Research & reports

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.

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.

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.

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.

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.

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.

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.

Pay Drechsel, Olufunke Cofie, R. van Veenhuizen, Theophilus O. Larbi · Irrigation and Drainage · West Africa

Informal irrigation in urban and peri-urban agriculture (UPA) in West Africa offers benefits but is often hindered by water pollution, threatening public health. A multi-stakeholder process implemented since 2005 in six West African cities, including Accra, Ghana, aimed to integrate UPA into sustainable urban development. However, an internal lesson learned was that local partners may not prioritize every project, and capacity-building efforts might not provide expected incentives for commitment.

BF Salahu, TO Dauda · Moor Journal of Agricultural Research · Nigeria

The food security status of farming households in Ibadan metropolis, Nigeria, was assessed using 89 questionnaires. The study analyzed urban farming and food security factors (energy and protein levels). Education related to urban farming practices was found to influence the food security status of the respondents.

M. B. David · African Affairs · Kenya

This study on urban agriculture in the Kenyan town of Nakuru illustrates health and environmental problems associated with keeping livestock in urban areas, the small size of plots cultivated, and the dependence of urban households on rural sources of food. These findings were observed in the context of economic hardships occasioned by structural adjustment programmes since the 1980s.

Voster Ineke H.J, Jansen van Rensburg Willem, Van Zijl J.J.B, Venter Sonja L · African Journal of Food Agriculture Nutrition and Development · South Africa

In South Africa, traditional leafy vegetables have been labeled as weeds since the 1960s, leading to a negative perception and unwillingness to use them. Awareness activities in six communities, including training sessions in seven schools and eight community gardens, aimed to improve the status of these crops. These activities resulted in increased awareness of their poor conservation status, appointment of seed keepers, and a noticeable increase in demand for seeds and production training.

Halidou Koanda · Infoscience (Ecole Polytechnique Fédérale de Lausanne) · Sub-Saharan Africa

In Sub-Saharan Africa, faecal sludge management practices are often financially unviable due to widespread lack of municipal involvement, paucity of legal provisions, and absence of stakeholder coordination. This leads to indiscriminate dumping of faecal sludge in urban areas or its untreated use in urban agriculture. These practices pose permanent and serious health risks and contaminate scarce ground and surface water. This research aims to develop an innovative strategic planning approach for sustainable urban faecal sludge management to minimize public health and environmental risks.

Wilfred Subbo · University of Nairobi Research Archive (University of Nairobi) · Kenya (Nairobi)

This paper discusses strategies for sustainable food production in Nairobi, Kenya, aiming to supplement rural food supplies and improve urban health through fresh, accessible food. It argues for discarding the attitude that food can only be produced in rural areas and explores the linkage between sanitation and urban food security. Additionally, the paper offers suggestions for mechanisms to increase food production in Nairobi.

Olufunke Cofie, R. van Veenhuizen, Pay Drechsel · · Sub-Saharan Africa

Urban and peri-urban agriculture (UPA) significantly contributes to food supply, employment, livelihoods, and poverty alleviation in many Sub-Saharan African cities, providing diverse foods including perishable items. However, UPA production often carries health risks from polluted urban water and faces challenges due to limited semi-official recognition and support from city authorities, sometimes conflicting with planners regarding land tenure and water use. More data is needed for appropriate recognition of this sector.

Tony Binns, Roy Maconachie, Adamu Idris Tanko · Land Degradation and Development · Nigeria (Kano)

This paper examines health and environmental concerns associated with urban and peri-urban agriculture (UPA) in Kano, Nigeria. Empirical evidence indicates that industrial and domestic toxins are reaching dangerously high levels, leading to significant pollution of soils and water channels. This raises serious questions about the sustainability of UPA and the long-term health implications of toxin exposure.

Ogunyemi Awodoyin, Taliat Opadeji · Emirates Journal of Food and Agriculture · Nigeria (Ibadan)

A 2003 study in Ibadan, Nigeria, investigated heavy metal contamination of Amaranthus cruentus L. grown on domestic refuse landfill soils. Lead (Pb) and Cadmium (Cd) concentrations in soils from four landfill sites and a control site ranged from 110.5 to 678.5ppm for Pb and 2.01 to 3.20ppm for Cd. Metal accumulation in Amaranthus cruentus L. tissues was proportionate to soil Pb concentrations, while Cd levels in crop tissues exceeded soil levels. Crop growth and yield were significantly reduced due to Pb and Cd contamination, leading to the conclusion that Ibadan landfills are unsafe for Amaranthus cruentus cultivation, with heavy metal concentrations in the vegetable tissues much higher than FAO/WHO dietary allowances.

Bright Agyeman, Kofi Owusu Afriyie · Zenodo (CERN European Organization for Nuclear Research) · Africa

Among primary school students in Ghana, who have limited access to fresh fruits and vegetables, a mixed-methods study combining pre- and post-intervention surveys with focus group discussions (n = 300) assessed changes in nutritional knowledge and behavior following a school garden program. After the program, the proportion of students eating at least one fruit daily rose statistically significantly (p < .05) from a baseline of 20% to 45% post-intervention. The findings indicate school garden programs effectively improve nutrition-related behaviors among Ghanaian primary school students, suggesting a need for replication and expansion.

Sipho Maseko · Zenodo (CERN European Organization for Nuclear Research) · South Africa (Cape Town)

To evaluate the impact of community gardening on urban nutrition security in Cape Town slums, a mixed-methods study was conducted over two years. Data collected through surveys and interviews revealed a statistically significant increase in dietary diversity (p < 0.05) among community gardeners compared to a control group. This study confirmed the positive impact of community gardening on urban nutrition security and diet quality in Cape Town slums.

Haile Meskel Balcha · Food and Nutrition Bulletin · Ethiopia

World Vision Ethiopia launched a Micronutrient Program in October 1998 to improve the micronutrient status of mothers and children, promoting vitamin A–rich food production. By 1999, 11,708 backyard gardens, 275 school gardens, and 77 community gardens were developed, contributing to household food security and income. The program found that vitamin A–rich vegetable production was well accepted, sustainable, and cost-effective, but faced challenges with the availability and cost of imported seeds.

Chinwe Okonkwo · Zenodo (CERN European Organization for Nuclear Research) · Nigeria (Lagos)

A study in low-income Lagos neighborhoods, Nigeria, qualitatively explored the perceived impact of urban vertical farming projects on household dietary diversity. Data were collected through in-depth interviews with 24 household primary food providers participating in vertical farming initiatives and focus group discussions with project facilitators. Participants reported a marked increase in regular consumption of leafy green vegetables, and a "substitution effect" was observed where savings from home production were redirected to purchase other nutrient-rich foods.

A. Mboganie-Mwangi, Dick Foeken · Leiden Repository (Leiden University) · Kenya (Nairobi)

A 1996 study in Nairobi, Kenya, compared the food security and nutritional status of low-income households engaged in urban agriculture with those not farming. It found that urban farmers primarily produced for home consumption and faced theft as a major problem. While the Undugu Society Urban Agriculture Project (USUAP) group showed better food situations and higher energy and protein intakes than other groups, all three groups had inadequate energy intake on average. The long-term beneficial effect of urban agriculture on nutritional status was negligible.

Kenneth Lynch · Sustainable Development · Africa

This paper examines Agenda 21's Chapter 7 on sustainable human settlements and surveys the growing body of publications on food supply to urban areas in the less developed world, with a particular focus on fruit and vegetables, urban agriculture, and food marketing. It discusses the main aspects of Agenda 21's Chapter 7 relating to sustainable human settlements and the role emerging research on urban food systems can play in establishing sustainable development in cities of less developed countries, with particular attention paid to Dar es Salaam, Tanzania.