Research & reports

Anders Sybrandt Hansen · Journal of Current Chinese Affairs · China

This article focuses on organic farming, which has grown in response to unsafe food on the Chinese market, based on ethnographic fieldwork at one such farm in northern China. While the farm's Community Supported Agriculture model relies on establishing personal trust with member households, the entire organic farming project is shown to be undergirded by strong expressions of solidarity with conventional farmers. The article proposes an extended concept of moral economies to capture the coexistence of differential care alongside horizontal solidarities within contemporary China's moral landscape.

Maira dos Santos, Mariana Campos Martins Machado · Segurança Alimentar e Nutricional · Brazil (Florianópolis)

A qualitative study was conducted with 11 participating families of a community garden in the Campeche neighborhood of Florianópolis, Brazil, to evaluate the impact of Urban and Peri-urban Agriculture (AUP) on Food and Nutritional Security (SAN) and eating behavior. Through interviews using semi-structured questionnaires, the community garden was understood as a space for health promotion, strengthening healthy eating practices, and preserving the municipality's food culture. The community garden proved effective in promoting and guaranteeing SAN principles, strengthening healthy eating practices, and fostering citizenship.

Gaston E. Small, Sara Osborne, Paliza Shrestha, Adam D. Kay · International Journal of Environmental Research and Public Health ·

This study measured phosphorus (P) concentrations in native soil below four- and six-year-old urban garden plots, collecting soil cores from five plots of each age. It found that inorganic weakly exchangeable P was significantly elevated in native soil below garden plots (>35 cm deep) compared to reference profiles, indicating accumulation of excess P from compost. This suggests that while urban agriculture can recycle P, over-application of compost may contribute to soil and water pollution.

Silvia Iveth Moreno Gaytán, Mercedes A. Jiménez-Velázquez, Martín Hernández Juárez · Estudios Sociales Revista de Alimentación Contemporánea y Desarrollo Regional · Mexico (Ciudad de México)

The sustainability of urban agriculture practiced by women in the Valle de Chalco Solidaridad, Mexico City Metropolitan Area, was investigated. A qualitative follow-up on 45 production units and a quantitative questionnaire to 25 female producers from Xico Kaa’a Comunicaciones A. C. were conducted. Urban agriculture's sustainability was found to be strong, contributing to family food self-sufficiency, employing agroecological techniques for environmental improvement, and over 50% of MESMIS diagnostic criteria were evaluated as sustainable.

L.C. Obuseng · Botswana Journal of Agriculture and Applied Sciences · Botswana (Gaborone)

This review highlights the potential for heavy metal accumulation in soil and crops from urban and peri-urban agriculture (UPA) around Gaborone, Botswana, due to the intensive use of chemical fertilizers, pesticides, wastewater, sludges, and industrial effluents. A literature review showed that fertilizers contain heavy metals, and the use of treated or untreated sewage water by UPA farmers can lead to heavy metal accumulation in soil and crops, posing a danger to human health. Information on heavy metal accumulation in soils is limited in Botswana, despite high agrochemical use in UPA vegetable production.

Wendy Johanna Murcia Gulumá, Óscar Andrés Pérez Soler, Sindy Rodríguez Rodríguez · · Colombia (Bogotá)

This study provided advisory support to an urban garden in Bogotá, Colombia, named "Guerreros y Guerreras Unidos en Accion," which had been operating empirically since 2005 without formal legal status or strategic planning. The garden, primarily involving individuals over 50 without formal employment, sought to formalize its activities by establishing a foundation. The intervention aimed to guide the garden's members through the legal and administrative steps for formalization.

Theresa Brehm · Iowa State University Digital Repository (Iowa State University) · Uganda

This study, conducted at Naluwoli Primary School garden in Kamuli district, Uganda, tested the decomposition of household items as an inexpensive indicator of soil health. Cotton underwear, green and rooibos teas, and birch wood sticks were buried for 4, 7, 14, and 21 days in hand-tilled and untilled soils. Untilled soils decomposed cotton by 0.68% less and birch wood sticks by 0.86% more per day than hand-tilled soils, while tea data was inconclusive due to outside biological factors.

Francesca Cappellaro, Laura Cutaia, Carolina Innella, Claudia Meloni, R. Pentassuglia, Vincenzo Porretto · Environmental Engineering and Management Journal · Italy (Rome)

This paper presented several circular economy practices integrating circular strategies at an urban scale, focusing on the Centocelle district in Rome, Italy. Through the employment of smart solutions and a collaborative process involving citizens, circular economy urban practices such as community gardens, co-workings, local and km0 production systems, and recycling centers were identified. These practices achieved urban transformation in terms of regeneration, sharing economy experiences, resource optimization, and closed-loop systems, positively and actively influencing the urban community in supporting the transition towards circular economy models.

Gaston E. Small, Paliza Shrestha, Geneviève S. Metson, Katherine Polsky, Ivan Jimenez, Adam D. Kay · Environmental Research Communications · United States

Survey data from 142 gardeners and urban farmers in the Twin Cities Metropolitan Area, USA, characterized phosphorus (P) and nitrogen (N) inputs and harvest, and measured soil P concentrations at a subset of sites. Median application rates were 300 kg P/ha and 1400 kg N/ha, with low nutrient use efficiencies (2.5% for P, 5.0% for N). Garden soils had a median Bray P value of 80 ppm, far exceeding recommended levels, indicating a buildup and potential loss of P and N. Urban gardens, though only 0.1% of land area, constitute one of the largest inputs of P to the watershed.

Rafael Bújanos Muñíz · · Global

This essay explores the intersection of permaculture principles and their potential application in urban agriculture. Permaculture, originating from the work of Bill Mollison, David Holmgren, and Masanobu Fukuoka in the 1970s, is a system for designing and implementing general principles for organic food production in urban settings. It is based on natural ecosystem patterns and ethical principles, including soil, forest, and water conservation, self-care, and equitable distribution of goods with reasonable consumption limits.

Sally Brown, Ned Beecher · Compost Science & Utilization · United States

This study modeled the carbon benefits and costs of biosolids compost use in King County, Washington. Soil carbon sequestration was highest for use on disturbed soils, such as new housing developments, neglected urban soils, or highway right-of-ways (–1.1 Mg CO2eq per Mg compost), and lowest for use in well-tended yards or other highly maintained landscapes (–0.036 Mg CO2eq per Mg compost). Compost use for tree growth, calculated over a 30-year period, added above-ground sequestration benefits ranging from –1.53 Mg CO2eq per Mg compost for a mature tree grown on a healthy soil to –4.58 Mg CO2eq per Mg compost for a newly planted tree grown on a disturbed site. Assuming a 20 km haul distance, transport costs ranged from 0.005 Mg CO2eq per Mg compost for delivery in a 5 Mg truck to 0.09 Mg CO2eq per Mg compost for pick up in a personal vehicle.

Surendra K. Pradhan, Olufunke Cofie, Josiane Nikiema, Helvi Heinonen‐Tanski · Sustainability · Global

This research determined the fertilizer value of sawdust and fecal sludge (SDFS) pellets and compared their effect on lettuce cultivation with other fertilizers in a greenhouse and open field. SDFS pellets, with or without enrichments, resulted in higher saleable fresh weight lettuce yields than commercial compost, poultry manure, mineral fertilizer, or no fertilizer. Open field cultivation yielded more than greenhouse cultivation. While no helminth eggs were detected, some fecal coliforms were found in lettuces fertilized with almost all tested fertilizers, including NPK and the non-fertilized control.

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.

Pedro López Labarta, José Luis Montejo Viamontes, Yacelis Cárdenas García, Dimeri Piñeiro Esquivel, Diosmaris de la Caridad Vasallo Cristia, Amaury Rondón Aquilar · DOAJ (DOAJ: Directory of Open Access Journals) · Cuba

This research, conducted in the Ernesto Che Guevara intensive orchard in Esmeralda municipality, Cuba, from December 2016 to March 2017, compared different bioorganic nutrition alternatives and their influence on growth and yield indicators in carrot cultivation. Using a completely randomized experimental design with five treatments and three repetitions, plant height, root length, and yield were evaluated. Fortified liquid humus and liquid humus enriched with boron, calcium, and zinc yielded the best agronomic indicators and the greatest economic benefits compared to natural liquid humus and the control.

N.S. Al-Ghumaiz · International Journal of Design & Nature and Ecodynamics · Saudi Arabia

This study assessed agronomic characteristics of eight bread wheat genotypes grown organically on low fertility soil in Saudi Arabia's arid Qassim region during the 2010 and 2011 growing seasons. Experiments compared conventional and organic farming systems at two locations, measuring chlorophyll content, flag leaf area, and harvest index. Findings showed differences between farming systems, with specific genotypes like YR and E-line identified as potentially suitable for sustainable organic wheat production in arid regions.

Ignacio Laorga Fernández · · Global

This study analyzed the "risk reduction" effect of organic amendments from urban and agricultural waste (coffee grounds, domestic compost, livestock manure) on metal-contaminated soils. The method aimed to reduce the bioavailability of metals by increasing soil organic matter, enabling remediation for potential reuse as urban gardens. It was shown that immediate dilution and immobilization of contaminants occur, significantly reducing their mobility and absorption by edible plants.

Michael Martin, Sofia Poulikidou, Elvira Molin · Sustainability · Global

This study used life cycle assessment (LCA) to evaluate the environmental performance of using urban residual material flows in vertical hydroponic farming. It assessed replacing conventional growing media with paper, compost, and brewers’ spent grains, and conventional fertilizers with biogas digestate. The results indicate significant environmental performance benefits when conventional growing media are replaced, and substantial potential benefits, though less significant, when fertilizers from residual urban streams are used, suggesting potential for more circular hydroponic systems.

Alma E. Nacua · Modern Concepts & Developments in Agronomy · Philippines (Manila)

This paper aimed to observe Pechay stem growth in loam soil planted in recycled fruit Styrofoam boxes and to upcycle Pechay stems in Ermita, Manila, Philippines, also observing signs of infection. An experimental design method was used, with Pechay seeds grown in the same container type with loam soil as a control. Out of 180 Pechay stems planted, 128 survived, showing a 71% survival growth rate. Pechay grown from seeds had a 98% survival rate.

Marjorie Tendero, C. Guyot · HAL (Le Centre pour la Communication Scientifique Directe) · Global

This article discusses the booming urban composting sector, driven by urban agriculture's new outlets for organic materials. Individual or collective composting offers a decentralized solution with positive impacts on the environment and neighborhood social relations. Its success requires material availability in common spaces, communication systems, support for residents' initiatives, and consideration of technical, ecological, agricultural, economic, and social aspects.

Rebecca S. Lewis · Digital Commons @ Butler University (Butler University) · United States (Indianapolis)

This project aimed to test if common urban farming management processes increase soil ecosystem health in Indianapolis. Researchers analyzed organic matter composition, carbon and nitrogen percentages, carbon-nitrogen ratio, soil pH, and bulk density from soil samples collected at multiple sites across the city. The study hypothesized that soil samples from actively farmed land would show increased health indicators, making them more similar to naturally established ecosystems than unfarmed controls.

Cindy Carolina Ortiz Franco, kleber Bajaña Avarado · · Ecuador

A study was conducted in the Atahualpa parish, Santa Elena province, Ecuador, on the design of an urban agriculture model for family garden development. The investigation was carried out through documentary research, comprising stages of diagnosis via surveys and interviews with council managers, approach, theoretical proposal based on survey results, methodological procedure, analysis, and conclusions on project viability. The diagnosis determined that farmers are interested in participating in the implementation of the urban agriculture proposal designed for the Atahualpa parish to improve food security and nutrition in families.

Md. Khalid Mahmud, Md. Forhad Hossain, Sk Monirul Islam, Asraf Ali, Md. Taslim Hossain · Big Data In Agriculture · Bangladesh (Dhaka)

An experiment conducted in Dhaka, Bangladesh, from October 2017 to March 2018, investigated the interactive effects of nitrogen and phosphorus on hybrid capsicum growth and yield in a rooftop garden. Three nitrogen levels (0, 100, 130 kg N ha-1) and three phosphorus levels (0, 50, 80 kg P2O5 ha-1) were applied. The combination of 130 kg N ha-1 and 80 kg P2O5 ha-1 significantly increased plant height, fruit diameter, fruit length, and fruit yield, suggesting optimal fertilizer application for enhanced growth and yield.

Santiago Manuel Sáenz Torres, Alfredo López, Lena Prieto, Tulio Rodríguez · Equidad y Desarrollo · Colombia (Bogotá)

The production potential of cubio (Tropaeolum tuberosum), an Andean native root vegetable, was investigated under urban agricultural conditions in Bogotá. Cubio was found to be highly nutritious, exhibit good performance under adverse edaphoclimatic conditions, show tolerance to pests and diseases, and yield excellent quality and productivity. Production was higher with organic fertilization compared to conventional chemical fertilizers.

Yadeneyro de la Cruz Elizondo, Juan Camilo Fontalvo-Buelvas · Suelos Ecuatoriales · Mexico (Xalapa)

In an urban green area in Xalapa, Mexico, soil quality was evaluated prior to the implementation of a university garden. The soil was brown and sandy loam with poor aggregate stability and a bulk density of 2.52 g/cm3. Biologically, earthworm density was poor at 67.2 ind/m2 and the number of edaphic groups was poor at 5, though pH was optimal at 6.58 and organic matter was medium at 6.45%. Overall soil quality was assessed as moderate, indicating a need for an integrated soil management plan for improvement.

Alexander Calero Hurtado, Yanery Pérez Díaz, Kolima Peña Calzada, Elieni Quintero Rodríguez, Dilier Olivera Viciedo · LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) · Cuba (Sancti Spíritus)

An experiment in Sancti Spíritus, Cuba, from February to April 2016, evaluated the effect of three bio-stimulants (ME-50, vermicomposting humus lixiviate, Biobras-16) on radish crops, with 45 plants observed per treatment. The bio-stimulants positively affected radish production, increasing average leaf production per plant, root diameter, biomass production, and yields to over 1.05 kg.m-2. Specifically, the ME-50 treatment reduced the percentage of damaged tuberous roots by 50% compared to the control.