Research & reports

Jonathan Crush, Bruce Frayne · Journal of Southern African Studies · Southern Africa

This article reviews urban food sources in Southern African cities, focusing on supermarket expansion, its impact on informal food suppliers, and the relative insignificance of urban agriculture for poor urban households. Findings from an eleven-city survey by AFSUN are presented, highlighting that urban agriculture has limited significance in addressing urban food insecurity in the region.

Romborah Simiyu, Dick Foeken · · Kenya

This chapter reviews national and Eldoret Municipal Council laws and policies related to Urban Agriculture (UA) in Eldoret town, Kenya. It assesses how these policies have shaped the livelihoods of urban farmers and the development of UA as a strategy for urban dwellers. The chapter also reflects on recent developments towards a more facilitative policy framework for UA at the national level.

I. K. Adewumi, Adebanji Samuel Ogbiye, E. O. Longe, David O. Omole · Covenant University Repository (Covenant University) · Nigeria (Ota)

This study assessed the impact of industrial wastewaters discharged into River Atuwara in Ota, Nigeria, on water quality using standard physical and chemical analyses and QUAL2K software. The majority of water quality parameters exceeded maximum permissible concentrations, with BOD at ≥ 31 mg/L, COD at ≥ 181 mg/L, and alkalinity at ≥ 138.4 mg/L. High concentrations of heavy metals, including Cadmium, Pb, Zn, Fe, and Mn, were detected, indicating an environmental hazard for riparian users.

S. A. Materechera · African Journal of Agricultural Research · Africa

A study of soil salinity in irrigated fields used for urban agriculture in a semi-arid region of South Africa. It compares sodium levels (19.3 vs. 9.8), pH (7.13 vs. 6.3) and electrical conductivity ECe (22.1 vs. 7.9 dS/m) between topsoil and subsoil layers, finding that calcium, magnesium and potassium (unlike sodium) were higher in the top than the subsoil layer, while pH and ECe did not differ significantly by depth overall. By irrigation method, basin irrigation produced the highest accumulation of calcium, magnesium, potassium and sodium, followed by drip and then sprinkler irrigation, with the same ranking (basin > drip > sprinkler > control) for pH and ECe; sprinkler irrigation was the only method showing higher pH and ECe at 10-20 cm depth than at 0-10 cm. The study concludes that irrigation is increasing soil salinity and points to the need for sound irrigation water management, particularly appropriate irrigation scheduling.

Haruna Haruna · · Africa

A study of soils irrigated with sewage water on Fadama floodplain land in northern Nigeria used sequential extraction to determine the mobility and availability of cadmium, copper, nickel, lead and zinc. The residual fraction held the largest pool of all five metals, but 2.7-70.2% was present in the potentially available, non-residual fraction. Contamination by cadmium and nickel was less severe than by lead, copper and zinc, and mobility/bioavailability ranked Pb > Zn > Cu > Ni > Cd.

Morongoa Rosina Pako · · South Africa

This qualitative study assesses the Mogabane Community Garden Project in South Africa to determine why it did not reach its objective of poverty reduction in the community. It situates the project against South Africa's poverty lines — roughly 33% of the population living on less than R271/month, 50% on less than R422/month, and 79.1% on less than R1,230/month, with the highest poverty rates in the Eastern Cape (68.3%) and Limpopo (60.7%) provinces and the lowest in the Western Cape (20%) and Gauteng (28.8%) — and the government's post-1994 anti-poverty programs spanning social assistance, employment generation, enterprise development, basic household security, social services, disaster relief, and employment-related social insurance. Against this backdrop, the study assessed the Mogabane project and confirmed that it failed to achieve its poverty-reduction objective.

Mohammed Murtala Ruma, Abdullahi Usman Sheikh · African Journal of Environmental Science and Technology · Nigeria (Katsina)

This paper investigated the status of wastewater reuse in urban farming in Katsina, Nigeria, by interviewing 120 households out of 250 registered with the Katsina Urban Planning Authority. It was found that wastewater reuse in urban farming is a full-time, sole income earner for many households and is indispensable for this semi-arid city. However, the urban planning process has not officially recognized or given attention to this important activity.

M. Tshitangoni, A. Okorie, Joseph Francis · Scientific Research and Essays · South Africa (Limpopo Province)

A study conducted in Vhembe District, Limpopo Province, South Africa, assessed challenges faced by 30 poverty alleviation projects (community gardens, poultry, etc.). A survey of 108 beneficiaries identified numerous inception-based challenges, such as lack of training (90%), lack of funds (80%), and fraudulent use of funds (33%), as well as operation-based challenges like poor record keeping (70%) and unavailability of markets (60%). These challenges were found to significantly limit the performance of the poverty alleviation projects.

Dick Foeken, Samuel Owuor, Alice Mwangi · Children Youth and Environments · Kenya

A survey was conducted in almost all primary and secondary schools in Nakuru Town, Kenya, to examine the extent to which school farming contributes to school feeding programs. The survey found that while school farming and feeding programs are common practice, school farming substantially contributes to school feeding programs in relatively few cases.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Anselm A. Enete, Anthonia Ifeyinwa Achike · Outlook on Agriculture · Nigeria (Ohafia)

A study comparing rural and urban farmers in Ohafia, southeast Nigeria, found that while urban farmers used significantly more purchased inputs than rural farmers, their output was significantly lower. This was attributed to urban farmers being poor and undercapitalized, preventing them from using adequate purchased inputs to maintain soil nutrients. The findings suggest that for urban agriculture to address urban food insecurity, the urban poor require sufficient financial empowerment.

Dick Foeken · · Africa

This study analyzed the relationship between urban policy and the practice of urban agriculture by the poor, based on two studies in Nakuru Municipality, Kenya, and Morogoro and Mbeya Municipalities, Tanzania. The legal and policy setting in these towns was found to be confusing, and the poor generally do not benefit from policy measures, if policies exist at all.

Adnew, Walelign · National Academic Digital Repository of Ethiopia · Ethiopia

This study assessed the general performance and challenges of Micro and Small Scale Associations (MSSAs) in Wolkite and Boutajira city administrations, using questionnaires for 92 operators and interviews with 5 officials. Findings revealed that government supports have not ensured the sustainability of these associations, and service provision is not aligned with national strategy. MSSAs exhibit high closure rates, member dropout, fail to create long-term jobs, and show insignificant women's participation.

I. Ogunlade, O. I. Oladele, A. A. Falaki · University of Dar es Salaam Library Journal · Nigeria

This study investigated the socio-economic characteristics, information needs, and seeking behavior of 100 urban farmers in Ilorin metropolis, Kwara State, Nigeria, using a structured questionnaire. It found that urban farming was a supplementary activity for highly literate individuals, with farms mainly within the city and more animal than crop production. The study suggested that urban farmers could achieve better results if technical and financial support were provided, and recommended official government recognition for urban farming.