Research & reports

Shahzad Kouser, Mr. Abedullah, Abdus Samie · The Pakistan Development Review · Pakistan (Faisalabad)

This study, conducted in 2006 with 200 farmers in two peri-urban villages of Faisalabad, Pakistan, estimated the economic values of negative health externalities from wastewater use in cauliflower production. While wastewater use appeared profitable without considering externalities, factoring in health costs strongly discouraged its use. The health externalities for a three-month cauliflower crop on 741 acres amounted to Rs 3.2 million, and for 5,283 acres of vegetables cultivated with wastewater in Faisalabad, the annual total was Rs 90.7 million. The findings indicate a significant economic loss due to wastewater use, suggesting that installing a water treatment plant is a viable option to minimize these external effects.

Justin Stoler, John R. Weeks, Arthur Getis, Allan G. Hill · American Journal of Tropical Medicine and Hygiene · Ghana (Accra)

A 2003 study in Accra, Ghana, surveyed 3,164 women to examine the relationship between self-reported malaria and proximity to urban agriculture (UA). The odds of self-reported malaria were significantly higher for women living within 1 km of UA compared to those living near an irrigation source, with the association disappearing beyond this distance. Malaria prevalence was often elevated in communities within 1 km of UA, even with more favorable socioeconomic characteristics.

Stefan Dongus, Dickson Nyika, Khadija Kannady, Deo Mtasiwa, Hassan Mshinda, Laura Gosoniu, Axel Drescher, Ulrike Fillinger, Marcel Tanner, Gerry F. Killeen, Márcia C. Castro · Geospatial health · Tanzania (Dar es Salaam)

A cross-sectional survey in urban Dar es Salaam, Tanzania, investigated the influence of agricultural and geographical features on Anopheles larvae presence. The study found that agricultural areas, covering over 5% of the 16.8 km2 study area, had a 1.7 times higher proportion of habitats containing Anopheles larvae compared to other areas. However, breeding sites originating from urban agriculture accounted for less than a fifth of all malaria vector breeding sites in the city.

Lei Yan-hua · · Australia

This paper discusses the state of therapeutic horticulture in Australia, describing the field as largely project-driven with little government or philanthropic funding to sustain long-term growth. It notes that recent initiatives in community gardens, school and children's gardens, and horticultural therapy services have expanded the scope of activity and, while still small compared with many other countries, are high-profile, community-led, and have secured significant government funding. However, the paper states that this needs to be balanced against numerous barriers facing the sector: insufficient research, limited organization and representation, few education and training opportunities, and a lack of outreach and community services.

Sophie Graefe, Eva Schlecht, Andreas Buerkert · Outlook on Agriculture · Niger (Niamey)

Semi-structured interviews with 130 households in Niamey, Niger, characterized urban and peri-urban agriculture (UPA) and assessed resource use. The study found high use of livestock manure and indiscriminate use of nutrient-loaded wastewater for irrigation, leading to significant nutrient surpluses in UPA gardens. Initial calculations suggested large gaseous emissions of nitrogenous compounds and and leaching of nitrogen, phosphorus, and potassium to groundwater.

Eveline Klinkenberg, Philip J. McCall, Michael D. Wilson, Felix P. Amerasinghe, Martin J. Donnelly · Malaria Journal · Ghana

This study investigated the impact of urban agriculture on malaria transmission risk in Accra, Ghana, through larval and adult mosquito surveys. It found that Anopheles spp. and Culex quinquefasciatus outdoor biting rates were three and four times higher, respectively, in areas around agricultural sites compared to areas far from agriculture. The annual Entomological Inoculation Rate (EIR) was also higher in agricultural areas (19.2) than non-agricultural areas (6.6), suggesting that urban agricultural areas may increase malaria transmission risk by providing resting sites for adult mosquitoes.

Sue Wells · Western CEDAR (Western Washington University) · Tanzania

This paper examines the transferability of six Smart Growth concepts to Tanzanian cities (Dar es Salaam, Arusha, Mwanza, Dodoma, Zanzibar) given their extreme poverty and agrarian base. Primary research conducted in May-June 2007 and related publications were used. The study suggests that Smart Growth strategies from the Global North may be unsuitable for the Global South, indicating that urban agriculture in this context presents both a promise and a problem.

Friedhelm Streiffeler, Elsamawal Khalil Makki, Ali Ayoub · Econstor (Econstor) · Sudan (Khartoum)

This research in Greater Khartoum, Sudan, investigated urban and peri-urban agriculture as a livelihood strategy for internally displaced persons. While urban agriculture significantly reduces absolute poverty, its implementation faces many problems due to natural, economic, and social differences in the new environment, resulting in a low degree of agricultural development. Migrants with smaller fields and lower agricultural development showed a greater desire to return to their homeland, and social integration also influenced the decision to stay or return.

Chris Hillbruner, Rebecca Egan · Food and Nutrition Bulletin · Bangladesh (Dinajpur)

A study in Dinajpur, Bangladesh, from 2002 to 2003, investigated the impact of seasonality on food security and nutritional status in approximately 600 low-income urban households. Data collected through surveys and child measurements revealed significantly higher rates of food insecurity, wasting, and inadequate growth during the monsoon season compared to the dry season. While dietary diversity and lost work due to weather were identified as pathways affecting food security, child illness was not found to be a significant mechanism contributing to seasonal nutritional declines.

Bernard Keraita, Pay Drechsel, Flemming Konradsen · Journal of Risk Research · Ghana

A study in Ghana used participatory research methods to summarize farmers' perceptions of health risks and risk reduction measures in urban vegetable farming irrigated with untreated wastewater. Farmers were aware of health risks from wastewater, perceiving occupational skin infections as the greatest risk, while consumer health risks were rated very low. Many international risk reduction measures were deemed unsuitable by farmers, who preferred simple, low-cost alternatives.

Wei Xu · Chinese Journal of Population Resources and Environment · Global

This study examines the interaction between the sustainable development of urban agriculture and the increase in peasants' income, treating them as a combined system. It identifies a synergistic relationship between increased peasant income and urban agriculture development, but also a competitive relationship between maximizing short-term income and ecological sustainable development. The research suggests that a sustainable urban agricultural resource allocation mechanism can foster coordination and positive interaction, with urban circular agriculture economy being a basic strategy for this coordination.

Tamara García–Armisen, Josué Prats, Yociel Marrero, Pierre Servais · Water Science & Technology · Cuba (Havana)

The Almendares River in Havana, Cuba, receives wastewater from over 200,000 inhabitants, resulting in very poor microbiological water quality downstream due to high faecal bacterial indicators (FBIs). This water is used for urban agriculture and recreation, despite not meeting microbiological standards. This study compared FBI removal in three wastewater treatment plants (WWTPs): a conventional facility, a constructed wetland (CW), and a solar aquatic system (SAS). Natural systems (CW and SAS) showed approximately two log units higher FBI removal efficiency than the conventional plant. The large conventional WWTP was found to have a negative impact on the river's microbiological quality.

J.N. Hogard, Julius N. Fobil, Godfred K. Ofosu-Budu, D. Carboo, Nii‐Ayi Ankrah, Alexander K. Nyarko · · Ghana

This study in Ghana investigated the macro-nutrient content and heavy metal concentrations in solid waste composts to assess their potential for soil fertility amelioration and health implications in urban and peri-urban agriculture. Overall NPK concentration was low, with agricultural waste composts showing higher total N, K, and organic carbon than municipal solid waste (MSW) composts. Heavy metal concentrations for Ni, Zn, Cu, and Cd were generally low and within Australian standards. However, lead (Pb) concentration in mixed MSW composts was significantly high during the dry season, exceeding the Australian limit of 150 mg/kg Pb for unrestricted use. Seasons and composting processes were found to be important determinants of toxic metal concentrations in final compost products.

Bernard Keraita, Pay Drechsel, Flemming Konradsen · Water Science & Technology · Ghana (Kumasi)

A study in Kumasi, Ghana, assessed the use of on-farm ponds to reduce microbial contamination in wastewater-contaminated irrigation water, analyzing over 300 samples. It found that while ponds are common, their potential for pathogen removal via sedimentation is not fully optimized. Helminth eggs reduced by about 70% with careful water collection, but thermotolerant coliforms took six days in the dry season to meet WHO guidelines, indicating suboptimal performance for some pathogens.

R. Machiridza, Emmanuel Manzungu · University of Zimbabwe Institutional Repository (University of Zimbabwe) · Zimbabwe (Harare)

Perceptions of urban agriculture in Harare, Zimbabwe, shifted from prohibition before 1980 due to environmental concerns to de facto government policy after independence due to increasing urban poverty. Land was initially allocated to co-operatives primarily for political support, creating tension between political patronage and environmental protection. Critics argue that authorities only accepted urban agriculture's reality two decades post-independence, driven by its potential for poverty reduction and economic development.

Irenio Curbelo Tribicio · OBSERVATÓRIO DE LA ECONOMÍA LATINOAMERICANA · Cuba

A research project conducted at the Granja Urbana (Urban Farm) of Sancti Spíritus municipality, Cuba, aiming to apply and evaluate a set of economic and financial analysis tools within the category of "labor force and wages," in order to determine the factors influencing the interrelationship and variation of gross value added (VAB), labor productivity, and average wage. The abstract states only the study's aim and object of analysis; it does not report specific findings or figures from the evaluation.

Bertha Camacho Tuckermann · Knowledge Management for Development Journal · Cuba

An action-research study within an Urban Agriculture project in Cuba identified challenges in integrating learning and change into the monitoring and evaluation (M&E) of development projects. The main challenge was that the project team did not recognize M&E as a learning tool, believing results could be used against their work. A lack of time for learning and knowledge sharing was another observed challenge. To address these, resistance was overcome through dialogue, reflection, and action, leading to team empowerment, and the role of an external facilitator proved key in steering the learning process.

Barbara Matthys, Andres B. Tschannen, Norbert T. Tian‐Bi, Hermann Comoé, Salia Diabaté, Mahamadou Traoré, Penelope Vounatsou, Giovanna Raso, Laura Gosoniu, Marcel Tanner, Guéladio Cissé, Eliézer K. N’Goran, Jürg Utzinger · Tropical Medicine & International Health · Côte d'Ivoire

A cross-sectional survey was conducted in urban farming communities in Man, western Côte d'Ivoire, involving 113 farming households (586 individuals) and 21 non-farming households (130 individuals). The prevalences of S. mansoni and hookworm in farming households were 51.4% and 24.7%, respectively. Risk factors for S. mansoni included close proximity to the Kô River, water contact with irrigation wells and ponds, and low education attainment, while risk factors for hookworm included living in smallholder irrigated rice plots or large rice perimeters, using domestic well water, and low socioeconomic status.

Craig J. Thompson, Gökçen Coskuner-Balli · Journal of Consumer Research · Global

This paper argues that the corporatization of the organic food movement, typically seen as co-optation, can instead generate a countervailing market response. This response actively promotes the oppositional aspects of a counterculture that are attenuated by commercial mainstreaming. The study analyzes community-supported agriculture (CSA) as an example of this response to corporate co-optation.

Viola Devasirvatham, P. S. Cornish · International Journal of Water · Australia

Peri-urban horticulture in Australia requires irrigation for year-round vegetable production. Subsurface Drip Irrigation (SDI) offers higher water use efficiency and crop yields, with the potential to reduce environmental risks from drainage and runoff. However, SDI has potential disadvantages, including poor germination or crop establishment and uneven wetting patterns. Research is needed to solve these problems and enable environmentally acceptable vegetable production.

Bernard Keraita, Flemming Konradsen, Pay Drechsel, Robert Clement Abaidoo · Tropical Medicine & International Health · Ghana

The effectiveness of low-cost irrigation methods (drip irrigation kits, furrow irrigation, and watering cans) in reducing contamination of lettuce irrigated with untreated wastewater in urban farming in Ghana was assessed. Analysis of 396 lettuce, 72 soil, 15 poultry manure, and 32 water samples revealed that lettuce irrigated with drip irrigation kits had the lowest contamination levels, with an average of 4 log units per 100g fewer thermotolerant coliforms than those irrigated with watering cans. However, drip kits often clogged, required lower crop densities, and restricted other routine farm activities.

F Ortega Sastriques, Rosa Orellana Gallego · Revista ciencias técnicas agropecuarias · Global

In many cities, the high price and limited availability of potable water necessitate considering irrigation with poor quality water, such as saline or alkaline waters, in urban agriculture. This paper considers aspects of irrigation with poor quality water, including risks like contamination.

F Ortega Sastriques, Rosa Orellana Gallego · Revista ciencias técnicas agropecuarias · Global

In many cities, potable water is expensive, and its availability is limited and will decrease in the future. Urban agriculture is an aspect to consider in this context.

F Ortega Sastriques, Rosa Orellana Gallego · · Global

Due to high prices and limited availability of drinking water in many cities, urban agriculture will require the use of alternative water sources. Groundwater and surface currents near cities are typically polluted, and this paper points out aspects to consider for safe irrigation using sewage water.

Stephanie Buechler, Gayathri Devi Mekala, B. Keraita · Victoria University Research Repository (Victoria University) · Global

This 2006 global study from Victoria University discusses wastewater use in urban and peri-urban agriculture for crop production and aquaculture, noting its role in generating livelihoods and providing cheap produce. However, the study emphasizes that clear policy guidelines and careful research are needed to prevent potential negative impacts on human health and the environment from wastewater reuse.