Research & reports

Pei Yu · Digital Commons - RISD (Rhode Island School of Design) · United States (New York City)

This research explores waste management in New York City, the world's most wasteful city, seeking ways to bring waste back into the city and connect people with it. Phase I investigates the composition, quantity, and mobility of NYC's waste management, while Phase II focuses on organic waste and the potential of vacant lots in Lower East Manhattan. Phase III proposes a composting park on the East River, engaging residents in various stages of waste management, and aims to connect urban residents to collective waste and the biome's power to transform organic waste into soil, food, and a new life cycle.

D.V. Belobrova, Д. А. Шаповалов · Dokuchaev Soil Bulletin · Russia

This study conducted large-scale (1:5000) soil mapping of garden non-commercial partnerships in the Meshchera lowland of Noginsk district, Moscow region. Investigations revealed that initial soils underwent significant transformation since their creation, with soddy podzolic and boggy soils changing into agro-soddy podzolic soils and agrozems due to intensive development and fertilizer use. While these changes reflect increased productivity and quality of allotment soils, the transformed soils are characterized by neutral pH and high/medium mobile phosphorus content, but are poor in exchangeable potassium compared to natural soil profiles.

Dalmiro Cazorla-Perfetti, Pedro Morales-Moreno · DOAJ (DOAJ: Directory of Open Access Journals) · Venezuela (Coro)

This paper records the presence of deutonymphs of two mite taxa, Uroobovella Sensu lato Berlesse, 1903 and Cosmoglyphus Oudemans, 1932, in the urban area of Coro, Falcón State, Venezuela. These mites were found attached to the legs and/or abdomen of adult Desmometopa Loew, 1866 and Spalangia Latreille, 1805 specimens. The specimens were collected inside a dwelling, specifically in a plastic container with compost for growing vegetables and on the windows.

Kaitlin Hathaway · Digital Showcase Research, Scholarship, & Creative Works (University of Lynchburg) · United States (Lynchburg)

The Lynchburg College Community Garden at Beaver Point, United States, was established in 2016 by students and faculty to teach sustainable agriculture and enrich soil. In spring and summer 2017, projects included donating produce, promoting pollinators, raising chickens, and composting. The abstract also describes a designed rainwater collection and irrigation system.

Sabine O’Hara, Dwane Jones, Harris B. Trobman · Advances in higher education and professional development book series · United States

The Landgrant College of the University of the District of Columbia operates urban food hubs as the only exclusively urban land-grant university in the United States. These hubs utilize bio-intensive hydroponic and aquaponic systems and green roofs to maximize productivity in small urban spaces, and kitchens serve as business incubators and training facilities. They also promote waste and water reuse through composting, rainwater capture, and green infrastructure, offering training, wellness, and leadership opportunities to UDC students and DC residents.

Rosalie M. Sharp, Daniel J. Brabander · GeoHealth · United States (Boston)

This study assessed lead (Pb) bioaccessibility, transport, and exposure pathways in urban gardens in Roxbury and Dorchester, MA, in partnership with The Food Project, which brings local farmers into the research. Compost had lower total Pb, lower gastric Pb solubility, and less fine-particle resuspension than soils, with a mean bioaccessible Pb of 265 mg/kg—nearly an order of magnitude lower than soils. Across all matrices, grain sizes under 37 μm held a disproportionate share of bioaccessible Pb, whose isotopic composition pointed to leaded gasoline and leaded paint.

Maia G. Fitzstevens, Rosalie M. Sharp, Daniel J. Brabander · Elementa: Science of the Anthropocene · United States (Boston)

To support urban agriculture and limit childhood lead exposure from resuspended urban soils, this study measured bulk and bioaccessible lead in five types of compost used in Boston urban gardens. Different feedstocks showed unique geochemical fingerprints; bulk lead in compost was a fraction of that in urban soils, yet the bioaccessible fraction exceeded the IEUBK model's default parameters. Based on the observed bioaccessibility, 170 mg/kg total lead in compost yields the same bioaccessible lead as the model predicts for the 400 mg/kg EPA soil benchmark, so risk assessments should treat compost as an urban matrix.

Janneth Jara-Samaniego, M.D. Pérez-Murcia, M.A. Bustamante, C. Paredes, A. Pérez‐Espinosa, Irene Gavilanes-Terán, Marga López, Frutos C. Marhuenda‐Egea, H. Brito, R. Moral · PLoS ONE · Ecuador (Chimborazo Region)

This study developed a field-scale demonstration project in Ecuador's Chimborazo Region to evaluate composting technology for managing organic waste from food markets and urban gardening. Three co-composting mixtures were prepared using market waste and pruning materials. All piles showed suitable composting development with significant organic matter decomposition, and the resulting composts lacked phytotoxicity and possessed suitable agronomic properties for use as organic fertilizers.

Reni Amaranti · ETHOS (Jurnal Penelitian dan Pengabdian) · Indonesia

This community service activity provided assistance to communities in Indonesia to manage organic waste at the local Rukun Tetangga (RT) level. The aim was to support urban farming programs by addressing the uneven spread of knowledge and low public participation in waste utilization. The activity focused on helping communities utilize their existing potentials and resources for waste management.

Gaston E. Small, Brendan Sisombath, Lauren Reuss, Russ Henry, Adam D. Kay · Compost Science & Utilization · Global

The study measured the effects of different barley mash to wood chip ratios on nutrient retention in compost and subsequent vegetable yield. Nine compost piles (1 m3) were constructed with varying ratios, and the 50:50 mixture maintained internal temperatures above 55°C for 30 days. When the finished compost was used in raised-bed garden plots, arugula and tomato yields increased with compost barley mash content, but less than 5% of N and 2% of P were recycled into new vegetable production.

Nur Faizah Marwan, Bagas Setiono, Nur Indah · Jurnal Ilmiah Penalaran dan Penelitian Mahasiswa · Indonesia

Code Village in Indonesia faces severe river pollution, with heavy metal levels at 6-9 mg/l, exceeding the 3 mg/l standard. This paper proposes the "ECOBLUE" concept, which combines Blue Open Space (BOS) optimization with urban farming, prioritizing waste management to improve living standards. The concept involves managing organic waste for fertilizer and recycling plastic for vertical gardens, aiming to enhance health, education, and prosperity in Code Village.

María Luisa Álvarez, Gabriel Gascó, César Plaza, Jorge Paz‐Ferreiro, Ana Méndez · Land Degradation and Development · Global

This study compared peat, hydrochars from biosolids (HSL) and urban wastes (HUW), and their 50% volume mixtures with peat, as potential substrates. Ryegrass was grown in these mixtures, and hydrophysical and biochemical properties were analyzed. Treatments with biosolids hydrochar (HSL) and its mixture with peat (PT + HSL) increased ryegrass dry weight production by 184% and 216% respectively, compared to peat.

Dominique Massé, Moussa N’Diénor, Edmond Hien, Tovonarivo Rafolisy, Yacine Badiane Ndour, Alfonse Bilgo, Serge Houot, Christine Aubry · IRD Éditions eBooks · Sub-Saharan Africa

This chapter reviews research since 2006 on composting urban waste and using municipal landfill screenings in Sub-Saharan Africa. In Ouagadougou, urban waste compost significantly increased sorghum yields (2 to 5 times higher than controls) over two years, with phosphorus content being crucial when concentrated at plant level, and mineralization rate determining yield when spread. In Madagascar, soil from the Andralanitra landfill showed value as an amendment or fertilizer for tomato cultivation, though application principles and safety need definition. However, municipal landfill screenings from Dakar did not achieve yields comparable to horse manure when tested on tomato crops.

이윤숙 · · Global

Urban agriculture has gained emphasis due to its importance for leisure and recreation in modern society. However, public health may not be guaranteed due to continuous odors from animal compost. Biochar is an amendment that can reduce odors and enhance crop productivity, but this abstract is truncated and does not present specific research findings.

S. H. Ahmed, M. Emam, M. Abul-Soud · Zagazig Journal of Agricultural Research · Egypt (Cairo)

This study investigated the effect of different vermicompost rates (10%, 20%, 30%) and pot volumes (4, 6, 8 L) on celery and red cabbage grown under green roof conditions in Cairo, Egypt, during 2014/2015 and 2015/2016. Increasing pot volume from 4 to 8 L increased vegetative growth and yield but decreased economic efficiency. A 20% vermicompost rate increased vegetative and yield characteristics, while 30% had a negative impact. Increasing vermicompost from 10% to 30% increased N, P, and K contents, but increasing pot volume from 4 to 8 L/plant decreased N, P, and K contents.

Upite Joseph Tshala, Misonga Alain Kitabala, Mwamba Jean-Pierre Tunda, Kayakez Michel Mufind, Miji Arsene Kalenda, Kanyimbu Georges Kapele, Kimuni Luciens Nyembo · Journal of Applied Biosciences · Africa

This study, conducted from May 2015 to April 2016 in Kolwezi, assessed the agronomic characteristics of compost from household waste and determined its biodegradable fraction for agricultural use. Waste was collected from 100 households, revealing biodegradable and non-biodegradable fractions, with quantities varying by season and commune. The biodegradable fraction represented 53% of the average monthly waste of 1001.5 kg per household. Major element concentrations were relatively high compared to Cameroon, while heavy metal concentrations were well below international standards.

Volker Häring, Delphine Manka’abusi, Edmund Kyei Akoto-Danso, Steffen Werner, Kofi Atiah, Christoph Steiner, Désiré Jean‐Pascal Lompo, S.G.K. Adiku, Andreas Buerkert, Bernd Marschner · Scientific Reports · Sub-Saharan Africa

This 2-year study in Tamale (Ghana) and Ouagadougou (Burkina Faso) investigated the effects of biochar, wastewater irrigation, and fertilization on sandy, nutrient-depleted soils in urban vegetable production. Biochar addition (2 kg m⁻²) initially doubled soil organic carbon (SOC) stocks, but 35% SOC losses occurred afterward. Both biochar types had no effect on soil pH, phosphorus availability, or cation exchange capacity, though rice husk biochar retained nitrogen. The study found that the effects of biochar and waste water were less pronounced than reported elsewhere.

Pulido Barbosa, Cindy Gillary · · Global

This report details the results of the "Guardians of Nature" environmental project, which aimed to raise student awareness of environmental care through building a school garden and making compost. The project utilized recycled materials like plastic bottles for planting various vegetables and provided workshops to the entire educational community on environmental topics. This initiative led to changes in students' cognitive and procedural skills, fostering critical reflection and problem-solving, culminating in the successful construction and maintenance of a school garden.

Dong Sung Kim, Yong Joo Sung, Bomi Kim, Ji-Yoon Kim, Rizal Solehuddin, Young Seok Park, Yong-Gyo Seo · Journal of Korea Technical Association of The Pulp and Paper Industry · South Korea

In South Korea, this study evaluated whether rice husk fiber — derived from the biorefinery process used for rice husk silica extraction — could substitute for cocopeat, the major component of vegetation media used in artificial greening such as rooftop gardens, testing samples made with OCC or ONP pulp. Higher rice husk fiber content produced bulkier, weaker vegetation media, though water-holding capacity and disintegration resistance were little affected, and no effect on conductivity change was detected. The study concludes that substituting rice husk fiber for cocopeat is possible with optimized application practice.

Marta Bożym · Ochrona Środowiska i Zasobów Naturalnych · Poland

A study measuring heavy-metal content (cadmium, lead, copper, zinc, nickel, chromium) in compost and resident earthworms sampled from home composters and allotment gardens in the Opole region of Poland. The compost samples themselves were not contaminated with heavy metals and stayed within Polish legal limits for solid organic fertilizers. However, metal accumulation in earthworms varied by metal: the bioaccumulation factor (BAF) was high for cadmium, lead and zinc, while no accumulation was found for nickel, chromium or copper. The authors conclude that earthworm species native to Poland, such as Eisenia fetida, can serve as potential bioindicators of metals in the environment.

Luz Dary Agudelo Gutiérrez · Journal of research in engineering sciences. · Colombia

In Colombia, this study aimed to implement urban agriculture as a pedagogical and didactic strategy for training vulnerable populations in the production and consumption of healthy food, oriented toward food security. To structure a proposed design for agroecological gardens, the researchers carried out a participatory validation process with the community and supporting local professionals, aiming to spread knowledge and build community ownership of the project. The initiative aims to use vacant urban land for gardening that increases biodiversity while strengthening food security.

Aliyi Mama Gasu, Uma Devi Pongiya, Fatuma Hamid Mohammed · Journal of Environmental & Analytical Toxicology · Ethiopia

A study assessed the challenges and opportunities of composting organic solid waste in Robe Town, Oromia Regional State, Ethiopia, using a descriptive survey design with a sample of 384 households drawn proportionally from three kebeles using a combination of probability and non-probability sampling. Data were collected through questionnaires, interviews, field observation, and photography and analyzed with SPSS and Microsoft Excel. The study found that no proper composting of organic solid waste is currently taking place in the town. Barriers identified included lack of awareness, insufficient space for composting, lack of government support, absence of a policy framework, institutional gaps such as no dedicated urban agriculture department, and budget constraints. Opportunities noted included the large volume of available organic waste, farmers already engaged in urban agriculture, a suitable composting environment, high demand for organic fertilizer, and rising prices of chemical fertilizer.

Yann Dusza, Sébastien Barot, Yvan Kraepiel, Jean-Christophe Lata, Luc Abbadie, Xavier Raynaud · Ecology and Evolution · Global

This study examined how combinations of 20 plant species from 5 families, two substrate types (natural soil vs. artificial), and two depths (10 cm vs. 30 cm) affect green roof ecosystem functions including water retention, biomass production, nutrient cycling, and transpiration. Artificial substrates increased aboveground biomass 1.4-3.5 times relative to natural soil, and deep substrates produced 2-3 times more biomass than shallow ones on natural soil (1.4-1.9 times on artificial substrate), but no single combination of factors enhanced all studied ecosystem functions simultaneously.

Brown S.L., Chaney R.L., Hettiarachchi G.M. · Journal of Environmental Quality, 45(1):26-36 · United States

A review examining the risk that urban soil lead poses to urban agriculture. It concludes that adding compost, organic matter and phosphorus improves soil properties and reduces both the bioavailability of soil lead and fugitive dust, so urban agriculture is unlikely to raise children's blood lead. The findings support the safety of compost-centred soil management in urban gardens.

· Clean Technologies and Environmental Policy · Global

Proposes an economic assessment framework aimed at achieving sustainable composting quality in low-cost, small-scale composting contexts in developing countries.