Research & reports

Teferi Daba Lemma, M. S. A. Rao · · Ethiopia

This study assessed the social and environmental sustainability of urban and periurban agriculture (UPA) in selected towns of Ethiopia, using primary data from 280 households via questionnaires and interviews. The findings indicate that the environmental and health aspects of UPA sustainability are compromised by extensive use of chemical inputs. Furthermore, UPA is inclined to be unsustainable from a social and political perspective.

Adedayo A, A. M. Tunde · Sustainable Agriculture Research · Nigeria (Kwara State)

This study assessed the challenges faced by women farmers in urban areas of Kwara State, Nigeria. A total of 1,801 women farmers were sampled from different urban areas, and Focus Group Discussions were conducted. Matrix ranking revealed that lack of credit facilities was one of the most significant challenges hindering increased production by women. Other identified challenges included restricted accessibility to land and a lack of farm input.

CDR Aza-Gnandji, Yongxin Xu, Lincoln Raitt, Jonathan Levy · Water SA · South Africa (Cape Town)

This study explored the salinity of irrigation water from the Cape Flats aquifer in the Philippi farming area of Cape Town, South Africa, collecting water samples from boreholes and ponds in summer and winter. Concentrations of chloride, nitrate, potassium, and sodium exceeded target maximum limits set by DWAF and FAO guidelines. Groundwater and pond water were found to be brackish in most parts of the research area, with salinization primarily attributed to agricultural activities. The water is generally suitable for irrigation but requires caution for salt-sensitive vegetables.

Marijke D’Haese, Nick Vink, Tharcisse Nkunzimana, Ellen Van Damme, Johan van Rooyen, Anne-Marie Remaut, Lotte Staelens, Luc D’Haese · Development Southern Africa · South Africa

Food insecurity remains high in rural KwaZulu-Natal province, South Africa. This study collected data from 390 beneficiary households in 2010 to assess the perceived impact of the Empowerment for Food Security Programme, launched in 2007, on food security. Findings confirmed that experience-based food insecurity levels were still high, despite the agricultural support program and government income transfers. However, respondents attributed improved dietary diversity and better access to resources to the program.

Doreen Atkinson · African Journal of Range and Forage Science · South Africa

This paper critiques the assertion that commercialization of smallholder agriculture poses dangers for sustainable rangeland management in South Africa. It argues that a range of policy options are required, including commercialization and subsistence farming, large-scale and smallholder farming, various land tenure options, rural and peri-urban farming, and part-time farming. The case of municipal commonage land is used to demonstrate the effectiveness of flexible policy options regarding land ownership, farming scale, and the social nature of farming, but it is noted that effective institutional development is a key requirement in all cases.

Roseline J. Akinlade, Olubunmi Lawrence Balogun, Adekemi A. Obisesan, Akinlade, Roseline J., Balogun, Olubunmi L., Obisesan, Adekemi A. · AgEcon Search (University of Minnesota, USA) · Nigeria

This study analyzed the determinants of commercialization among 230 urban vegetable farmers in Oyo and Lagos states, southwest Nigeria, using primary survey data and a Tobit model. It found that farmers' participation in domestic and regional markets remains low due to various constraints, notably poor market access. The average farm size was 0.05ha, and the average market participation index was 0.73. Factors influencing commercialization included age, farm size, association membership, education, distance to market, and input costs. The study concluded that social capital significantly affects market participation, and recommended proactive support from governments and NGOs to facilitate farmer organizations and market linkages.

Evaristo Mwaba Kapungwe · Open Journal of Metal · Africa

Water, soil, and crop samples were analyzed by atomic absorption spectrometry for lead, copper, cobalt, nickel, and chromium at two peri-urban wastewater-irrigation farming sites in Zambia: New Farm Extension in Mufulira Town, Copperbelt Province, and Chilumba Gardens in Kafue Town, Lusaka Province. Heavy metal levels in wastewater, soil, and food crops exceeded acceptable limits at both sites, confirming contamination and a potential human health risk from consuming the crops grown there.

Léon W. Nitièma, Boubacar Savadogo, Dramane Zongo, Aminata Kaboré, Poda Jean Noël, Alfred S. Traoré, Dayéri Dianou · Journal of Environmental Protection · Africa

This study examined the microbial quality of wastewater used for truck farming in Ouagadougou, Burkina Faso, testing for bacterial and parasitological fecal indicators during the dry-hot season (May) and the wet season (July) of 2012. Wastewater from three water reservoirs and two canals intensively used for truck farming was analyzed, and the same indicators were tracked through waste stabilization ponds at three treatment plants in the city. Concentrations of microbial indicators were significantly higher in the dry-hot season than the wet season across all sampling sites, with levels reaching up to 53,800 CFU/100ml for E. coli, 8,200-108,400 CFU/100ml for fecal coliforms, 650-45,000 CFU/100ml for fecal streptococcus, and 0-2.4 eggs/l for helminths. Through the waste stabilization ponds, significant microbial concentration drops of 82-100%, 78-98%, 60-100%, and 82-88% respectively were recorded between the anaerobic and maturation ponds. The results indicate that improving the refining performance of waste stabilization pond technology could help reduce the health risks associated with wastewater reuse in urban agriculture in developing countries.

G. N. Egwu, John O. Agbenin · Archives of Agronomy and Soil Science · Nigeria

A study in northern Nigeria assessed cadmium, lead, and zinc contamination in soils and leaf vegetables (amaranthus, lettuce) irrigated with untreated wastewater. Total cadmium and zinc concentrations in soils exceeded safe limits, and lead and cadmium in edible portions of amaranthus and lettuce exceeded safe limits for human consumption by 7–17 times. The permissible limit for lead established for agricultural lands may not be suitable to ensure produce safety in urban and peri-urban agriculture in Kano.

A. Yusuf · · Nigeria (Lagos State)

This study assessed the attitudes of 50 women farmers towards urban agriculture in the Somolu local government area of Lagos State, Nigeria. Findings indicated that the women's attitude towards urban agriculture was extremely negative. Statistical analysis revealed a significant relationship between attitude and age, marital status, educational level, years of experience, and access to loans. However, farm size, annual income, access to labor, and access to inputs were statistically insignificant.

Nancy Karanja, Mary Njenga, G.K. Mutua, Carl Johan Lagerkvist, E. Kutto, JJ Okello · Journal of Agriculture Food Systems and Community Development · Kenya (Nairobi)

A study in three peri-urban sites in Nairobi, Kenya, assessed heavy metal, nitrate, and pesticide residue levels in wastewater-irrigated kale. Elevated levels of boron, cobalt, chromium, copper, lead, zinc, and nickel were found in vegetables at two sites, with high soil loadings of nickel, arsenic, lead, chromium, copper, and zinc attributed to chicken manure. Pesticide residues of diazinon, cypermethrin, biternol, and profenofos exceeded permissible limits in kale at one site, suggesting consumers may ingest significant amounts of contaminants.

Mary Caesar, Jonathan Crush, Trevor Hill · Scholars Commons (Wilfrid Laurier University) · South Africa (Msunduzi Municipality)

A study on food security in Msunduzi Municipality, South Africa, was part of AFSUN's baseline survey across eleven Southern African cities. The survey found that urban poor in Msunduzi are significantly worse off than those in Cape Town and Johannesburg, with one-third of households reporting frequent food shortages. Urban agriculture is not particularly significant in Msunduzi, and while supermarket supply chains dominate the food system, they do not meet the needs of the poor.

Sebastian U. Ugbaje, John O. Agbenin · International Journal of Environmental Studies · Nigeria

A pot experiment in Zaria, northern Nigeria, evaluated the chemical forms and phytoavailability of Cr, Ni, and Pb in savannah soil amended with two urban wastes and planted with sorghum. While urban waste application increased total metal concentrations in the soil, only Pb uptake by sorghum increased, with no corresponding increases for Cr and Ni. A single application of urban wastes significantly increased Pb uptake by sorghum, raising concerns about the long-term consequences of such applications in urban and peri-urban agriculture, especially regarding children's exposure to Pb.

Vide Adedayo · · Nigeria

A study of poultry waste management and utilization techniques in urban vegetable farms in metropolitan Lagos revealed that poultry waste is poorly collected, packaged, and transported. Proper knowledge on treatment is lacking due to insufficient skill, space, time, and capital. Furthermore, a significant difference was found between poultry waste utilization, crop yield, and revenue in the study area.

Catherine Rwamba Githuku · Abstracts of postgraduate thesis · Kenya (Nairobi)

This study investigated soil and crop pollution levels resulting from untreated wastewater reuse for irrigation in Kibera and Mailisaba wastewater irrigation farms in Nairobi, Kenya. Analysis of irrigation water, soil, and crop samples (maize, kales, black nightshade, arrowroots) revealed that the Electrical Conductivity (EC) of irrigation water at Mailisaba exceeded recommended levels. Farmers reported adverse effects on crops due to wastewater quality, and despite awareness of health risks, many farmers confessed to not using protective clothing.

John Jacob, Samuel E. Kakulu · American Journal of Chemistry · Nigeria

Soil and vegetable samples (spinach, jute mallow, and tomato) were collected from farms and gardens across 20 zones within Kaduna, Nigeria, plus two rural control villages about 30 km from the city, and analyzed for heavy metals by Flame Atomic Absorption Spectrophotometer. Pollution Load Index results showed soils in the city farms were moderately enriched with cadmium and chromium and strongly enriched with lead and nickel from anthropogenic sources. Mean soil concentrations of lead and cadmium exceeded WHO/FAO permissive limits for agricultural soil (nickel and chromium did not), while vegetable metal concentrations exceeded the permissive limits for every metal except nickel — a finding flagged as concerning given the toxicity of lead and cadmium in particular, which have no known biological use.

Jonathan Crush, Bruce Frayne, Wade Pendleton · Journal of Hunger & Environmental Nutrition · Sub-Saharan Africa

A paper on rapid urbanization and rising urban poverty shifting the historical locus of food insecurity from rural areas to the cities of Africa uses baseline survey data from the African Food Security Urban Network (AFSUN), carried out in 11 cities in 9 southern African countries in 2008-2009, to demonstrate extremely high levels of urban food insecurity. It finds that lack of access to food results primarily from household poverty, high unemployment, and limited income-generating opportunities rather than any absolute food shortages. The paper also shows the growing importance of supermarkets, and finds that urban agriculture plays a relatively insignificant role in the food sourcing strategies of the urban poor.

Chinedu Agbakoba, Funmilayo Olayiwala · Zenodo (CERN European Organization for Nuclear Research) · Nigeria

A paper framed as addressing a research gap on eco-friendly pesticide use strategies among urban farmers in Lagos State, Nigeria, health impacts, and environmental protection (2012) states that it conducted a structured literature review with thematic synthesis of key findings. However, the abstract's actual content is limited to generic mathematical-formalism language — establishing "bounded error under perturbation," a "convergent estimation process under stated assumptions," a "stable link between the proposed metric and observed outcomes," and an empirical specification described as a linear regression form (Y expressed as a linear function of X plus an error term) — and does not report specific data or results on actual pesticide practices, measured health impacts, or environmental protection outcomes among Lagos urban farmers. It closes by calling on stakeholders to prioritize inclusive, locally grounded strategies and improve data transparency.

Luc Hippolyte Dossa, Andreas Buerkert, Eva Schlecht · Human Ecology · Sub-Saharan Africa

A study surveyed 700 randomly selected households across Kano (Nigeria), Bobo Dioulasso (Burkina Faso), and Sikasso (Mali) to explore the relationship between household socioeconomic status (SES) and participation in urban and peri-urban agriculture (UPA). The results showed no significant differences in UPA participation rates across socioeconomic groups. Instead, UPA participation was significantly and positively related to household size.

Stephen Odede. Shisanya, Sheryl L. Hendriks · Development Southern Africa · South Africa

This study evaluated the contribution of community gardens to alleviating food insecurity for 53 community gardeners in Maphephetheni, KwaZulu-Natal, South Africa. Using the Household Food Insecurity Access Scale, it was found that 89% of these households were anxious about food supplies, consumed insufficient food, and were severely food insecure. Additionally, 72% consumed poor quality food. Community gardens were unable to solve the problem of food insecurity, but their contribution to consumption cannot be entirely ignored.

M. Tshitangoni, A. Okorie, Joseph Francis · Scientific Research and Essays · South Africa

In Vhembe District, Limpopo Province, South Africa, the performance of 30 poverty alleviation projects (12 community gardens, 8 poultry, 2 piggery, 2 bakery, 6 other) was reviewed. Based on structured questionnaires with 108 respondents, project performance differed by type. All bakery projects were successful, poultry projects achieved 62% success, and community garden and other projects each achieved 33% success. In contrast, all piggery projects performed poorly.

A. K. Ango, Aliyu Abdullahi, Bello Bunza Abubakar · International Research Journal of Agriculture and Soil Science · Nigeria (Birnin Kebbi)

A study in Birnin Kebbi metropolis, Nigeria, during the 2009/2010 cropping season surveyed 100 urban farmers across 10 districts. The study found that urban farmers cultivate food crops and rear animals, but identified low capital, lack of adequate funds, strict land-use regulations, and lack of agricultural inputs as major problems. Socio-economic status, family size, and education level were significantly related to participation in urban farming.

Bertrand Foe, Salou Zoulkilf · · Benin

A transverse case study conducted from January to June 2011 in Cotonou, Benin, with 50 truck farmers, investigated adaptation strategies for water access in urban agriculture. The study found that increased temperatures and irregular rains reduce available water, making truck farming difficult and painful. Despite increased working time, production decreased by about 50%, indicating a negative economic impact.

H.S. Geyer, Bennie Schloms, Danie du Plessis, Amanda van Eeden · DOAJ (DOAJ: Directory of Open Access Journals) · South Africa (Cape Town)

An analysis of agricultural land consumption within the Cape Town urban edge between 2002 and 2007 revealed that low-density residential development is the primary consumer of high-potential agricultural land. Commercial, industrial, and informal residential developments had minimal impact on agricultural land loss. High-potential agricultural land is not adequately protected, and urban agriculture is constrained by competition with more profitable land uses like residential development.

Jonathan Crush, Alice J. Hovorka, Daniel Tevera · Progress in Development Studies · Africa

This article examines the contemporary importance of household food production in poor urban communities across 11 Southern African Development Community (SADC) cities. It finds that urban food production is not particularly significant in most communities, with many more households relying on supermarkets and the informal sector for food access. Furthermore, few households derive income from selling produce, though the situation varies considerably by city.