Research & reports

Fabio Aislant Moreno · GACETA DE PEDAGOGÍA · Global

This documentary review analyzed 18 articles published between 2018 and 2022 to examine agroecological school gardens as a didactic strategy for sustainability. The analysis found that such gardens, when oriented towards education for sustainable development, should involve cooperative learning processes from a transversal perspective. It concluded that agroecological school gardens are key to developing socio-critical skills in students through theoretical and practical work, enhancing their sensitivity to environmental problems.

Leila Babaei, Mohammad Hossein Niksokhan, Ali Torabian, Masoud Negahban‐Azar · International Journal of Sustainable Development & World Ecology · Iran

This study proposed sustainability measurement indicators to evaluate the Water-Energy-Food (WEF) Nexus sustainability in urban agriculture. Focusing on Varamin, a semi-arid city in Tehran, the Analytical Hierarchy Process (AHP) was used to identify crucial indicators across social, environmental, and economic dimensions. Results indicated that water-related components are critical in arid and semi-arid regions, and pollution prevention holds a 52.8% priority as an environmental sustainability indicator.

Paul Suski, Alexandra Palzkill, Melanie Speck · Frontiers in Sustainability · Global

This article argues that sufficiency, often underestimated, is a suitable strategy for achieving a sustainable circular economy. It proposes shifting research and policy focus from product-centric approaches to consumption patterns guided by sufficiency. The case of urban gardening illustrates how small interventions can transform consumption by challenging the logic of availability. The authors advocate for using social practice theories to develop effective circular economy strategies.

Wulan Sari Sinaga, Desyana Millenia Limeranto, Eugenia Larissa Bakti Pangala, Kukuh Madyaningrana · Pro-Life · Global

This research investigated the macro nutrient content of fruit peel-based liquid organic fertilizer (LOF) and its effect on Pakcoy (Brassica chinensis L.) growth over 56 days, using a completely randomized design with five treatments and five replications. The study found that the macro nutrients in the fruit peel-based LOF did not meet the Ministry of Agriculture's quality standards. However, a 0.4 mL dose of the fruit peel-based LOF showed the best effect in supporting Pakcoy plant growth across all measured parameters.

Govinda Prasad Devkota · Pragyaratna प्रज्ञारत्न · Nepal

This participatory action research in a public high school in Nepal explored the applicability of urine diversion toilets for organic vegetable production and sanitation improvement. It found that urine diversion toilets prevent surface water pollution and improve students' hygiene. Additionally, using human urine as fertilizer increased vegetable production by 40% compared to animal fertilizer in plots of the same area.

Isaac Asirifi, Korbinian Kaetzl, Steffen Werner, Stefanie Heinze, Felix K. Abagale, Marc Wichern, Manfred Lübken, Bernd Marschner · Journal of soil science and plant nutrition · Ghana

This study evaluated the agronomic and soil fertility effects of using municipal wastewater or anaerobically treated wastewater for irrigation and applying biochar to a soil from the Guinea savanna agroecological zone of Ghana. In a pot trial, lettuce and carrot were grown on soil mixed with raw biochar, water-washed biochar, or biochar used as wastewater filter material at 20 t ha−1, and irrigated with untreated municipal wastewater, anaerobically treated wastewater, or clean water. Results indicated higher crop growth and yields (up to 90% increase) with untreated and anaerobically treated wastewater than clean water, with anaerobically treated wastewater being more beneficial than untreated wastewater (up to 10% increase). Combining raw biochar with anaerobically treated wastewater increased pH, CEC, and P availability in the highly weathered acidic soil.

Alpana Kusum · · Global

This chapter reviews composting, the conversion of organic waste into nutrient-rich compost, distinguishing between municipal solid waste, agricultural residues, and industrial organic waste as source materials, and describing aerobic composting, anaerobic composting, and vermicomposting methods. It states that managing the carbon-to-nitrogen ratio, moisture, temperature, and aeration is important for effective composting, and lists benefits including improved soil fertility, nutrient recycling, water-holding capacity, erosion control, and reduced greenhouse gas emissions through carbon sequestration. It covers applications in agriculture, horticulture, landscaping, urban gardening, land reclamation, and bioenergy production, while also noting challenges such as managing contaminants, odor control, monitoring, and regulatory compliance.

Samir A. Haddad, Hossam Abdelmageed, Abdelaziz Saleh, Samia Ahmed, M. M. Abd El-Azeim, Joanna Lemanowicz, Gaber E. Eldesoky, Omar Saad · Sustainability · Egypt

Incubation and pot experiments under controlled greenhouse conditions used clay and sandy soils collected from peri-urban agricultural areas near El-Minia, Egypt, to test how different biochar application rates affected faba bean growth, cellulose decomposition, nodulation, and carbon-cycling enzyme activities. Biochar at 3 kg/sq·m was the most effective treatment, followed by 2 kg/sq·m; counts of cellulose-decomposing microorganisms rose to a high level in both soil types by 60 days of incubation and then declined by 90 days regardless of biochar rate, while clay soil showed significantly greater fresh and dry weight than sandy soil, and biochar overall improved soil health, microbial communities, and faba bean nodulation and growth.

Jean Pascal · Biodiversity online journal. · Global

Noting that insects constitute most of the biodiversity on Earth and provide a wide range of services to society while being threatened by human activities such as habitat destruction and urbanization, this article assesses advances in understanding the impact of insects on sustainable food production in low-income countries. It focuses on two research topics that have emerged in recent years: entomophagy combined with the creation of small household farms rearing insects for sale (the Thai example), and the use of insects to improve soil fertility and nutrient availability (the Zai example). The article advocates considering the diversity of solutions and adaptations found in nature, arguing that the ways local communities and ethnic groups use natural resources are vast and should be seen as a source of inspiration for scientists developing sustainable food systems.

Aikaterini N. Martini, Μ. Papafotiou, Ioannis Massas, Nikoleta Chorianopoulou · Plants · Greece

Origanum dictamnus, a perennial herb endemic to Crete, Greece, was grown at two cultivation sites in Athens — an extensive green roof and ground level next to a moderate-traffic road — in two substrate types at 10 cm depth, to examine growth along with nutrient content (N, P, K, Na) and heavy metal accumulation (Cu, Pb, Ni, Mn, Zn, Fe) in its tissues. Plant growth was favored by the soil substrate but was also satisfactory in the soilless substrate. Cultivation site affected heavy metal accumulation, with higher concentrations found in leaves and flowers at street level, though no differences appeared in roots. Washing reduced heavy metal concentrations only in leaves grown at street level. Substrate type significantly affected manganese concentration in all tissues and iron concentration in roots, with the highest values in the soil substrate. The species could be cultivated on sustainable green roofs, preferably on a soilless substrate to reduce structural weight, but careful selection of the cultivation site was identified as necessary to minimize contamination with environmental pollutants when human consumption is intended.

Mahsa Tarashkar, Mansour Matloobi, Salman Qureshi, Akbar Rahimi · Ecological Indicators · Global

This study investigated the effects of tea waste compost on the growth traits of radish (Raphanus sativus L.) and explored whether a clean carbon dioxide source from urban households could contribute to sustainable production. Tea waste gathered from urban households was decomposed for four months and mixed at 0–75% by volume with loamy garden soil; using a split-plot design, one greenhouse was enriched to an elevated CO2 concentration of 1500±100 ppm while a second was kept at the ambient level of 500±20 ppm. Results showed that elevated CO2 negatively affected radish yield, biomass accumulation, and vegetative growth parameters, while increasing volumes of tea waste compost, up to 75%, improved growth traits. At 75% tea waste compost, elevated CO2 had the same effect on growth traits as the normal level, showing a positive effect on total fresh weight but negative effects on total dry weight, leaf dry weight, and total leaf area. The study attributes the strongest support for radish growth at the highest compost volume (75%) to its high nitrogen content.

B. BOLOU-BI Emile, Philippe GUETY Thierry, TRAORE Adama, KONE Brahima · African Journal of Agricultural Research · Global

To evaluate the effect of biochar on tomato production in acidic soil, a complete randomized block design with 5 replications tested four treatments: 0% (T0, control), 8% (T1), 12% (T2) and 16% (T3) biochar application, measuring plant height, stem diameter, leaf number, fruit number and biomass. Plants receiving biochar (T1, T2, T3) were taller than the unamended control (T0); T1 plants averaged 12±2 fruits per plant, while T0 control plants produced no fruit at all, and T2/T3 fruit counts fell between the control and T1. Soil chemical analysis showed exchangeable cations, cation exchange capacity, pH, soil organic matter, total nitrogen and C/N ratio all higher than the initial soil, though treatments had no significant effect on soil enzymic activity. The study recommends recovering waste as an organic material source in urban horticulture and open-field cultivation to restore soil fertility.

FAO, Rikolto, RUAF · Food and Agriculture Organization of the United Nations (FAO), Rikolto & RUAF · Global

A comprehensive guide co-published by FAO, Rikolto and RUAF for local decision-makers, urban planners and practitioners. It frames urban and peri-urban agriculture from production through to urban food systems and policy, promoting reduced food loss via short supply chains, biodiversity protection, social inclusion, and urban-rural linkages.

Shimpo N. · 学芸出版社 (Gakugei Shuppan), ISBN 978-4-7615-2821-8, 208pp · Global

Shimpo's single-authored book on 'urban-type gardens' that activate underused spaces scattered through cities—suburban abandoned farmland, corners of urban parks, commercial-building rooftops, housing-estate grounds. Drawing on advanced cases and practitioner interviews from Germany, Austria, New Zealand, Canada, Australia and Japan, it shows how such gardens address vacant-land use, community revitalisation, greening and food/environmental education.

Vega Castro D.A., Vega Clavijo L.T. · Revista Luna Azul · Colombia (Bogotá)

This study sampled soil, irrigation water, and lettuce from 49 urban gardens across 13 Bogotá localities to quantify heavy metals (Pb, Cd, Cr, Ni, As, Hg), finding that all detected concentrations remained below national and international health-based guidance values.

· Environment, Development and Sustainability · Sri Lanka

Explores composing a low-cost green roof substrate from locally available organic wastes, arguing that organic wastes offer higher plant-nutrient content, water retention and suitable pH compared with recycled aggregates.

Ionat; id_orcid 0000-0001-9080-2282 Zurr, Oron; id_orcid 0000-0002-2893-5364 Catts · UWA Profiles and Research Repository (University of Western Australia) · Australia

The "Sunlight, Soil & Shit (De)Cycle" project, presented by SymbioticA in February 2022, is a performative experiment exploring agricultural technology (AgTech) and its aim to remove natural elements like sunlight, soil, and organic waste from food production. This project considers whether the precursor to sustainable food systems will be the creation of a metabolic rift, where the means of production grow ever distant from nature. It highlights a critical environmental tradeoff by questioning the separation of humans from nature in technological farming.

Yurisandra Sierra Reyes, Ernesto Juniors Pérez Torres, Ana de Dios Martínez, Manuel Francisco Rodríguez Saldaña, Arialsis Adán Verdugo · Zenodo (CERN European Organization for Nuclear Research) · Cuba (Camagüey)

To evaluate the use of agroecological technologies in the Urban Farm of Camagüey municipality, semi-structured anonymous surveys were applied to 77 managers and producers (43 producers, 34 managers) working in the Urban, Suburban, and Family Agriculture Program. The surveys identified agroecological technologies such as crop rotation and intercropping, biofertilizers, insect traps, and biological products. Organopónicos, semi-protected, and intensive gardens were identified as the units systematically applying these technologies, with farms and plots doing so to a lesser extent.

Jihan Faouzi, Imane Bedoui, Sanae Rezouki, Tarik Moubchir, Aimad Allali, Noureddine Eloutassi, Amal Lahkimi · Ecological Engineering & Environmental Technology · Morocco (Fez)

This study in Fez, Morocco, compared bacteriological and parasitological contamination in urban, peri-urban, and rural irrigation waters, and their transfer to soil and crops (cardoon and eggplant). Investigated microorganisms included total and thermotolerant coliforms, helminth eggs, Salmonella, and cholera vibrio. Results revealed contamination exceeding national and international standards for both types of coliforms in treated wastewater (TWW), wastewater (WW), Oued Fez water, and upstream well water in both winter and summer. This fecal contamination was found in soils and crops irrigated by urban and peri-urban water. Helminth eggs and cholera vibrio were also present in these waters, soils, and crops, with Salmonella detected in TWW in summer. Only the plot irrigated with Oued Bitit water in the rural zone met standards across all three levels of irrigated water, soil, and plants, and in both periods.

Shiyu Cui, Wenbin Liu, Hexian Jin, Yi Qiao, Ying Wang, Dan Liu · Atmosphere · Global

This study investigated the effects of mixed cropping garden plants (Festuca arundinacea, Ageratum conyzoides, Trifolium repens) with Brassica parachinensis on Cr-contaminated soil remediation. While mixed cropping with Trifolium repens resulted in the highest B. parachinensis yield and Cr content below standard in edible parts, mixed cropping with Ageratum conyzoides aggravated Cr pollution in edible parts of B. parachinensis, making it unsuitable for planting.

Kamonashish Haldar, Katarzyna Kujawa-Roeleveld, Tapos Kumar Acharjee, Dilip Kumar Datta, H.H.M. Rijnaarts · The Science of The Total Environment · Bangladesh

This paper assesses urban water as an alternative freshwater resource for irrigation in the Bengal delta, Bangladesh, where coastal plains face irrigation water shortages. Using the FAO AquaCrop model, it was found that 7.4 million m3 of irrigation water is needed for Boro rice during the dry season, while over 8.2 million m3 of urban water is generated. Mismatches between demand and supply occurred in February and March, suggesting a need for water storage capacities and policy changes to facilitate urban water reuse infrastructure.

Jilmar Gustavo Comas Piñere · GACETA DE PEDAGOGÍA · Global

This article, based on a qualitative documentary design, explores the agroecological school garden as a pedagogical scenario to strengthen learning and address environmental sustainability issues. The study aimed to highlight the importance of the educational process in improving student nutrition and quality of life. It concludes that establishing school gardens as an integral "learning by doing" strategy is crucial across all knowledge areas and educational levels.

Shefaza Esmail, Maren Oelbermann · Frontiers in Soil Science · Tanzania (Mwanza)

This study investigated farmer perspectives and compost application for soil management in urban agriculture in Mwanza, Tanzania. Semi-structured interviews with 34 urban farmers revealed concerns about climate change and unpredictable rain, with 82% desiring soil improvements. A field trial showed that organic amendments (poultry manure and food waste compost) improved soil water holding capacity by 14-19% and enhanced microbial biomass 1.7-4 times compared to inorganic nitrogen fertilizer, with comparable crop productivity.

Abhishek C, Soumya T V, V. Ajith · Zenodo (CERN European Organization for Nuclear Research) · Global

This study evaluated the effect of coir grow bags as an alternative to plastic grow bags on plant growth and yield. Seedlings of amaranthus, tomato, brinjal, chilli, herbs, medicinal plants, and ornamental plants were transplanted into coir grow bags and synthetic grow bags for comparison. Results showed that plants grown in coir grow bags exhibited higher yield and plant height, along with noticeable improvements in visual plant condition, compared to those in synthetic grow bags.

Aurore Guillaume, Anna Hubatová-Vacková, Vladimír Kočí · Agriculture · Czech Republic

A Life Cycle Assessment (LCA) was performed on several egg-producing subjects in the Czech Republic, representing four main laying systems (enriched cages, barns, free-range, and organic), which were also compared to a community garden system. The study's results suggest that feed conversion ratio (FCR), feed composition, and manure management are the most important factors influencing the total environmental impacts of eggs. Additionally, environmental benefits linked to outdoor access or using organic feed over conventional were observed.