilizer source for urban agriculture, presenting case studies from Nigeria and Ghana. It suggests that proper collection and use of human urine can improve urban environmental sanitation and reduce crop production costs. The approach integrates agriculture, environment, and sanitation sectors.

Sunday Ichima · Pranjana The Journal of Management Awareness · Nigeria

This paper examines urban farming as an important component of food security measures in Nigeria. It highlights the genesis of urban farming in Nigeria and the various types of urban farms, explaining how their products have contributed to food security.

Abegunde A. A, Emmanuel Olufemi Omisore, O. F. Oluodo, D O Olaleye · African Journal of Agricultural Research · Nigeria (Lagos)

A study in the Eti-Osa local government area of Lagos, Nigeria, investigated the socio-spatial effects of urban horticultural gardens. Of 75 identified gardens, 63 managers were interviewed, revealing that 79.4% of gardens were profit-oriented. Gardens had inadequate setbacks (mean 1.45 m) from roads, leading to off-street parking and traffic congestion. Only 20% of horticulturists aimed to improve urban aesthetics, indicating a need for urban planners to educate them to prioritize urban aesthetics over economic gain.

Y. A. Iyaka, SE Kakulu · African Research Review · Nigeria

This study determined the levels of copper (Cu) and zinc (Zn) in soil samples collected from cultivated farmlands near abandoned industrial sites in Minna and Bida, Niger State, Nigeria, using flame atomic absorption spectrophotometry. Concentrations ranged from 12-89 mg Cu kg-1 and 2.8-41 mg Zn kg-1 for Minna, and 2.4-6.5 mg Cu kg-1 and 0.57-36 mg Zn kg-1 for Bida. Apparent accumulation of Cu was found in Minna cultivated farmlands, with a mean Cu content of 24 ± 22 ppm, which was almost five times that of the control soils. Other mean values were similar to soil background averages.

Metasabia Solomon Mulugeta · Maynooth University ePrints and eTheses Archive (Maynooth University) · Ethiopia (Wolenchiti)

This qualitative study in Wolenchiti town, Ethiopia, identified determinants of livelihood strategies among female household heads. Major activities included petty trading, domestic services, daily labor, prostitution, and urban agriculture. Demographic factors like age and household size, and socioeconomic factors such as access to financial, human, social, physical, and natural capital, were found to be leading determinants.

Abdullah Al-Khater · Zenodo (CERN European Organization for Nuclear Research) · Africa

In Libyan cities, a six-month comparative study assigned older women to either a community gardening intervention group or a control group, collecting data through surveys, interviews and observations by trained researchers to assess food security. The intervention group showed a 20% increase in homegrown vegetable consumption compared to baseline levels.

Nigel L. Webb, Harrison Kasumba · Africanus Journal of Development Studies · South Africa

In Ezibeleni near Queenstown, Eastern Cape, South Africa, a sustainable-development framework was used to gather empirical findings on vegetable crop cultivation, covering duration of crop consumption, the value of produce to households, environmental benefits, and social/psychological benefits. Both the scale of cultivation and the benefits obtained were found to be modest, reinforcing prior studies that focused on the actual practice of urban agriculture rather than its hypothetical potential.

Bianca Ambrose‐Oji · · Sub-Saharan Africa

This book chapter reviews the role of urban and peri-urban agriculture in food security across sub-Saharan African cities and peri-urban areas, focusing on how the production and collection of indigenous vegetables along the rural-urban continuum contributes to it. Drawing on literature from geography, agriculture, ethnobotany and rural sociology, it defines urban agriculture and the spaces where indigenous vegetables are produced and collected, and closes with a typology for understanding the range of spaces involved in indigenous vegetable production and harvest, without presenting new empirical data.

Munguzwe Hichaambwa, Margaret Beaver, Antony Chapoto, Michael T. Weber, Hichaambwa, Munguzwe, Beaver, Margaret, Chapoto, Antony, Weber, Michael T. · AgEcon Search (University of Minnesota, USA) · Sub-Saharan Africa

An overview report based on the 2007-2008 CSO/MACO/FSRP food consumption survey in urban Lusaka, Kitwe, Mansa and Kasama, Zambia. It states that policies promoting demand-driven smallholder agriculture and improved urban food marketing system performance in Sub-Saharan Africa need to be grounded in careful food demand analysis, and that governments, donors and policymakers require an up-to-date understanding of urban consumption patterns, including the extent of and constraints on urban agriculture for household consumption and cash income. This excerpt does not present specific survey results.

Adedeji Adedeji, H Oludare, Ademiluyi · Journal of Geography and Regional Planning · Nigeria

This discussion of urban agriculture and urban land use planning in metropolitan Lagos, Nigeria, frames urban agriculture as a crisis response and survival strategy for the urban poor that contributes to food security, while stating that urban agriculture production systems can pose risks to public health and the environment through inappropriate or excessive use of agricultural inputs — including pesticides, nitrogen, and raw organic matter containing heavy metal residues. It recommends that urban land use planners promote multifunctional land use and greater community participation in managing urban open spaces.

Enslin Van Rooyen · Medical record news · South Africa

Focusing on the City of Johannesburg, South Africa, this policy discussion paper examines the potential of using the ward committee system—part of the South African local government structure—as a vehicle for urban farming programs. It argues it may be more efficient to direct limited resources toward helping urban residents become self-sufficient urban farmers rather than merely acquiring and distributing food, which sustains dependency on government, while noting that knowledge about effective administration for food security among developing-country municipalities is limited, with few Southern African municipalities having explicit policies and even fewer having successfully incorporated such programs; it recommends municipal decision-makers adopt an issue-driven, pro-poor growth approach, and states that urban farming is not inherently equivalent to Local Economic Development but may serve as a catalyst toward it.

Erastus K. Kang’ethe, Delia Grace, Thomas F. Randolph · East African Medical Journal · East Africa

This study synthesizes current knowledge on urban agriculture (UA) in East Africa, focusing on its human health impact. It identifies UA as an important source of food security, but notes that many zoonotic and food-borne diseases are associated with it, with a lack of evidence on human health impact and management. Major constraints include illegality and limited access to inputs and markets, indicating a need for more research to understand both positive and negative health impacts.