Research & reports

Delphine Manka’abusi, Désiré Jean‐Pascal Lompo, Christoph Steiner, Mariko Ingold, Edmund Kyei Akoto-Danso, Steffen Werner, Volker Häring, George Nyarko, Bernd Marschner, Andreas Buerkert · Journal of Plant Nutrition and Soil Science · Sub-Saharan Africa

To quantify carbon and nitrogen losses in urban and peri-urban agriculture soils in West Africa, this study measured CO2-C, N2O-N, and NH3-N fluxes from irrigated fields in Ouagadougou, Burkina Faso, and Tamale, Ghana, under different fertilization and (waste)water regimes. Compared with unamended controls, fertilizer application increased average cumulative CO2-C emissions by 103% over eight cropping cycles in Ouagadougou and by 42% over seven cropping cycles in Tamale. Total emissions across all cropping cycles reached 14 t C/ha in Ouagadougou — 73% of the carbon applied as organic fertilizer over two years at that site — and 9 t C/ha in Tamale. Fertilizer application increased N2O-N emissions in Ouagadougou by 37-360% across cropping cycles and NH3-N losses by an average of 670%, but had no significant effect on N2O-N losses in Tamale. Wastewater irrigation did not significantly raise CO2-C emissions in Ouagadougou, but in Tamale CO2-C emissions were 71% higher on wastewater plots (1.6 t C/ha) than on controls (0.9 t C/ha); wastewater had no significant effect on N2O-N or NH3-N emissions at either site. Biochar did not affect N2O-N or NH3-N losses but could help reduce CO2-C emissions from urban garden soils.

Georgette N. Ngweme, Dhafer Mohammed M. Al Salah, Amandine Laffite, Periyasamy Sivalingam, Dominique Grandjean, Konde Nkiama Numbi Joël, Crispin K. Mulaji, Florian Breider, John Poté · The Science of The Total Environment · Africa

This study investigated levels of persistent organic pollutants (POPs) in irrigation water, soil, and Amaranthus viridis from gardening sites in Kinshasa, Democratic Republic of the Congo, to assess environmental and human health risks. A survey of pesticide and fertilizer use was conducted with 740 market gardeners, and POPs (organochlorine pesticides, PCBs, PBDEs, and PAHs) were analyzed in irrigation water and 144 vegetable samples. The highest PAH levels were found in A. viridis at all sites studied; the sum of seven PCB congeners ranged from 15.89 to 401.36 ng/g; chlorpyrifos-ethyl and p,p'-DDE were the predominant OCPs detected; and among PBDEs, only BDE47 was quantified at notable concentration in the plants, with none detected in irrigation water. Higher estimated daily intake values indicated that consuming the leafy vegetables could be associated with increased health risks, though calculated incremental lifetime cancer risk values indicated no potential carcinogenic risk for the local population. The study recommends implementing urban agriculture control programs for POPs and fertilizer use in Kinshasa to protect public health.

Isaac Otieno Dawo, George Mark Onyango, Francis Ang’awa Okere · International Journal of Sciences: Basic and Applied Research · Africa

A cross-sectional survey of urban farmers in three towns in western Kenya — Eldoret (n=137), Kakamega (n=145) and Kisumu (n=158) — examining how local governance institutions' economic, social and environmental roles influence urban agriculture (UA) practice. A stratified sample of 205 respondents (63 in Eldoret, 68 in Kakamega, 74 in Kisumu) completed questionnaires and key-informant interviews. The department of agriculture, livestock and fisheries was identified as the most important institution promoting UA, cited by 64.8% of respondents in Eldoret, 42.2% in Kakamega and 40.0% in Kisumu. Pearson correlation showed a statistically significant moderate positive relationship between county government institutional roles and UA practice (n=205, r=.532, p<.05).

N. K. Fidelis, M. K. Winnie, W. K. Joyce, K. Juliana, Kotey Ashie Daniel, M. Scholastica, Mbijjiwe Jacob Kathure Catherine · Journal of Engineering in Agriculture and the Environment · Africa

In Nairobi, Kenya, stratified random sampling, field surveys and questionnaires were used to identify existing water sources and wastewater treatment systems and their reuse status, in an investigation of the potential for eco-friendly urban and peri-urban agriculture (EcoUPA). Of the 300 respondents interviewed, only 66 (22%) reused wastewater, and only 54 of those reused it for crop production. Ninety-eight respondents (33%) wanted information on wastewater treatment systems allowing reuse, and 124 (41%) were willing to pay for a new system. The findings indicate that limited urban water sources constrain the spread of urban and peri-urban agriculture.

Ezeano Ike, Ibe E.C., Osuji C.N · Research Journal of Food and Nutrition · Nigeria

In Mgbirichi, Ohaji-Egbema Local Government Area, Imo State, Nigeria, this study assessed integrated urban agriculture—combining crop, livestock, and fish subsectors—as a livelihood strategy and its contribution to household income, using descriptive statistics. The large majority (98.5%) of urban farmers practicing integrated farming concentrated on crop-livestock combinations, while fish-livestock and crop-livestock-fish integration were each adopted by only 0.75% of farmers, indicating that most urban farmers did not practice the fish subsector.

F.O. Okechukwu, CL Ezeonyeche, E.J Nnodim, U.I Nnubia, CJ Abonyi, EC Eze · ResearchSpace (University of Auckland) · Nigeria

A cross-sectional survey investigated teachers' perceptions of early childhood education's role in promoting moral and intellectual virtues among pupils in Nsukka urban, Enugu State, Nigeria, drawing a sample of 176 early childhood education teachers from 42 randomly selected schools out of a population of 876 teachers across 82 public and private primary schools. Data, collected via questionnaire, were analyzed using mean, standard deviation, and Pearson's correlation coefficient. Respondents identified group projects, daily morning assembly, tending the school garden, role-playing, picnics, excursions, and community service among the activities that promote virtues in pupils, citing truthfulness, humility, respect, and patience as commonly promoted moral virtues and courage, curiosity, attentiveness, and thoroughness as intellectual virtues. No significant relationship was found among teachers' years of experience, school ownership, educational qualification, perceptions of virtue-promoting activities, and the extent to which they promoted them. Challenges cited included inadequate supply of learning materials, poor educational funding, inadequate adult-child ratio, poor time management, and lack of parental involvement.

Akakpo D. B., Achigan-Dako E. G. · Agronomy · Benin

Interviews with 360 respondents across three southern Benin villages on three traditional leafy vegetables, analyzing how use and knowledge transmission from parents to children vary by generation, gender, and village.

Nolwazi Z. Khumalo, Melusi Sibanda · Sustainability · South Africa

This paper assessed the food security status of 208 households (109 urban and peri-urban agriculture (UPA) practicing, 99 non-UPA practicing) in Tongaat, eThekwini Municipality, South Africa. While a greater proportion (54%) of UPA practicing households consumed more than six food groups compared to non-UPA households (40%), a Mann-Whitney U test (U = 5292, p = 0.808) found no significant difference in dietary diversity between the two groups. Employment status, access to arable land, land tenure, and household monthly income were significantly associated with food security status.

· Journal of Animal and Plant Sciences (J Anim Plant Sci ) ISSN 2071 – 7024 · Africa

A study in Port-Bouët, Abidjan, examined market gardeners' phytosanitary practices and pesticide residue incidence on lettuce. It found that 39.6% of pesticides used were not recommended for market gardening, 86.84% of gardeners did not protect themselves during application, and 80.26% did not observe pre-harvest intervals. Consequently, 93.33% of lettuce samples did not comply with Codex Alimentarius and EU standards due to high pesticide residue contamination.

Habtamu Abebe · International Journal of Environmental Sciences & Natural Resources · Ethiopia

This cross-sectional study in Arbaminch town investigated community awareness of climate change and the perceived role of urban agriculture for climate resilience using a structured questionnaire. It found that 87.2% of respondents were aware of climate change, primarily through media (70.7%), family/friends (63.4%), and public meetings/seminars (28%). A significant association was observed between respondents' age, education level, and occupation with both climate change awareness and the perception of urban agriculture's importance for climate change intervention.

Tinashe P. Kanosvamhira, Daniel Tevera · African Geographical Review · South Africa (Cape Town)

This paper investigated urban agriculture as a source of social capital in Mitchells Plain, a low-income neighborhood in Cape Town, South Africa. Using a mixed-methods approach combining a questionnaire survey and in-depth interviews, the findings showed that urban agriculture increases social interaction among urban gardeners and the community. Non-governmental organizations and government actors were also found to be crucial in enhancing social interaction within the community.

Thulasizwe Mkhabela · · Southern Africa

This chapter examines trends in large and urban agricultural markets in Africa, focusing on Southern Africa and using South Africa as an example. It notes the increasing importance of urban agriculture markets due to growing urban populations, purchasing power, and changing consumer preferences. The chapter analyzes the evolution of these markets, including the rise of alternative marketing channels like farmers' markets, and discusses the linkages between rural and urban areas in food marketing, suggesting policy interventions to enhance urban agricultural markets.

Cosmos C. Alamanjo, Abimbola O. Adepoju, H. Martin, R.N. Baines · Zenodo (CERN European Organization for Nuclear Research) · Nigeria (Jos)

This mixed-methods study investigated farmers' perceptions, willingness, and capacity to use household sewage sludge as organic resources for peri-urban agriculture around Jos, Nigeria. Farmers were found to use a complex mix of fertilizers and were keen to utilize household sewage sludge for soil fertility, though constrained by accessibility. A critical finding was that household sewage sludge observed in the field is heterogeneous due to its proximity to urban refuse disposal, raising concerns for possible cross-contamination of pollutants and indicating a lack of extension guidance.

Hendrick J. Bruins · · Africa

This paper discusses drought mitigation in urban and peri-urban Africa, where severe droughts threaten food production under rainfed agriculture. It argues that while urban and peri-urban farming's informal private sector should not be government-controlled, the treatment and use of urban wastewater in agriculture requires government planning, investment, and extension services. Participatory development is suggested to integrate central wastewater planning with private farmer use.

Valerio Bini, Maria Bottiglieri, Egidio Dansero, Andrea Magarini, Yota Nicolarea, Roberto Sensi · · Africa

This paper explores urban food policies from a Global South perspective, focusing on African cities and their unique urbanization processes and city-food linkages. It describes an overview of initiatives in African cities, aligning with the New Urban Agenda and Milan Urban Food Policy Pact, to promote new forms of cooperation among cities, universities, research bodies, and civil society organizations. The paper aims to identify cross-cutting issues like land tenure, climate change, and urban agriculture to compare cases across different African perspectives.

Nicole Paganini, Stefanie Lemke, Inês Raimundo · ECONOMIA AGRO-ALIMENTARE · Sub-Saharan Africa

This research explored the potential of urban agriculture in Cape Town, South Africa, and Maputo, Mozambique, through two baseline surveys among urban farmers and home gardeners, as well as qualitative in-depth interviews. Findings indicated that urban farmers and home gardeners add nutrients and diversity to their diets and can partly contribute to their income. However, in Cape Town, main challenges included access to local and external markets, fair pricing, and sovereignty in production.

Chinwe Okonkwo, A. Bello · Open MIND · Nigeria (Maiduguri)

This study investigated the role of urban community gardening programs in generating social capital among 312 internally displaced persons in Maiduguri, Nigeria. A cross-sectional survey across three displacement-affected wards measured bonding, bridging, and linking social capital. Participation in community gardens was significantly associated with increased bonding and bridging social capital, with 78% of respondents forming new trusted relationships across ethnic or village backgrounds. Frequency of garden participation positively predicted perceived community solidarity.

Nicolette Tamara Jonkman, Esmee D. Kooijman, Karsten Kalbitz, Nicky Pouw, Boris Jansen · SOIL · Kenya (Kisumu)

This study in Nyalenda urban gardens, Kisumu, Kenya, investigated how female farmers' knowledge and practices influence soil nutrient status. Soil analysis revealed that intercropped fields had significantly lower total soil nutrients than fields with only manure, despite cowpeas theoretically increasing soil N. Female farmers' knowledge was limited to practical and sensory aspects, and intercropping did not increase soil nutrient content due to socioeconomic factors like poverty.

Nicolette Tamara Jonkman, Boris Jansen · Current Opinion in Environmental Sustainability · Sub-Saharan Africa

This literature review on urban agriculture (UA) in Sub-Saharan Africa (SSA) identifies a significant constraint: conflicting stakeholder perceptions of UA, which hinders its development into a sustainable business. Some view UA as illegal and unsustainable, while others see it as a means to food security and employment. The review highlights a knowledge gap regarding land-use history and its effect on UA soil composition and nutrient status, proposing that UA sustainability requires understanding this historical context to build inclusive business models.

Mawuna Donald Houessou, B.G.J.S. Sonneveld, Augustin K. N. Aoudji, Fréjus THOTO, Smith A. R. Dossou, D. J. Snelder, Anselme Adégbidi, Tjard de Cock Buning · Sustainability · Benin

A study explored and compared international standards of prevailing organizations and their functioning among 261 urban gardeners in two cities in Benin. It found that a vast majority of urban gardeners are members of a cooperation. However, their membership is largely titular because gardeners mostly behave semi-autonomously, and few decisions are taken collectively. The obvious economic advantages of leveraging bargaining power, reducing transaction costs, and increasing possibilities for loans are seriously underutilized.

Kouassi Joseph Kouakou, Ahoua Edmond Sika, Seu Jonathan Gogbeu, Koffi Bertin Yao, M. Bounakhla, Denézon Odette Dogbo, Yves‐Alain Bekro · · Africa

This study compared the accumulation potential of five trace metals (cadmium, copper, lead, zinc, and nickel) in lettuce, spinach, and amaranth grown at market gardening sites in Abidjan, Côte d’Ivoire. Using principal components analysis, it was found that lettuce had a greater capacity for accumulating these metals compared to spinach and amaranth. Amaranth and spinach from the three sites showed nearly identical metal accumulation capacities.

Hailay Aregawi Hagos · European Journal of Business and Management · Ethiopia (Dire Dawa)

This study aimed to prioritize alternative business enterprises based on their feasibility in Dire Dawa city, Ethiopia. Primary data were collected via questionnaires from 202 judgmentally selected micro and small enterprises. Descriptive analysis showed that urban agriculture, manufacturing, service, construction, and trade sectors are the top five feasible sectors, respectively, in terms of market, technical, financial, and organizational parameters. The study concludes that entrepreneurs should undertake a preliminary feasibility study before starting a business.

Zebenay Shitaye · Developing Country Studies · Ethiopia

This study investigated the role of Urban Agriculture (UA) in improving household income and dietary diversity in Bure and Finoteselam Towns, Ethiopia. A survey was conducted with 242 respondents from two Kebeles, selected based on their UA potential and existing training, and data were analyzed using SPSS. Major reasons for UA engagement included earning additional income (57.6%) and employment opportunities (18.5%). UA significantly enhanced dietary diversity for practitioners, particularly in the consumption of tuber roots, vegetables, fruits, eggs, legumes, and milk. However, constraints included inadequate extension support and training, shortages and high costs of inputs, inconvenient working places, lower product prices, transportation problems, and price manipulation by middlemen.

Erik Engel, Karin Fiege, Anja Kühn · · Africa

The UFISAMO project analyzed urban agriculture (UA) in Maputo and Cape Town. In Maputo, UA is the main income source for about 5% of the population, though it often does not cover monthly food costs, and a major challenge is the uncontrolled application of pesticides due to mono-cropping. In Cape Town's townships, UA plays a negligible role in income and food security due to small plots, sandy soils, water stress, and weak market links.

John Wakhanu, Hudson Nyambaka, Judith Kimiywe, Mildred Nawiri, Wilson Thagana · Journal of Food Science and Engineering · Kenya (Machakos County)

This study in Kangundo and Kilalani primary schools, Machakos County, Kenya, investigated the impact of African Indigenous Leafy Vegetables (AILVs) on children aged 6-10 years (N=66 in Kangundo, N=46 in Kilalani). Over two phases (13 and 12 weeks), an experimental group consumed AILVs from school gardens, while a control group did not. Endline analysis showed that the experimental group had significantly higher (p < 0.001) % Fat Free Mass, mean serum iron, and zinc levels compared to the control group.