Research & reports

Suwa Lal Yadav, Manish Yadav, Devilal Birla, Indra Raj Yadav · · Global

Organic farming is evolving by integrating regenerative techniques, agroecological principles, precision agriculture, and urban farming concepts to meet growing demand for organic products. This approach aims to improve agricultural output, address climate change, manage pests, and optimize resource use, contributing to a sustainable and ethically sound food ecology. The organic industry is projected to grow due to increased consumer awareness and education.

Moye Eric Kongnso · International Journal of Environment Agriculture and Biotechnology · Cameroon

A mixed-methods study in the West Region, Cameroon, examined compost use in urban farming through 265 household surveys, 11 in-depth interviews, and one focus group. While compost availability and technical assistance favor its use, small-scale farmers face significant technical, knowledge, financial, institutional, and policy constraints. State extension services prioritize mineral fertilizers over compost, and the current regulatory framework does not encourage compost use, leading to the persistence of traditional practices.

· KTH Publication Database DiVA (KTH Royal Institute of Technology) · Sweden

As a continuation of the ongoing "Soil Correspondences" project, people engaged in local soils were invited to write letters to soil. The letters were read and composted during a ritualized working day to create an 18-day compost, forming an ecosocial sculpture. This activity learned from the composting practices of artists Etta Säfve and Jona Elfdahl from the artist duo Gylleboverket, and the resulting compost will be returned as probiotics to the local soil.

Mohammad Enamul Hoque, Abdullah Al Mamun, Perengki Susanto · International Journal of Climate Change Strategies and Management · Bangladesh

A study collected data from 352 households in two major Bangladeshi cities to predict organic food production intention and behavior in urban rooftop gardens using the value-belief-norm (VBN) theory and theory of planned behavior (TPB). Findings showed that biospheric and egoistic values improved ecological worldview, which, along with awareness of consequences and social norms, predicted personal norms. Personal and social norms forecasted the intention to produce organic food in rooftop gardens.

María Virginia Maiza, Joan Muñoz‐Liesa, Anna Petit‐Boix, Verónica Arcas‐Pilz, Xavier Gabarrell · Resources Conservation and Recycling · Global

A life cycle assessment compared three human urine management strategies for nitrogen fertilizer production: an artificial wetland, an on-site lab-scale aerobic reactor (S2), and a centralized wastewater treatment plant. S2 showed the highest environmental impacts in 6 out of 8 categories, including high energy demand (750 kg MJ-eq) and ecotoxicity (602 kg 1.4-DCB-eq), although it offered an advantage in marine eutrophication. Upscaling S2 could reduce impacts and lower payback time, with nitrogen production exceeding 2.3 times the yearly demand for building tomato production.

Carmen K. Blubaugh, R. Chesnut, Katherine Hagan · Journal of Applied Ecology · Global

This study investigated how organic composts mediate the effects of plant diversity across trophic levels over two field seasons, conducting 18 experiments in school gardens. Vermicompost strengthened a positive relationship between flower richness and foliar-feeding omnivores, but predators increased with flower richness and were not affected by vermicompost. The net outcomes of vermicompost and plant diversity were neutral for herbivores.

Paolo Paolo · International Journal of Neutrosophic Science · Global

This study used a neutrosophic multi-criteria approach to evaluate the impact of biostimulants and organic additives on soil quality, plant growth, and crop yields in urban agriculture. Biofertilizers like Chromococcus and Azotobacter improved nutrient availability and plant health, while mineral additives like zeolites enhanced soil fertility. Three scenarios were analyzed: one showed exceptional plant growth and high sustainability (Very Very High), another highlighted challenges in vegetative growth and sustainability (Low), and a third combined good plant growth with high sustainability and climate change mitigation (Medium High).

Zzimbe, Adrian, Fuoss, Kylie, Armas, Joelle, Blubaugh, Carmen · SPARK Scholarship at Parkland (Parkland College) · Global

This experiment examines how water stress and vermicompost interactively shape pest attraction in urban agriculture, which faces challenges like water access and pest pressure. Vermicompost is hypothesized to mitigate water stress by enhancing organic matter and humic acids to improve water retention, and to relieve pest pressure by enhancing plant defensive chemistry.

Lubna Taj, Tahira Yasmeen, Waqas Haidar, Qasim Ali, Muhammad Arif · Soil & Environment · Pakistan

A two-year study (2016-2017) in Pakistan's peri-urban agricultural areas investigated the impact of seasonal variations in wastewater irrigation on sugarcane. Sugarcane irrigated with wastewater showed increased antioxidant activities compared to freshwater-irrigated plants, suggesting biochemical adjustments to contaminants. Significant seasonal differences in plant mineral content were also observed, indicating that wastewater irrigation can alter plant physiology and affect agricultural output.

Oscar Wang, Rosalind Deaker, Floris van Ogtrop · Agricultural Systems · Global

A systematic review using the PRISMA protocol searched for literature on food-waste based hydroponic fertilisers (FWBHF), identifying 6,840 papers with search terms combining "food-waste," "hydroponic," "fertiliser" and "organic," narrowing to 308 papers by title and abstract relevance and ultimately including 37 papers in the final review. The review sought to identify major challenges limiting yield outcomes in food-waste based hydroponic systems, explore conventional and non-conventional improvements, and propose a standardized reporting framework for future research, framed against a backdrop of an estimated 931 million tonnes of food wasted globally in 2018.

Richard Morris, Shannon Davis, Gwen‐Aëlle Grelet, Pablo Gregorini · Land · Global

Applying a GIS-based model (ESMAX), this study tests a spatial method called "Agroecology for the City," aimed at maximizing ecosystem services (ES) in outwardly expanding peri-urban development. Agroecological farm system (AFS) parcels of 1 ha and 4 ha were configured within a real-world 200 ha peri-urban residential development to identify arrangements maximizing the supply of three regulating ecosystem services the local community identified as critical, plus multifunctional performance across them. Configurations with AFS parcels interspersed evenly among built-up areas provided the best multifunctionality across the four ecosystem services tested.

Mélanie Douziech, Stefan Mann, Stefan Galley, Jens Lansche · Agronomy for Sustainable Development · Global

Urban agriculture is often associated with sustainable practices, but the diversity of systems classified as urban agriculture and limited information on their sustainability call that link into question. Drawing on 91 scientific papers, a study proposes a holistic classification of urban agricultural systems combining technical, social and economic characteristics, with economic production intensity and the intensity of cooperation among actors as key axes. One end of the scheme covers ground-based, open, socially motivated systems with high cooperation and low production intensity; the other end covers building-integrated, quasi-closed systems with high production intensity. Mapping sustainability claims from the literature onto the scheme associated "urban farming" with job creation, food safety, water savings and higher yields, and "urban gardening" with educational potential, biodiversity improvements and lower yields.

J.A. Veraart, Cora van Oosten, Vincent Linderhof, Confidence Duku, Wilfred Appelman, A.M.E. Groot, Marjolein Sterk, Ilse Voskamp · International Journal of Water Governance · Global

With water-related problems from climate change threatening the future of food systems in both the Netherlands and Ghana, this comparative case study analyzed rainwater harvesting and wastewater reuse in the Rhine-Scheldt Estuaries (Netherlands) and the Bono East Region (Ghana). The analysis focused on identifying similarities in how experts and stakeholders use spatial information to remove barriers to, or foster enablers of, the uptake of nature-based solutions (NbS) in view of climate change. Both rainwater harvesting and wastewater treatment techniques were found to be available and ready for adoption by farmers and the food processing industry, but their uptake was hampered by multiple barriers ranging from biophysical and technical to social and institutional. Spatial information was concluded to be a potential enabler for NbS adoption if applicable to a wide range of possible solutions for water scarcity in food production, though both case studies showed difficulty making the future spatially explicit, and in both cases the effect on biodiversity of, respectively, effluent water reuse and rainwater harvesting did not play a direct role in stakeholder dialogue.

Haochen Zhao, James T. O’Connor, Sarah Zou, Zakaria M. Solaiman, Bede S. Mickan, Nanthi Bolan · Soil Use and Management · Australia

At six community gardens across three soil mapping units — calcareous deep sands, coloured sand and pale sands — in the Perth metropolitan area, Australia, soil samples were compared between cultivated raised beds and adjacent bare ground used as a control. Raised-bed soils showed lower bulk density, higher pH buffering capacity, more available nitrogen, phosphorus and potassium, greater cation exchange capacity, total carbon and microbial biomass than surrounding urban soil, and were estimated to have accumulated 0.55 kg of carbon per square meter (5.5 t/ha) in the top 10 cm, with no significant heavy metal contamination detected in any of the garden soils. The improved soil health and carbon storage were attributed mainly to regular application of compost produced within the gardens.

Benedicta Yayra Fosu-Mensah, Nathanael Nii-Odai Laryea, Daniel Darko, Michael Mensah · Heliyon · Ghana (Accra)

In the Greater Accra Metropolitan Area of Ghana, which generates about 2,291 tonnes of municipal solid waste daily (roughly 14% plastic), researchers analysed two municipal solid-waste composts, two dried sewage sludges and a reference soil with five replicates each. Microplastic loads were highest in sludge 1 at 4,316 ± 968 particles/kg, followed by compost 1 at 3,572 ± 1,196, compost 2 at 3,104 ± 418 and sludge 2 at 2,024 ± 562, against 232 ± 62 in the reference soil. Polyethylene, polyester and polypropylene dominated. The results show that returning urban organic waste to soil also carries microplastics into soils and crops. Limitations: only five sampling sources, and FTIR polymer identification applied to a 10% subsample.

Hall S.M., Tikku V., Heiger-Bernays W.J. · Environmental Health Perspectives, 131(11):115001 · Global

Examines equity and safety in urban organic-waste cycling through a case study of waste-to-compost activities and legislation in four US cities. It warns that contaminants such as pesticides, lead, and PFAS and inconsistent regulation can worsen racial inequities in access to urban farmland and safe compost, and recommends justice-oriented policy with multilingual education and proper waste disposal.

Coulibaly S.F.M., Aubry C., Provent F., Rousset-Rouvière S., Joimel S. · Environmental Research Letters, 18(7) · Global

A review synthesizing existing research on how far green roofs can support urban biodiversity, framed by their design and modes of use. It finds green roofs can provide habitat for soil organisms and pollinators as well as plants, but that the effect depends strongly on design such as substrate depth and vegetation diversity, and recommends integrating soil communities into construction guidelines and increasing heterogeneity at roof and landscape scales.

Sokolowski A.C., Álvarez V.E., Mangiarotti A., Gonçalves Vila Cova C. · Agroecology and Sustainable Food Systems · Argentina (Buenos Aires)

In Buenos Aires peri-urban family farms, TAPE surveys and soil measurements showed that self-defined agroecological farms outperformed conventional ones on soil health indicators including aggregate stability and organic carbon.

Riaño-Herrera D.A., Varela-Martínez D.A., Chenet J.G., García-García D.A., Díaz-Verus S.D. · Sustainable Cities and Society · Colombia (Bogotá)

This case study analyzed rooftop organic agriculture in Bogotá over 11 months, documenting an 82.1% relative yield from 336 harvested vegetables and estimating food autonomy potential for over 11,000 families through 432 projects.

Royer H., Yengue J., Bech N. · ScienceDirect · Global

Systematic review of biodiversity impacts of urban agriculture globally, comprehensively analyzing agriculture's role in urban ecosystems.

· Biomass Conversion and Biorefinery · Global

Examines decentralized in-vessel composting as an efficient technology for managing biodegradable solid waste.

· Agronomy · Global

Investigates the degradation of municipal waste through vermicomposting using a combination of Eisenia fetida and Lumbricus rubellus.

· Frontiers in Sustainable Food Systems · Global

Studies discarded tea waste as a low-cost, sustainable substrate for oyster mushroom cultivation, assessing biological efficiency and nutritional quality. Demonstrates reuse of an agricultural waste stream for cheap mushroom production.

· Current Issues in Tourism · International

Analyzes the push and pull motivations of international volunteer workers (WWOOFers) who participate in labour and exchange on organic farms.

Dorr, E., Hawes, J.K., Goldstein, B., Fargue-Lelièvre, A., Fox-Kämper, R., Specht, K., Fedeńczak, K., Caputo, S., Cohen, N., Poniży, L., Schoen, V., Górecki, T., Newell, J.P., Jean-Soro, L., Grard, B. · Agronomy for Sustainable Development · Global

A citizen-science study collecting data from 72 urban agriculture sites across France, Germany, Poland, the UK and the USA to analyze yields and resource use. Most plots yielded between 0.5 and 2 kg/m².