Research & reports

Rodrigue V.C. Diogo, Andreas Buerkert, Eva Schlecht · Nutrient Cycling in Agroecosystems · Niger (Niamey)

This 24-month study investigated nutrient efficiency and food safety in urban and peri-urban agriculture in Niamey, Niger. Nutrient inputs and offtakes were quantified for 10 vegetable gardens and 9 millet fields, and contamination of irrigation water and selected vegetables with fecal pathogens and heavy metals was determined. Above-threshold levels of Salmonella spp. and Escherichia coli were detected in lettuce irrigated with river water and fertilized with animal manure, and in lettuce irrigated with wastewater, indicating food safety concerns.

Crispen Dirwai, P.M. Makonese, N. Mboto · Figshare · Zimbabwe (Harare)

This study investigated how urban poor (Mabvuku-Tafara) and urban rich (Mabelreign, Marlborough, Westgate) communities in Harare, Zimbabwe, addressed the food crisis between 2005 and 2008. Using a mainly qualitative methodology to compare urban agricultural activities, findings showed that the urban poor engaged in seasonal, often inorganic, less paying off-yard farming, exposed to nature's vagaries. In contrast, the urban rich practiced on-plot perennial, often organic, researched (including soil testing) farming with greenhouses, which yielded better returns.

Lorenzo Montero San José, Reinaldo Cun García, Jeny Pérez Petitón, Martha Paula Ricardo Calzadilla, Julián Herrera Puebla · DOAJ (DOAJ: Directory of Open Access Journals) · Cuba (Ciudad de La Habana)

This study, conducted at the "Camilo Cienfuegos" urban farm in San Miguel del Padrón, Havana, Cuba, investigated the effect of wastewater irrigation on sorghum and maize yields for animal feed. Applying a total net dose of 1775.4 m3·ha-1 of wastewater over 31 irrigations significantly increased grain yields to 4.29 t·ha-1 for sorghum and 1.73 t·ha-1 for maize, compared to rainfed conditions.

Martina Předotová, Eva Schlecht, Andreas Buerkert · Nutrient Cycling in Agroecosystems · Niger (Niamey)

An experiment quantified nitrogen and carbon losses from animal manure stored in urban vegetable gardens in Niamey, Niger. During a 3.5-month dry season experiment, cumulative gaseous nitrogen losses were highest (0.11 g kg−1 manure DM) in the uncovered control, decreasing by 72% with plastic sheet roofing and 50% with roofing plus rock phosphate. In a second 3.5-month rainy season experiment, carbon losses from the control were 164 g kg−1 manure DM, reduced to 77% and 65% of the control by roofing and roofing plus rock phosphate, respectively. Leaching losses during the rainy season were only observed for the unroofed control.

Ana Puertas, L Hidalgo-Díaz · Revista de Protección Vegetal · Cuba

An experiment in Cuba investigated the effect of different organic fertilizers on the establishment of the biological control agent Pochonia chlamydosporia var. catenulata in the substrate and rhizosphere of tomato plants. High colonization levels of the substrate and tomato roots were observed across all treatments using soil, cattle manure, and worm humus in various proportions. Results indicated a tendency for higher root colonization values in organic fertilizers and proportions that allowed medium or lower substrate colonization. Both organic fertilizers can be used to support the application of P. chlamydosporia var. catenulata in urban agriculture.

Joël Sotamenou · · Cameroon (Yaounde)

This paper identifies determinants of domestic waste recycling and use in three swamp areas of Yaounde, Cameroon, based on data collected from 126 farmers between August and September 2005. Findings indicate that vegetable production, short farm-to-home distance, use of recycled livestock waste, education level, and farm surface positively influence the decision to use domestic waste. Conversely, farmer age has a negative effect.

Delia Nicoleta Vieru · · Global

This text discusses organic waste reduction, noting that over 50% of household waste is organic and often leads to pollution. It explains the importance of managing compost processes for quality compost, emphasizing a 30:1 carbon to nitrogen ratio for efficient decomposition. The text proposes school-based compost production as a method to engage the school community in environmental efforts, promoting resource recirculation, education on compost benefits, waste attitude change, reduction of school canteen waste, student involvement, and the creation of fertile soil for school gardens.

Delia Nicoleta Vieru, Narcis Paul Vieru · DOAJ (DOAJ: Directory of Open Access Journals) · Global

This descriptive article on composting states that about half of household waste consists of food remains, vegetable, and garden waste, and that over 50% of waste is organic material that ends up in storage sites, cesspools, or is burned, causing significant pollution. As an alternative, it describes transforming organic material through microbial, biochemical, chemical and physical processes into a humus-like material called compost. Producing quality compost requires managing the pile's dimensions, humidity, structure, and composition so decomposition agents (bacteria, fungi, mites, springtails, woodlice, worms, millipedes) have an ideal, nutrient-rich substrate; these agents need nitrogen ("green" elements, from food remains, cut grass, and green leaves) alongside carbon ("brown" elements, from wood chips, dry leaves, and sawdust), maintained at roughly a 30:1 brown-to-green ratio through alternating layers. The article states that producing compost in schools can bring the whole school community together for environmental work, contributing to natural resource recirculation, community education about compost's benefits, a shift in cultural attitudes toward waste, reduced food-remainder volume from school canteens, student involvement in extracurricular activities, and fertile soil for school gardens and planting. The abstract text is truncated at the end, cutting off its description of composting's benefits as a fertilizer.

G. Palaniappan, Christine King · Queensland's institutional digital repository (The University of Queensland) · Australia

A conceptual paper framing local food production systems—termed "alternative farming"—against a backdrop of global environmental changes (retreating sea ice, landscape drying, shifts in seasonal timing and animal migration) and climate-driven increases in energy prices and dependence on fossil fuels, which the authors say have raised interest in localization and sustainability among communities worldwide. It examines systems including organics, natural farming, biodynamics, permaculture, community gardens, and community-supported agriculture (CSA) in terms of how they might contribute to localizing food production and consumption, and discusses the transition from globalized to localized farming and re-localization's ecological and social dimensions. The paper argues that sustainability can be grounded in local ecological, social, economic, and political systems, but the discussion is conceptual rather than based on presented empirical data.

C. T. de T. Machado, A. T. Machado · · Global

This review compiles ecological principles for urban agriculture—crop diversity, organic and mineral-based fertilizers, and non-toxic pest and disease management—and describes international examples such as diversified plots in Austria and the "organoponico" system in Cuba. It surveys Brazilian experiences from pioneering ecological urban agriculture in Belo Horizonte, Minas Gerais, to later programs in Campinas (São Paulo) and Natal (Rio Grande do Norte), as well as initiatives in Rio de Janeiro, the São Paulo municipal urban agriculture program, and Brasília, presenting the rationale, alternatives, and constraints of ecologically based crop management in urban agriculture.

Consuelo Montes Rojas, Víctor Felipe Terán Gómez, Diego Fernando Ortiz Tovar · DOAJ (DOAJ: Directory of Open Access Journals) · Colombia (Popayán)

This research aimed to design a hydro-organic system for vegetable production in small areas to contribute to urban food security and solid waste utilization in Popayán, Colombia. An alternative system was designed using recycled materials and evaluated with three nutritional treatments using cilantro as a biological indicator. The system achieved productions of up to 627 g m-2, surpassing traditional agriculture (227 g), and the common nutritional solution was identified as the best nutritional source.

Stephan Barthel, Carl Folke, Johan Colding · · Sweden (Stockholm)

This thesis investigated how social-ecological features influence ecosystem service (ES) generation through case studies in Stockholm, Sweden. Findings indicated that urban ES flows are products of co-evolutionary processes, requiring governance to consider historical rights and diverse actor groups. Informally managed allotment gardens showed higher pollinator abundance compared to other urban green spaces, and social-ecological memory among gardeners was found to retain and transmit practices linked to ES generation. The study concluded that sustaining urban ES depends on management practices by people and local communities of ecosystem practice.

María Amalia Lorda, Jezabel Franza, María Belén Kraser, Daniel Paoloni, Silvina Raitzin, Gabriel Oscar Reiter · Revista de Lengua y Literatura (National University of Comahue) · Argentina (Bahia Blanca)

This communication provides the foundations for implementing "Park-Gardens" in Bahia Blanca, Argentina, to recover urban and peri-urban spaces. Park-Gardens are described as multifunctional public spaces, participatively managed by the state and civil society using ecological cultivation techniques. They contribute to local development, strategic planning, improved sanitary conditions, strengthened biodiversity, and sustainable resource management, while enabling agrochemical-free food production.

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.

Rui Chen · Chinese Agricultural Mechanization · Global

Urban agriculture is based on a combination of manufacture, life, and ecology, emphasizing urban and rural development in step, and the co-prosperity of economy, ecology, and society. This study adopted the analytic network process (ANP) to construct an evaluation index system of urban agriculture, based on domestic and international research. Theoretical foundations of ANP were discussed, and dependence and feedback among indexes were analyzed. The result of the ANP model for the index system was obtained with SD software.

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.

Consuelo Montes Rojas, Víctor Felipe Terán Gómez, Diego Fernando Ortiz Tovar · DOAJ (DOAJ: Directory of Open Access Journals) · Colombia

This research aimed to design a hydro-organic vegetable production system for small areas in Popayán, Colombia, utilizing recycled materials and urban solid waste. The system was evaluated using three nutritional treatments (organic leachate, supplemented organic leachate, common nutrient solution) with cilantro as a biological indicator. The urban vegetable production system achieved yields of up to 627 g m-2, surpassing traditional agriculture (227 g), with the commercial nutrient solution identified as the best nutritional source.

Graciela Arosemena Díaz · Dialnet (Universidad de la Rioja) · Global

This thesis proposes a methodology for introducing urban agriculture into urban planning to achieve urban sustainability by closing nutrient cycles. It aims to integrate urban and agrarian systems by balancing urban waste production with vegetable needs and cultivated space output with nutrient restitution. The research develops formulas to define criteria for urban agriculture introduction, including required cultivated area and organic waste reuse, and analyzes historical and contemporary green systems in relation to agriculture.

Luis L. Vázquez Moreno, Emilio Fernández Gonzálvez · · Cuba

A participatory research study conducted in 2003–2005 across municipalities and representative production systems of Havana's urban and peri-urban agriculture — where synthetic pesticides are prohibited in "organopónico" and other orchard systems — characterized farmers' pest management practices. Farmers were found to have adopted agroecological innovations including managing floristic diversity, crop rotations and associations, corn and other plant barriers, repellent plants, peripheral live fences, natural-enemy reservoirs, biopesticide applications, and botanical preparations.

Erisman, Jan Willem, Sutton, Mark A., Galloway, James, Klimont, Zbigniew, Winiwarter, Wilfried · Nature Geoscience · Global

On 13 October 1908, Fritz Haber filed his patent on the synthesis of ammonia from its elements, for which he was later awarded the 1918 Nobel Prize in Chemistry. This Nature Geoscience piece examines how, a century on, the world has been transformed by and become highly dependent on Haber-Bosch nitrogen.

Jayakody P., Gunawardana I., Guneratne S., Clemett A., Dissanayake P. · IWMI Research Reports (WASPA Asia Project Report 8), International Water Management Institute · Sri Lanka (Kurunegala)

This IWMI report documents peri-urban paddy cultivation using diverted municipal wastewater around Kurunegala city, highlighting the practice as representative of urbanization impacts on Sri Lankan agriculture while identifying significant public health risks from untreated effluent irrigation.

Virginia Hamdan, Paula Natinzon · REVISTA BRASILEIRA DE AGROECOLOGIA · Argentina

This study quantified the organizational sustainability of 41 agroecological urban gardens within the UNMdP Food Autoproduction Program in Argentina. It developed a Socio-Organizational Sustainability Index (ISO) based on Group Potential, Capacity of Automanagement, and Organizational Practices. Most gardens showed a "Middle" degree of ISO, primarily due to Capacity of Automanagement and Organizational Practices.

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.

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.

Mark Anderson-Wilk · Journal of Soil and Water Conservation · Global

This abstract discusses the concept of Community-Supported Agriculture (CSA), pioneered in Japan and Europe in the 1960s and introduced to the US in the mid-1980s. CSAs are described as a model where individuals become farm members, sharing the risks and benefits of food production and receiving shares of local produce. The abstract introduces the question of whether CSAs support natural resource conservation but does not present any specific findings or conclusions regarding this question.