Research & reports

Fuchaka Waswa, Duncan Gichabe, Ruth Kahuthıa-Gathu · Journal of the Kenya National Commission for UNESCO · Kenya (Ruiru)

This study investigated land use changes in Ruiru Sub-County, Kenya, from 1988 to 2024 using GIS. By 2024, agricultural land had decreased by 45.62%, while urban land use increased by 509%, and bare/rocky areas rose by 133% due to abandoned stone mining. The decline in agricultural land leads to reduced industrial crop areas and a shift to leafy vegetables, with an expected increase in agro-chemical use in intensive peri-urban farming.

Human Sciences Research Council · Figshare · South Africa

A 2025 study from South Africa's Western Cape used propensity score matching on data from 220 households — those participating in Department of Agriculture-funded backyard garden projects plus a control group — to assess urban agriculture's contribution to household food security. Households engaged in urban agriculture benefited from greater dietary diversity and income from selling produce, but the study found no significant positive contribution of urban agriculture to food security.

Ibukun Balogun, James S. Pryke, Temitope Kehinde, Michael J. Samways · Landscape and Urban Planning · Africa

A 2025 study investigated how insect pollinator diversity differs between gardens, agricultural areas and natural areas within a southern African urban mosaic composed of an urban core, farms and natural areas, and examined how urban green spaces influence pollinator taxonomic diversity. Direct observation and pan traps were used to assess pollinator diversity alongside measured environmental, floral and landscape variables. Results showed similar pollinator diversity between agricultural and natural areas for some taxa, and between agricultural areas and urban gardens for other taxa. Floral variables were the most important predictors of pollinators, with greater floral diversity ameliorating the effects of urbanization and agricultural intensification, while landscape context was significant but less important. Although results varied considerably among taxa, the findings suggest agroecological farming may buffer natural areas from urbanization effects and reduce urbanization's impact on pollinators in urban gardens by providing needed resources. The study identifies floral variables as important for urban green planning, achievable through establishing more flowering plants in human-modified areas such as semi-urban agricultural areas and urban gardens.

Verheyden, Johan G.L. · Zenodo (CERN European Organization for Nuclear Research) · Africa

This literature review examines the intersection of urban and peri-urban agriculture (UPA) and climate-smart agriculture (CSA) in the Great Lakes region of Africa — Kenya, Rwanda, Uganda and the Democratic Republic of Congo — a region undergoing rapid urbanization amid growing climate change vulnerability. It examines how CSA practices such as agroforestry, composting, water-efficient irrigation, and resilient crop varieties are being adopted and adapted within diverse UPA systems, synthesizes evidence on their impacts on food security, nutrition, environmental sustainability and socio-economic wellbeing, and analyzes the governance, policy and institutional factors enabling or constraining uptake. The review identifies critical research gaps, including the need for long-term impact assessments, locally adapted CSA strategies, effective governance models, and a better understanding of land tenure and nutritional outcomes, and outlines future research directions and policy recommendations with particular attention to Kenya's evolving urban landscape and devolution framework.

Ashagrie Gibtan, Wondwosen Abera, Mekuria Delelegn, Molla Maru, Adamu Emiru · Ochrana prírody Slovenska/Ekológia · Ethiopia

Land Use/Land Cover (LULC) dynamics were analyzed in four Ethiopian cities—Addis Ababa, Hawassa, Bahir Dar, and Adama—over 17 years from 2006 to 2022. SPOT 5 and Sentinel satellite imagery, key informant interviews, focus group discussions, and field observations were used. Findings revealed a rapid expansion of urban built-up areas, primarily at the expense of peri-urban horticultural lands, which has an adverse impact on the sustainability of urban agriculture.

Sayeh Kassaw Agegnehu, Reinfried Mansberger, Moges Wubet Shita, Derjew Fentie Nurie, Ayelech Kidie Mengesha · Land · Ethiopia

This study in the East Gojjam Administrative Zone, Ethiopia, examined factors affecting land rental transactions using data from 353 household heads affected by expropriation. 58% of respondents participated in both renting and renting out land. 60% of female-headed households engaged in land rental transactions (14% renting in, 46% renting out), while 38% of male-headed households rented land (19% renting out). Sex, landholding size, number of oxen, participation in off-farm activities, and extension service were identified as significant determinants. Oral agreements and sharecropping were the most prevalent transaction methods.

Ivica Petríková, Melvine Anyango Otieno, Gertrude Were, Mahmoud Eltholth, Ana Rodriguez‐Mateos, Seeromanie Harding, Victoria Hall Morán, Odipo Osano, Jennifer Cole · Food Security · Kenya

This study investigated the links between peri-urban households' engagement in agriculture, their dietary behavior, and their children's nutrition outcomes around Eldoret, Kenya. Survey data collected from 518 households indicated that peri-urban households involved in agriculture, particularly crop growing and sales, had more diverse and nutritious diets than non-engaged households. However, a significant improvement in children’s health outcomes in these households was observed only when coupled with improved water, sanitation, and hygiene conditions.

Kebede Tedila Tadesse · Journal of Food Technology & Nutrition Sciences · Ethiopia

This systematic review, conducted at Debre Berhan University, Ethiopia, assessed the role of horticulture in adopting climate-smart agriculture (CSA). Ethiopia's agriculture, which is the backbone of its economy, is adversely affected by climate variability and extreme events. CSA is presented as a primary solution to sustainably increase productivity, enhance resilience, reduce greenhouse gas emissions, and achieve food security. The principles of horticulture, including urban and peri-urban agriculture, silviculture, and agroforestry, are highlighted as having a strong capacity to adopt CSA.

Hailekiros Tadesse Tekle, Desta Berhe Sbhatu, Gebreselema Gebreyohannes · H2Open Journal · Ethiopia (Mekelle)

A study in Hadnet district, Mekelle, Ethiopia, assessed heavy metal concentrations in wastewater, spring water, and three leafy vegetables (lettuce, spinach, cauliflower). Wastewater samples from four experimental sites exceeded permissible limits for 4 out of 10 heavy metals (Cd, Cr, Cu, Mn), and spring water from a comparison site also exceeded limits for 4 metals (Al, As, Cd, Cu). Leafy vegetables grown in the least contaminated experimental site showed high concentrations for 6-7 out of 10 heavy metals, with lettuce and spinach having elevated levels of As and Al, respectively. The study concluded that the wastewater used for irrigation is not safe, the farm soils may have accumulated significant heavy metals, and the cultivated vegetables are highly contaminated, necessitating regulation of wastewater use for irrigation.

Jean de Dieu Minengu, Aiko Ikonso Mwengi, Romain Kawanga, Simon Mwengi, Oscar Mangunda Yama · Revue Africaine d’Environnement et d’Agriculture · Africa

Market gardening in Kinshasa's urban and peri-urban areas faces multiple constraints, including land insecurity, low natural soil fertility, the incidence of diseases and pests, weak technical support, climate hazards, poor input supply, and problematic marketing systems. These constraints limit yields in production sites and hinder the development of market gardening activities.

Reyes Tejada N., Kooy M., Zwarteveen M. · Water International · Mozambique (Maputo)

A study grounded in the Infulene Valley, Maputo's main green belt, showing that irrigated urban agriculture drawing on various water sources has been consistently present throughout the Mozambican capital's history. The authors trace how urban planning evolved from 1960 onwards and what those policies meant for urban farming and the livelihoods depending on it. Documenting the city's imaginaries across four eras of Maputo's development, they find that agriculture occupied a prominent place in the post-colonial city and remains significant despite its vague recognition within urban planning after the shift to neoliberalism, and argue for acknowledging urban irrigated agriculture as an intrinsic feature of the city.

Arcadius Martinien Agassin Ahogle, Sammy Letema, Gertrud Schaab, Veronica Ngure, Abraham R. Mwesigye, Nicholas Kibet Korir · Frontiers in Soil Science · Kenya (Nairobi)

This study assessed heavy metal and trace element contamination risks in peri-urban farmlands in Nairobi city catchment, Kenya, by analyzing 60 soil samples from ten vegetable farming zones. Results showed elevated concentrations of elements including As, Cd, Mn, Pb, and Zn, with some exceeding permissible agricultural thresholds. As, Cd, Hg, and Pb exhibited high ecological risks, with Cd contributing 46-66% of the overall risk.

F.E. Awoyelu, R.A. Mebo · Agro-Science · Nigeria (Osun State)

This study assessed the effects of artisanal sand mining on peri-urban agriculture in Ife East and Ife Central Local Government Areas, Osun State, Nigeria, from 2015 to 2019. Data from 120 respondents (landowners, cultivators, residents) showed that cultivated land area decreased by 24.8% (from 48% to 23.2%), while sand-mined area substantially increased by 20.4% (from 14.6% to 35%). Landowners' decision to part with land for sand mining increased with age, household size, and farming as primary occupation, but decreased with higher education levels.

Chinwe Okonkwo, Ifeoma Nwachukwu, Adebayo Adeyemi · Zenodo (CERN European Organization for Nuclear Research) · Nigeria (Ibadan)

This systematic review synthesized evidence on the determinants of adoption and disadoption of improved cassava planting material (ICPM) by peri-urban smallholders in Ibadan. The review found that disadoption rates can exceed 40% within three seasons post-initial adoption. Perceived Usefulness was the strongest adoption predictor, while Perceived Ease of Use was often compromised by logistical barriers, and vendor trust influenced continued use.

Peter Sanjo Adewale, Sunday Clement Olubunmi Makinde, V. Kusemiju · Journal of Environment and Sustainable Development · Nigeria (Lagos)

This mixed-method study in Lagos State, Nigeria, examined the effects of Urban and Peri-urban Vegetable Production (UPVP) on farmers' livelihood subscales using a Household Livelihood Survey and Focus Group Discussion. The findings indicate that all livelihood subscales (Physical, Natural, Financial, Social, Human) were positively and significantly impacted by UPVP, with a moderately high overall impact. The study concludes that UPVP can be a resilient sector for the economy and sustainable development.

Navjot Sangwan, Luca Tasciotti · Agriculture · Sub-Saharan Africa

This cross-country study analyzed household data from nine Sub-Saharan African countries to investigate the impact of urban agriculture (UA) on household food expenditure and dietary diversity. Using an inverse-probability weighted regression adjustment method, the study found that households engaged in UA reduced overall food expenditure and increased spending on protein-rich foods like nuts, legumes, fruits, dairy, meat, and poultry. The impact of UA varied substantially across the food expenditure distribution.

Xolile Mkhize, Bonginkosi E. Mthembu, Carin Napier · Journal of Agriculture and Food Research · South Africa (Durban)

This study in Umlazi Township, Durban, South Africa, assessed food and nutrition insecurity in an urban informal settlement through a household survey (n=200), vendor survey (n=25), anthropometric data, and land ecotope data. Findings showed that over 67.0% of informal dwellers were unemployed, surviving on a household food budget under US$115.1 per month, and 73.0% of households lacked access to land for cultivation. The study concludes that land accessibility for food production is restricted, contributing to food insecurity.

Tadesse Wudu, Adimasie Kassaw · International Journal of Horticulture and Food Science · Ethiopia

An observational study in Sirinka, Ethiopia, in October 2018, investigated grafting 30-day-old tomato seedlings onto 20-day-old potato seedlings to create "pomato" plants for urban agriculture. Successful graft unions were observed after two weeks, with plants producing both tomatoes (average 18 fruits, 954g per plant) and potato tubers (4-5 tubers, 219.27g per plant). The experiment confirmed the success of the graft, suggesting its potential for home gardeners.

Enagnon Arsène Euloge YAOVI, Martial WOROU, Bola A. MALOMON, Sylvain A. VISSOH · International Journal of Progressive Sciences and Technologies · Africa

This research in the Arrondissement of Zinvié, Africa, investigated agricultural land governance through surveys of 109 people and field observations. Findings indicate rapid urbanization is causing anarchic land occupation and uncontrolled consumption of agricultural space, with renting being the dominant land access mode (50%). From 2010 to 2020, cultivable land decreased by 517.69 hectares due to urbanization, highlighting significant governance challenges.

Gamuchirai Chakona · · South Africa

A study surveyed 314 randomly selected households in four peri-urban settlements in South Africa to assess dietary diversity and food security. Findings revealed generally low dietary diversity and high levels of food insecurity across all sites, with male-headed households experiencing worse conditions than female-headed households. Food insecurity was linked to high poverty, unemployment, and low education levels.

Anne-Louise Fritz, Ramia Jannoura, René Beuschel, Christoph Steiner, Andreas Buerkert, Rainer Georg Joergensen · Chemical and Biological Technologies in Agriculture · Africa

This 2-year study in semi-arid Ouagadougou and sub-humid Tamale, West Africa, measured the effects of biochar and N fertilization on soil microbial biomass carbon, fungal ergosterol, and functional diversity. Sole biochar addition did not affect soil chemical or biological properties, but biochar with N fertilization increased microbial respiratory response. N fertilization decreased soil pH by 1.1 units in both cities, and a pH of 4.7 led to reduced microbial biomass carbon and ergosterol contents in Tamale. An N fertilizer-induced decline in soil pH below 5 should be avoided, as it decreased microbial biomass carbon and microbial functional diversity.

Felix Chari, Bethuel Sibongiseni Ngcamu · Environmental & Socio-economic Studies · Sub-Saharan Africa

This narrative review searched Scopus, the Directory of Open Access Journals, Web of Science, Google Scholar and Academic Search (EBSCO) using terms including "urban farming," "urban agriculture" and "climate change" to synthesize literature on climate change's effects on urban agriculture in sub-Saharan African cities. While reviewed studies agree that climate change affects urban agriculture from production through processing, storage and distribution, integrated literature on the topic remains scarce, and the extent and magnitude of impacts differ by region, meaning adaptation and mitigation strategies cannot be applied universally and must instead be context-specific.

Abdelkarim Hamrita, Daniel Ferrer Jiménez, Hichem Rejeb · Frontiers in Sustainable Cities · Africa

A 2022 study analyzed the peri-urban agrifood system of the Sousse urban agglomeration, one of the most important in Tunisia, from a landscape perspective. It finds that clearly deficient regulations combined with uncontrolled urban development, together with intersecting political, environmental and economic factors, are threatening the survival of a traditional, largely family-based agricultural model built on mixed or polyculture production with predominant olive groves — a model the study describes as vital to the economic maintenance of many families and to food security. Using the Landscape Character Assessment methodology, the study proposes a landscape-project tool to strengthen the resilience and sustainability of peri-urban agriculture and prevent the loss of landscape heritage. It also points to the importance of integrating green infrastructure into land-use planning and to the need to promote Agricultural Parks, a protected status already recognized in Spain and other countries, putting forward specific proposals for the Sousse peri-urban agricultural landscape while insisting on the need to reform current forms of governance.

L. Tchoumi, Youta Happi J., Tchiadeu G.M. · Zenodo (CERN European Organization for Nuclear Research) · Sub-Saharan Africa

This study examined the impact of agricultural development on peri-urban ecosystem dynamics in Obala, north of Yaounde, Cameroon, using literature review, questionnaire surveys, semi-structured interviews, direct observation and Landsat satellite imagery from 1973, 1988, 2001 and 2020 analyzed with SPSS and ENVI. Between 1973 and 2020, mature forest declined from 5,694.23 ha to 1,635.25 ha, degraded forest grew from 123.56 ha to 1,739.80 ha, secondary forest fell from 10,298.13 ha to 9,993.43 ha, and savanna expanded from 3,891.8 ha to 5,819.25 ha, showing that expansion of food, market-garden and cash crops such as cocoa, combined with population pressure, is degrading peri-urban ecosystems.

Felix Chari, Bethuel Sibongiseni Ngcamu · Climate · Africa

In Masvingo City, Zimbabwe, a structured questionnaire administered to urban livestock farmers, triangulated with in-depth interviews with livestock stakeholders, examined how climate change-related hazards affect the urban livestock industry. Heatwaves, floods and droughts were found to significantly harm the industry: farmers lose livestock to disease, poor pastures and extreme weather, while the hazards also damage storage and distribution of livestock products, labour supply and productivity, and the profitability of livestock enterprises. The study calls for further research on location-specific adaptation strategies.