Research & reports

Achamyeleh Gashu Adam · African review of economics and finance · Ethiopia

In Ethiopia, all land is state-owned and granted to residents only as a holding right, with separate systems for rural and urban areas. Focusing on peri-urban agricultural land under growing pressure from urbanisation, this desk-review study analyzed existing survey research together with property-rights literature, theory, and current land-rights laws and policies. It found that new recipients of peri-urban land under the urban land-lease system obtain better and more extensive bundles of land rights than the indigenous, local peri-urban landholders who previously held that land.

Y. Saleh, Amul M. Badr, F. El Banna, A. Shahata · Science World Journal · Nigeria

Using a combination of remote sensing and GIS, this study assessed the rate of agricultural land-use change in the Kaduna metropolis, Nigeria, between 1980 and 2012, classifying and comparing four satellite images (Landsat MSS 1980, Landsat TM 1990, Landsat ETM+ 2005, and Nigeria Sat X 2012). The study found a significant reduction in agricultural land and continued disappearance of farmland over the period, which it links to loss of livelihoods, reduced food supply, and increased poverty. It states that this has raised concerns about the sustainability of urban and peri-urban agriculture (UPA) production in the study area, with small-scale farmers the most affected.

Otu W. Ibok · Asian Journal of Agricultural Extension Economics & Sociology · Nigeria

A study of food security determinants among 217 urban food-crop-farming households in three urban areas of Cross River State, Nigeria — Calabar, Ikom and Ugep — selected through two-stage sampling. Cross-sectional data from structured questionnaires and interviews were analyzed using a headcount index, food insecurity gap index, food surplus gap index and logistic regression. Results showed 52.5% of households were food secure and 47.5% food insecure; food-secure households exceeded the food security line by 44%, while 53% of food-insecure households fell below the poverty line. Logistic regression identified years of formal education, farming experience, farmer age, farming as the main occupation, household size, farm income and crop output as the main determinants of food security status.

Ande O.T, Adetunji A. M, Akinpelu M. E, Senjobi B.A · Journals & Books Hosting (International Knowledge Sharing Platform) · Nigeria

Ibadan metropolis, Nigeria, home to about 6 million people, has raised growing concern over lowland soils in its periurban area, where much of the industrial waste transported by the River Ona is deposited; these soils are used for dry-season farming and contribute to food security. This study aimed to characterize periurban lowland soils around Ibadan and determine their vulnerability to industrial pollution, using a 50m x 50m grid with surface samples taken at 50m intervals, plus representative profile pits described using the USDA method, and particle-size and chemical analyses (phosphorus, nitrogen, exchangeable cations Ca/Mg/Na/K, manganese, and heavy metals including lead, copper, zinc, chromium, iron, and cadmium). Results showed the floodplain's surface soil was fertile, with high nitrogen (0.35 cmol/kg), phosphorus (51.25 cmol/kg), and potassium (0.61 cmol/kg), and phosphorus levels ranging from very high to toxic, between 28.99 and 87.70 ppm. Average heavy metal concentrations were lead 34.30 mg/kg, zinc 171.20 mg/kg, iron 83.97 mg/kg, copper 19.11 mg/kg, manganese 31.10 mg/kg, chromium 0.69 mg/kg, and cadmium 0.3 mg/kg. Predicted soil-to-plant heavy metal transfer coefficients (Pb 35-343; Cr 0.46-4.6; Zn 171-1712; Cu 19-191; Fe 83-840; Mn 31-281; Cd 0.1-10) indicated crops grown in the area could contain toxic levels of these metals; however, high yields and healthy plant condition observed in the field, together with farmer interviews, suggested that the high phosphorus level (28.99-87 ppm) may have inhibited uptake of some metals such as lead, zinc, and copper.

Vide Adedayo, Mayowa Fasona, Taiwo Kuti · Journal of Geography and Geology · Nigeria

Using rainfall and temperature data from 1971 to 2006 alongside pesticide sales data from selected vendors and farmers, this study analyzed the relationship between climate elements, pest activity and pesticide usage in urban farming communities in Lagos, Nigeria. Rainfall was found to have increased by about 42 mm per year per decade and temperature by about 0.27°C per year per decade over the period. Maximum recorded temperatures were 32.6°C in February and 28.2°C in August. Pest activity was widespread during the dry season when temperatures were high, stimulating increased pest attacks on crops and increased pesticide use. Pesticide usage was estimated at roughly 30,000 liters in February and 15,000 liters in August.

C.F.A. van Wesenbeeck, Valentijn Venus, M.A. Keyzer, B. Wesselman, D. Asare Kye · · Africa

This study examined two tomato production areas in Burkina Faso with potential for counter-seasonal production aimed at Ghanaian urban markets, identifying the main obstacles to developing a horticultural supply chain: the monopsony power of Ghanaian traders and insufficient road quality causing high mechanical-damage losses in transport. Using a spatial-temporal simulation model to assess transport effects on tomato quality, the study found refrigerated transport is not a necessary condition for successful trade, since climate conditions alone do not severely harm quality, and concluded that regional diversification of exports offers Burkina Faso producers the best opportunities for improving their position in the chain, given the persistent trader monopsony and infrastructure constraints.

Workineh Ayenew · Developing Country Studies · Ethiopia

A study of 50 women selected by systematic sampling in Arba Minch town, Ethiopia, used logistic regression (maximum likelihood estimation) to examine determinants of women's saving behavior. Education attainment and age showed a negative influence on saving, but this was not statistically significant. Ownership of urban agriculture and income level had a significant positive effect on saving behavior, while access to credit and family size had a significant negative influence. Goodness-of-fit tests confirmed the model fit the data, and a robust heteroscedasticity test found no problems with model specification.

Gallaher C. M., Kerr J. M., Njenga M., Karanja N. K., WinklerPrins A. M. G. A. · Agriculture and Human Values 30(3):389-404 · Kenya

Studying sack gardening in Nairobi's Kibera slums, this paper shows vegetable production enhances household food security and, especially for households farming in groups, builds social capital among the urban poor.

· Agronomy · Africa (tropics)

Assesses low-cost eco-friendly net (EFN) covers as an affordable technology for sustainable cabbage seedling (nursery) production by small-scale growers. Net covering raised temperature and humidity, improved seedling growth, and reduced insect pest damage.

Chinenye Agbaje, Ogechi Nwachukwu · Zenodo (CERN European Organization for Nuclear Research) · Nigeria (Lagos)

This study investigated the efficacy of smart irrigation schemes to address water management challenges in urban rooftop gardens in Lagos, Nigeria. Employing a mixed-method approach with quantitative data analysis and qualitative interviews, it found that smart irrigation systems reduced water consumption by an average of 25% compared to traditional methods, with a 95% confidence level. The research provided robust evidence for the efficacy of smart irrigation schemes in urban rooftop gardens, offering policy recommendations for sustainable water management policies.

N E Etim, J J Dukiya · International Journal of Advanced Remote Sensing and GIS · Nigeria (Abuja)

A study in the Kuje area council of Abuja, Nigeria, used questionnaires and multi-temporal satellite images from 1975–2010 to assess urban encroachment on agricultural lands. It found that urban encroachment into agricultural lands is occurring at an alarming rate of 15.7 km² annually, resulting in a total loss of 509 km² of agricultural land to urbanization over 35 years.

AN Asadu, EM Igbokwe, JM Chah, IA Enwelu · Journal of Agricultural Extension · Nigeria (Enugu)

This study investigated farmers' perceptions of health and environmental hazards from urban livestock keeping in Enugu Urban, Nigeria, interviewing 75 heads of households. While all respondents were aware of general health and environmental implications, only 4.0% knew livestock could cause climate change. Identified environmental issues included crop destruction (89.3%), urban filth (89.3%), and noise (88.0%), while health issues included disease spread (50.7%), accidents (46.7%), and bad smell (86.7%).

Phil. Caleb Mireri · African Journal of Agricultural Research · Kenya (Kisumu)

This study surveyed 194 urban farmers in Kisumu municipality, Kenya, to assess urban agriculture's role in income, employment, and food supply. It found that most urban farmers and their employees receive very low income, with a mean monthly income of US$135 (US$0.64 per person per day), which is below the acceptable one dollar a day per person. Urban agriculture primarily supplements food requirements for the urban poor and provides income for a few commercial farmers.

Asadu A. N · DOAJ (DOAJ: Directory of Open Access Journals) · Nigeria (Imo State)

A study investigated gender roles in urban crop production in Imo State, Nigeria. Data were collected from 60 respondents via interview schedules, revealing that 60% of urban farmers were female with an average age of 40 years. Mixed cropping was the most common system, with cassava, maize, and Telfaria as major crops. Both men and women were involved in securing plots, and all family members participated in fertilization and harvesting. Weeding and processing were primarily done by women and girls, while men mostly handled chemical spraying.

Mansur Usman Dawaki, Abubakar U. Dikko, S. S. Noma, Umar Aliyu · Food and Energy Security · Nigeria

This study evaluated pollution risks to food security from urban agriculture in Kano, Nigeria, by sampling soil, water, and lettuce from two wastewater-irrigated sites (Challawa, Jakara) and a control site (Watari). Results showed all sites were contaminated with Cu, and the domestic wastewater site was slightly polluted with Pb and excessively polluted with Cd and Cr. Metal levels in irrigation waters exceeded recommended thresholds, and plants at the domestic wastewater site accumulated metal concentrations (Pb=26.21 mg/kg, Cd=1.03 mg/kg, Cr=28.63 mg/kg, Cu=2.66 mg/kg) that exceeded allowable limits in vegetables, indicating a human ingestion risk.

Femi Adesina, Ifunanya Oluwadamilola, Chinedu Akwu · Zenodo (CERN European Organization for Nuclear Research) · Nigeria (Lagos)

In 2013, the effectiveness of an awareness campaign promoting water conservation behaviors was investigated among 150 urban female gardeners in Lagos, Nigeria. A mixed-methods approach, including pre- and post-intervention surveys, found a significant increase from 25% to 48% in the adoption of water-saving irrigation techniques after the campaign. While the campaign was effective in enhancing knowledge and behavior, further tailored interventions are recommended for sustained impact.

Teferi Daba Lemma, M. S. A. Rao, M Prasada Rao · Zenith international journal of business economics and management research · Ethiopia

This study assessed the economic sustainability of urban agriculture in central Ethiopia, collecting primary data from 280 urban and peri-urban vegetable farmers. Findings indicated that urban agriculture is a viable livelihood strategy from a financial perspective. However, city administrations and policymakers pay little attention to supporting this sub-sector, suggesting that legal recognition and support would make it a more reliable strategy.

R. O. Yusuf · · Nigeria (Kaduna State)

In Zaria, Kaduna State, Nigeria, a study examined the contribution of urban farming activities utilizing water from excavation pits to farmers' income and food security, and the eco-supportive component of using these pits. Data were collected from 10 farmers between December 2011 and May 2012 through structured interviews and observation. Farmers cultivated various crops and obtained higher incomes from farming compared to their primary occupations. The utilization of excavation pits was found to be eco-supportive by regulating the microenvironment's water balance, serving as carbon sinks, and providing low-cost water extraction. However, observed constraints included insecure land tenure, disturbance from straying domestic animals, and theft of farm produce.

Chinedu Okafor, Uchenna Alex Anyaegbunam · Zenodo (CERN European Organization for Nuclear Research) · Nigeria

This mixed-methods study assessed the impact of school garden projects on the nutritional status of adolescents in Nigeria. Surveys, interviews, and observational studies were used to evaluate changes in dietary habits and health indicators among participants. The study found a significant 30% increase in daily vegetable intake among participating students compared to baseline data, indicating improved nutritional practices.

Mekonnen Getahun, Yihenew G. Selassie · Journal of Agricultural Science · Ethiopia

A study investigated the extent of contamination of soil, water, and vegetables from wastewater used for irrigation in urban agriculture in Bahir Dar and Kombolcha, Ethiopia. Soil, water, and vegetable samples were collected and analyzed. While heavy metal concentrations in soil were within permissible levels, wastewater samples showed high nitrate and phosphate levels, and boron concentrations in Borkena River and Lake Tana exceeded permissible limits for irrigation. Wastewater drained to Lake Tana exhibited high turbidity and very high BOD, and lettuce and Swiss chard accumulated higher levels of iron, manganese, and zinc.

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.

Dlamini Magagula, Khathi Khumalo, Nombuyisilwe Sithole, Kgosiwe Maseko · Zenodo (CERN European Organization for Nuclear Research) · South Africa (Cape Town)

This study in Cape Town, South Africa, investigated the impact of community gardens on food security among the urban poor using mixed methods, including ten years of household food expenditure surveys. Participating households showed an average 20% increase in fresh produce consumption compared to non-participants, directly impacting nutrition levels. The review concluded that community gardening projects can enhance food security and quality of life, but further research is needed on best practices, scalability, long-term sustainability, and the impact of diverse crop cultivation.

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.

Odewumi Odewumi · Journal of Geography and Regional Planning · Nigeria (Ibadan)

This study surveyed 145 farmers in two urban agricultural communities in Ibadan Metropolis, Nigeria, to examine their perception of climate change and its effects on urban agriculture. Results showed that 89.6% of respondents perceived climate change and increased variability over the past five years, with effects including temperature increases, fewer rainy days, and more rainstorms and floods. Multiple regression analysis indicated that farmers' socio-economic characteristics had no significant influence on their perception of climate variation effects.