Research & reports
Peer-reviewed research and reports on community urban agriculture, food education, composting, welfare and more.
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Critical findings
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Resistensi Azotobacter terhadap HgCl2 yang Berpotensi Menghasilkan Enzim Merkuri Reduktase
2014Anjar Lulu Sakinah, Enny Zulaika · Jurnal Sains dan Seni ITS · Indonesia
This study aimed to isolate Azotobacter strains from the Eco Urban Farming ITS land in Indonesia that are resistant to HgCl2 and potentially produce mercury reductase enzymes. Ten HgCl2-resistant Azotobacter isolates were obtained, with isolates A5, A6, and A9 showing the highest resistance at 20 mg/L HgCl2. Isolates A5 and A9 were identified as having the potential to produce mercury reductase enzymes.
Contamination & food safetyOrganic cycleUrban Gardening: Managing the Risks of Contaminated Soil
2013Rebecca Kessler · Environmental Health Perspectives · Global
As interest in urban agriculture grows, researchers are working to manage the risks of contaminated urban soils. The focus is on maximizing the benefits of urban gardening while minimizing the potential hazards associated with soil contamination.
Contamination & food safetyHealthEnvironmental Challenges Threatening the Growth of Urban Agriculture in the United States
2013Sam E. Wortman, Sarah Taylor Lovell · Journal of Environmental Quality · United States
This review paper characterized the limited state of scientific knowledge regarding abiotic environmental factors threatening the growth of urban agriculture in the United States. It identified challenges influencing urban cropping systems, including soil contamination and remediation, atmospheric pollutants and altered climatic conditions, and water management, sources, and safety. The development of a science-based approach in these areas is noted as essential for the economic and environmental sustainability of urban agriculture.
Contamination & food safetyClimate changeEconomicsCommunityFood educationWhat are the impacts of urban agriculture programs on food security and nutrition in low and middle income countries
2013Robert Garey Stewart, Marcel Korth, Laurenz Langer, Shannon Rafferty, N Rebelo Da Silva · · Global
This paper is a protocol for a systematic review on the impacts of urban agriculture programs on food security and nutrition in low and middle-income countries. It notes potential disadvantages of urban agriculture, including contamination, spread of diseases, depletion of water supplies, soil erosion, and health risks from pesticides. The review aims to identify, appraise, and synthesize evidence on these impacts comprehensively and transparently, given that the existing evidence-base is not well understood.
Contamination & food safetyFood sovereignty & justiceHealthClimate changeEconomicsNIVELES DE CADMIO, PLOMO, COBRE Y ZINC EN HORTALIZAS CULTIVADAS EN UNA ZONA ALTAMENTE URBANIZADA DE LA CIUDAD DE LA HABANA, CUBA
2013Susana Olivares Reumont, Damarys García Céspedes, Lázaro Lima Cazorla, Israel Saborit Sánchez, Axel Llizo Casals, Pedro Pérez Álvarez · Revista Internacional de Contaminación Ambiental · Cuba (Havana)
This study investigated levels of Cu, Pb, Cd, and Zn in soils and vegetables from 17 urban agriculture farms around the "Calle 100" landfill in Havana, Cuba, during 2006-2007. Findings showed that 35% of soils exceeded typical Cuban agricultural ranges for Zn, and 52% for Pb. Critically, 23% of soils surpassed phytotoxic and international limit levels for Pb, and 12.5% of vegetable samples exceeded Cuban maximum permissible limits for Pb in food for human consumption. The results indicate a need for strict monitoring of horticultural crops in the area due to contamination.
Contamination & food safetyHealthUrban–rural linkagePolicyTelling Consumers, Gardeners, and Farmers about the Possible Risk of Rat Lungworm in the Local Food Supply in Hawai‘i
2013James R. Hollyer · PubMed Central · United States
This article discusses the potential risk of rat lungworm (Angiostrongylus cantonensis) in Hawai‘i's local food supply, which can cause eosinophilic meningitis if ingested by humans. While the statistical risk is extremely low compared to other foodborne agents, two individuals in Hawai‘i developed serious eosinophilic meningitis in late 2008 after consuming insufficiently washed local produce. The article highlights the challenge of informing the public about this rare but potentially serious disease, especially amidst efforts to promote local produce and school gardens.
Contamination & food safetyHealthFood educationHeavy Metal Tolerance of Fungus Isolated from Soil Contaminated with Sewage and Industrial Wastewater
2013Shazia Iram, Ayesha Zaman, Zaiba Iqbal, Rabia Shabbir · Polish Journal of Environmental Studies · Global
This study screened soil samples from peri-urban agricultural areas to investigate heavy metal contamination and identify heavy metal-tolerant fungi. Results showed that the majority of isolated fungi were resistant to lead (Pb) and chromium (Cr). Among the strains, Aspergillus niger was the most tolerant to Pb with an MIC of 600 mg/l, and Aspergillus flavus was the most tolerant to Cr with an MIC of 400 mg/l.
Contamination & food safetyPeri-urban agricultureHealthBioaccessibility of heavy metals and risk assessment in urban gardens of Madrid
2013Marcelo Ortega Romero, Juan Mingot Marcilla, María Jesús García Martínez, Eduardo de Miguel, Miguel Izquierdo‐Díaz, Amaya Gómez · · Spain (Madrid)
This study evaluated the potential health risk from trace elements in urban garden soils in Madrid, Spain. Thirty-six composite soil samples were collected from the top 20 cm of six urban gardens, and concentrations of cobalt, chromium, copper, nickel, lead, and zinc were determined. The findings indicated that urban soils are significantly enriched in trace elements relative to background levels, suggesting a potential health risk.
Contamination & food safetyHealthCommunityFood sovereignty & justicePollution as a threat factor to urban food security in metropolitan Kano, Nigeria
2013Mansur 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.
Contamination & food safetyHealthFood sovereignty & justiceUtilisation de l'eau de pluie dans les jardins collectifs en France : enjeux, problématiques et premières analyses des pratiques Rainwater harvesting and use in community gardens in France: issues, risks and first practices analysis
2013Mucig Charlotte · · France
A survey on rainwater harvesting in community gardens in France indicates that while this practice has been ongoing for years, it is poorly documented and faces challenges in adapting to new French regulations. The findings highlight public health issues for both garden users and consumers of fruits and vegetables, as well as environmental and operational concerns.
Contamination & food safetyCommunityHealthPollution of Water, Soil and Vegetables: Challenges to Growing Cities of Bahir Dar and Kombolcha, Amhara Region, Ethiopia
2013Mekonnen 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.
Contamination & food safetyHealthUrban–rural linkageCHARACTERIZATION OF HEAVY METALS ATMOSPHERIC DEPOSITION FOR ASSESSMENT OF URBAN ENVIRONMENTAL QUALITY IN THE BOLOGNA CITY (ITALY)
2013Vittori Antisari, Livia; Dipartimento Di Scienze E Tecnologie Agroambientali, University Of Bologna, Bologna, Serena Carbone, Ferronato, Chiara; Dipartimento Di Scienze E Tecnologie Agroambientali, University Of Bologna, Bologna, Simoni, Andrea; Dipartimento Di Scienze E Tecnologie Agroambientali, University Of Bologna, Bologna, Vianello, Gilmo; Dipartimento Di Scienze E Tecnologie Agroambientali, University Of Bologna, Bologna · Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) · Italy (Bologna)
Concentrations of heavy metals (Ba, Cd, Co, Cr, Cu, Ni, Pb, V, Zn) were determined in topsoil, plants, and moss tissues in the suburban area of Bologna, Italy, due to an urban waste incinerator and other atmospheric emission sources. No correlation was found between metal content and the incinerator plant's distance. The pollution load index (PLI) for soil and moss indicated low environmental pollution, but the highest values in sites downwind of the incinerator and in a craft area indicated moderate pollution.
Contamination & food safetyHealthBiodiversityHeavy metals concentrations in selected areas used for urban agriculture in Dar es Salaam, Tanzania
2013Kibassa, Kimaro, Shemdoe · Scientific Research and Essays · Tanzania (Dar es Salaam)
A study assessing heavy metal concentrations in soils from selected urban agriculture areas in Dar es Salaam, Tanzania, found that zinc, chromium, cadmium, lead, and copper levels in all six investigated sites were within the Tanzania Bureau of Standards permissible limits. The highest values for copper, zinc, and lead were observed in Tazara Mchichani, potentially indicating pollution from surrounding manufacturing industries. Flooding did not appear to influence the distribution of these heavy metals.
Contamination & food safetyHealthUrban and peri-urban agricultural production along railway tracks: a case study from the Mumbai Metropolitan Region
2013Prem José Vazhacharickal, Martina Předotová, D. Chandrasekharam, Sharit K. Bhowmik, Buerkert, Andreas · Journal of Agriculture and Rural Development in the Tropics and Subtropics (University of Kassel) · India (Mumbai)
A study surveyed 38 railway gardeners to characterize urban and peri-urban agricultural production along railway tracks in the Mumbai Metropolitan Region. Irrigation water contained nutrients but also heavy metals such as lead, cadmium, and mercury, and pathogens like Escherichia coli. Heavy metal levels exceeded critical thresholds in surface soils for chromium, nickel, and strontium, and in produce for lead, cadmium, and strontium.
Contamination & food safetyCommunityFood sovereignty & justiceHealthGroundwater Vulnerability to Contaminated Irrigation Waters - A Case of Peri-Urban Agricultural Lands Around an Industrial District of Haryana, India
2013K.G. Rosin, Ravinder Kaur, Sushma Singh, Prabhat Kumar Singh, Digvijay Dubey · Procedia Environmental Sciences · India
A study was conducted in peri-urban agricultural sites around Faridabad, Haryana, India, to assess groundwater contamination and the contribution of salt/trace metal-laden irrigation waters. Mean EC, Cl, and F concentrations in root zone leachates were found to be far beyond permissible limits, and some trace metals posed a threat to deep percolating waters. However, due to existing cropping patterns and deeper water table depths, the groundwaters were not yet vulnerable to these salts/trace metals, and the presence of salts in the groundwaters was primarily geogenic.
Contamination & food safetyPeri-urban agricultureHealthThe Influence of Lead Hyperaccumulators on the Uptake of Lead by Vegetables
2013Laura Knapp, Jodi L. Sangster, Shannon L. Bartelt‐Hunt · International Journal for Service Learning in Engineering Humanitarian Engineering and Social Entrepreneurship · United States (Omaha NE)
This study investigated the influence of lead hyperaccumulating plants on lead uptake by vegetables in an urban community garden in Omaha, NE, a region with significant lead contamination. Tomatoes, carrots, and amaranth were grown alongside sunflowers and mustard greens (hyperaccumulators) in lead-contaminated soil. Data showed higher lead concentrations in the hyperaccumulators and suggested that their presence might have impacted the amount of lead available to surrounding vegetation. Previous work at the garden detected lead in produce, indicating a potential exposure pathway for humans.
Contamination & food safetyHealthCommunityField assessment of cadmium, lead and zinc contamination of soils and leaf vegetables under urban and peri-urban agriculture in northern Nigeria
2012G. N. Egwu, John O. Agbenin · Archives of Agronomy and Soil Science · Nigeria
A study in northern Nigeria assessed cadmium, lead, and zinc contamination in soils and leaf vegetables (amaranthus, lettuce) irrigated with untreated wastewater. Total cadmium and zinc concentrations in soils exceeded safe limits, and lead and cadmium in edible portions of amaranthus and lettuce exceeded safe limits for human consumption by 7–17 times. The permissible limit for lead established for agricultural lands may not be suitable to ensure produce safety in urban and peri-urban agriculture in Kano.
Contamination & food safetyHealthPeri-urban agriculturePhytodiversity for Metals in Plants Grown in Urban Agricultural Lands Irrigated with Untreated City Effluent
2012Ghulam Murtaza, Abdul Ghafoor, Muhammad Zia‐ur‐Rehman, Muḥammad Ṣābir, Asif Naeem · Communications in Soil Science and Plant Analysis · Global
This study investigated metal accumulation in plants grown in urban agricultural lands irrigated with untreated city effluent in developing countries. Sewage samples showed hazardous electrical conductivities, sodium adsorption ratios, and residual sodium carbonate for irrigation, although metal levels were near permissible limits. Critically, plants acquired metal contents that were greater than those found in the raw sewage or soils, indicating significant metal uptake.
Contamination & food safetyHealthStrucutural, Chemical and Bacteriological Characterization of the Rhizosphere of Zea Mays Grown in Metal-Contaminated Soil
2012Nahed N. Mahrous · The Journal of Pediatrics · Canada (Hamilton)
This project investigated metal, bacteria, and corn root interactions in metal-contaminated soils from Blackfrairs Community Garden and a Hamilton home. It found that bacterial numbers were lower than in uncontaminated soils, and bioavailable metal concentrations increased over time. High concentrations of metals were detected in grains, with copper, iron, and manganese accumulating in rhizospheres, and zinc distributed throughout root tissue in Blackfrairs plants.
Contamination & food safetyHealthCommunityHEAVY METAL POLLUTION AND URBAN AGRICULTURE IN MSIMBAZI RIVERVALLEY: HEALTH RISK AND PUBLIC AWARENESS
2012Lori Leonard, W. J. S. Mwegoha, Charles Kihampa · International Journal of Plant Animal and Environmental Sciences · Tanzania (Dar es Salaam)
This study investigated public awareness and health risks from heavy metal pollution in vegetables irrigated with Msimbazi River water in Dar es Salaam, Tanzania. Over 71% of 35 respondents used the river for irrigation, and high levels of chromium, lead, and copper were detected in popular vegetables. 69% of respondents were unaware of industrial pollution, and 63% were unaware of potential health effects. The study found that 95.6% of adults, 30.7% of children aged 6-12, and 12.5% of children aged 2-6 were at risk of lead carcinogenic effects, while 5% of children aged 2-6, 2.8% of children aged 6-12, and 1.2% of adults were at risk from carcinogenic cadmium effects.
Contamination & food safetyHealthCommunityImpact of urban gardening in equatorial zone on soils and metal transfer to vegetables
2012Aubin Ondo, Pascale Prudent, C. Massiani, Menye Biyogo, Mariane Domeizel, Jacques Rabier, François Eba · Journal of the Serbian Chemical Society · Gabon (Libreville)
An assessment of urban agriculture's impact on soil properties and metal uptake by leafy vegetables in Libreville, Gabon, found strong soil acidification and decreased nutrient/metal concentrations due to agricultural practices. Metal transfer to plants was significant, with amaranth accumulating more metals than other vegetables, though cadmium and lead were not detectable in plant tissues. Amaranth and roselle preferentially concentrated metals in their leaves.
Contamination & food safetyOrganic cycleHealthCommunityPreliminary results of studies on radioisotopes activity concentrations in vicinity of cement works
2012Zbigniew Ziembik, Agnieszka Dołhańczuk-Śródka, Grzegorz Kusza · Proceedings of ECOpole · Poland
Soil samples were collected from the former "Piast" cement plant within Opole city borders, Poland, and nearby allotment gardens to study radioisotope activity concentrations. Naturally occurring radioisotopes and artificial Cs were found, with K and Cs showing the biggest radioactivity concentration. No significant differences in radionuclide activities were found between soil samples from the former industrial estate and the allotment gardens.
Contamination & food safetyHealthCommunityJapanese Encephalitis Virus in Pigs and Vectors in the Mekong Delta With Special Reference to Urban Farming
2012Johanna F. Lindahl · · Vietnam
The circulation of Japanese encephalitis virus (JEV) in pigs and mosquitoes was investigated around Can Tho city in Vietnam's Mekong Delta. Of 315 sows, 60% were JEV seropositive, and seropositivity was associated with more stillborn piglets in sows under 1.5 years old. Among 7885 mosquitoes collected in and around Can Tho city, seven pools collected near pigs tested positive for JEV, indicating co-circulation of JEV genotypes I and III. All 43 pigs sampled within Can Tho city were JEV seropositive, demonstrating that JEV can be a public health issue in urban areas.
Contamination & food safetyHealthUrban–rural linkageTRADITIONAL FARMING PRACTICES AND WASTEWATER IRRIGATION FARMING IN PERIURBAN, ZAMBIA
2012Evaristo Mwaba Kapungwe · Indonesian Journal of Biotechnology (Universitas Gadjah Mada) · Zambia
This study investigated farming practices related to heavy metal contaminated wastewater irrigated farming in two peri-urban areas of Zambia: New Farm in Mufulira and Chilumba Gardens in Kafue. Data was collected by observing crop cultivation activities at field plots along transects in stratified land zones. The results revealed that farming practices were characterized by traditional land management and multiple cropping systems, influenced by agro-ecological factors and the availability of heavy metal contaminated wastewater, which has the potential to contaminate soils and crops.
Contamination & food safetyPeri-urban agricultureOrganic cycleHealthTHE OCCURRENCE OF LEAD IN SOIL AND VEGETABLES AT A COMMUNITY GARDEN IN OMAHA, NEBRASKA
2012Jodi L. Sangster, Andrew Nelson, Shannon L. Bartelt‐Hunt · International Journal for Service Learning in Engineering Humanitarian Engineering and Social Entrepreneurship · United States (Omaha)
Soil and vegetable samples were collected from a community garden in Omaha, Nebraska, which had known soil lead contamination. Total lead content was evaluated using atomic absorption spectroscopy, revealing lead concentrations in soil ranging from 4 to 574 ppm, with an average of 128.4 ppm in growing beds and 31.5 ppm in OmaGro compost. Lead was also present in vegetable samples at or below 16.25 ppm.
Contamination & food safetyCommunityHealth