Research & reports

Naomi Shimpo, Toru Terada, Makoto Yokohari · Journal of The Japanese Institute of Landscape Architecture · Japan

This study examines the feasibility of organic material circulation from turning increasing vacant lots in suburban Japan into allotment gardens, comparing three scenarios with different degrees of gardenization. Composting experiments identified the composition of organic materials needed to produce usable compost and the amount of compost required to gardenize vacant lots, while a separate analysis determined how many households would need to cooperate in supplying organic materials under each scenario. The study found that the weight ratio of kitchen waste to pruning waste for usable compost was 3:2, and that cooperation from at least 16 households would be needed to produce enough compost to gardenize an average-sized housing lot. It concludes that the scenario limited to existing gardens on vacant lots is feasible for organic material circulation, while the other two scenarios, which assume more extensive gardenization, would require greater understanding among urbanites.

Rosanne Wielemaker, Jan Weijma, G. Zeeman · Resources Conservation and Recycling · Netherlands

A study on Rotterdam, the Netherlands, assessed how source-separation-based New Sanitation (NS) systems could match the supply of nitrogen, phosphorus, and organic matter with demand from Urban Agriculture (UA), premised on the view that sustaining cities long-term requires a circular metabolism where the output ('waste') of one urban process becomes input for another. Applying the Urban Harvest Approach, originally developed for the urban water cycle, to nitrogen, phosphorus, and organic matter across two UA typologies (ground-based and rooftop) and four NS concepts treating domestic urine, feces, and organic kitchen waste, the study found that UA's demand for nutrients and organic matter could be reduced by 65-85%, with full (100%) self-sufficiency achievable for phosphorus, while nitrogen and organic matter would reach only partial self-sufficiency.

Shlrene Quaik, Kaizar Hossain, Mahamad Hakimi Ibrahim · International Journal of Agricultural Research · Global

Liquids derived from vermicomposting of pre-composted cow dung—vermiwash and vermicomposting leachate—were diluted to prevent leaf scorching and applied to sweet potato as a foliar treatment. Chemical analysis confirmed the presence of plant nutrients, and increases in chlorophyll content (chlorophyll a, b and total) and improved nutrient distribution in sweet potato leaves were observed. The results indicate vermiwash and vermicomposting leachate have potential as organic foliar fertilizers, and their application in field-scale urban farming fertigation is feasible, though enriching their nutrient content further would require adding other nutrient-rich substrates.

Connor J. Fitzmaurice, Brian J. Gareau · Yale University Press eBooks · United States

This 2016 book chapter profiles Scenic View Farm in New England, United States, run by owners John and Katie, surveying the farm's history and characteristics relative to other New England farms and describing its landscape. Community Supported Agriculture (CSA) programs, which farms like Scenic View depend on for stable sales, require growing diverse crops to meet consumer demand; flowers enhanced the farm's appearance and yielded consistent profits in years when other crops merely broke even. Among the challenges organic farms face, the chapter describes a tomato blight outbreak that swept the region, which Scenic View's CSA helped the farm weather while maintaining its organic certification. Access to supplemental income is described as critical to the farm's continuation, and the chapter portrays farmers, including some who feel they cannot eschew pesticides entirely, trying to farm as responsibly as their circumstances allow.

M.P Dr. Enny Zulaika · · Indonesia

A study using Azotobacter isolated from eco urban farming land at ITS, Indonesia, tested resistance and bioaccumulation of mercury (HgCl2) via selective media isolation, streak resistance testing and atomic absorption measurement, analyzed by ANOVA and LSD at the 5% level. Three isolates (A5, A6, A9) tolerated HgCl2 up to 20 mg/L, and at 5 mg/L exposure the highest bioaccumulation efficiency was recorded for A5 (89%) and A9 (87%).

Cristian Suzin Magrin, Angélica Ferari Rodrigues · Mostra IFTec em Resumos · Brazil

This report from Brazil describes aquaponics — a system combining fish farming and soil-free hydroponic plant cultivation, in which fish waste nourishes plants that in turn filter the water for the fish — through a literature review and an experimental simulation of an aquaponic setup with a physically separate fish tank and hydroponic unit connected by pumping. It states the system requires no removal of final filtration waste and less complex filtration than aquaculture, has lower pest losses and earlier harvests than soil-based gardens, and operates at low cost, and concludes it is a sustainable, economical food-production approach suited to both household and industrial scale.

Irina Stanishevskaya · Educational Media Reviews Online · Global

A media review covers the documentary Inhabit (2015, 92 min), directed by Costa Boutsikaris and produced by Emmett Brennan. It opens with a quote by permaculture co-originator Bill Mollison — "All we need to live a good life surrounds us: sun, wind, people, buildings, stones, sea, birds, and plants" — and explains permaculture as combining "permanent" and "agriculture" to adapt ecosystem principles to agriculture and living in harmony with nature. Citing figures that the US applies 900 million tons of pesticides annually and loses about 3 tons of topsoil per acre per year, the film introduces people who apply permaculture principles to farms, orchards, gardens, landscape and playground design, including Ben Falk (founder of the Whole System Design Permaculture Research Farm, Vermont), Eric Toensmeier and Lisa Depiano (Massachusetts), Lisa Fernandes (Maine), Steve Whitman (New Hampshire), and Dwaine Lee, an urban designer in New York involved with the Five Boroughs Green Roof on Randall's Island.

Luz Andrea Tautiva Merchán, Fabián Enrique Martínez Camelo · · Colombia

A brochure describing demonstration and training modules on urban and peri-urban agriculture - organic food production systems for limited spaces - that Colombia's agricultural research corporation Corpoica has established and run at its research centers since 2006. It describes the institutional program itself and does not present empirical outcome data.

Anjar Lulu Sakinah · · Indonesia

Mercury is a highly toxic and hazardous heavy metal, and bacteria able to live in mercury-contaminated habitats — mercury-resistant bacteria, including Azotobacter — are known to exist. This study aimed to obtain superior Azotobacter isolates resistant to mercuric chloride (HgCl2) from land at the ITS (Institut Teknologi Sepuluh Nopember) Eco Urban Farming site — land where mercury contamination was present — and to determine mercury reductase enzyme activity as a bioreductant converting Hg2+ to Hg0. Isolation used selective Azotobacter agar media, resistance was tested by a slant-agar streak method containing HgCl2, and mercury reductase activity was analyzed using the MRA method and spectrophotometry at 340 nm. Ten HgCl2-resistant Azotobacter isolates were obtained; isolates A5 and A9 tolerated 10 mg/L HgCl2 with optimal growth and relatively high mercury reductase activity, showing a reduction capacity of ≥3 mg/L and a reduction efficiency above 70% at an HgCl2 concentration of 5 mg/L.

Sandra Yamile Salamanca Corredor, Brayan Osnaider Diaz Morales · · Colombia

This pilot study, focused on the La Estancia neighborhood of Bogotá, assessed the technical and economic feasibility of implementing home practices for utilizing household waste -- (1) vermiculture for organic waste, (2) urban agriculture and vertical gardens, and (3) reuse of greywater for non-potable uses. It also investigated whether residents of the neighborhood already use these practices for managing waste and greywater, and their level of interest in the topic.

California State Legislature · California State Legislature · United States

California's SB 1383 (2016) targets short-lived climate pollutants, setting statewide goals to cut organic waste disposal by 50% by 2020 and 75% by 2025 (both from a 2014 baseline), recover at least 20% of currently disposed edible food for human consumption by 2025, and reduce dairy and livestock methane emissions 40% below 2013 levels by 2030.

Thomaier S., Specht K., Henckel D., Dierich A., Siebert R., Freisinger U. B., Sawicka M. · Renewable Agriculture and Food Systems 30(1):43-54 · Global

Survey of 73 zero-acreage (building-based) farms across four continents, analyzing innovative technologies, supply patterns, and business networks of commercial hydroponic and aquaponic urban farming.

Joshua W. Beniston, Rattan Lal, Kristin L. Mercer · Land Degradation & Development · United States (Youngstown)

In Youngstown, Ohio, this study measured soil and plant responses to organic-matter amendments made from yard wastes and to raised beds on vacant lots where houses had recently been demolished. Two years after application, the amendments significantly improved soil physical, chemical, and biological properties and increased vegetable yields, with a soil quality index comparable to rural agricultural soils. The results indicate urban agriculture can be productive on vacant land and that yard-waste amendments can restore degraded urban soils.

Stephane Bour · · Global

Ecotrancoso focuses on restoring life to an ecosystem that has been transformed into a desert by unsustainable agricultural practices. This is achieved through the creation of a food forest.

Yan Xiaohui · Digital Commons - Lingnan (Lingnan University) · China

This paper presents a lecture by Mr. Yan Xiaohui on Community and Ecological Agriculture, focusing on the experiences and reflections of Little Donkey Farm. The lecture discusses the farm's origins, current activities, and future vision for a shared community.

M. G. Dahiru, Onaiwu Idahosa Enabulele · · Nigeria (Kano)

Microbiological and physicochemical parameters of urban wastewater from the Jakara Canal in Kano were analyzed to assess its potential for irrigation. Mean fecal coliform counts ranged from 64.43 ± 63.20 MPN 100/ml to 216.85 ± 350.16 MPN 100/ml, increasing along the canal. All physicochemical parameters were within FEPA and WHO/FAO acceptable limits, but conductivity needed monitoring to avoid salinity.

P. S. Yuniar, Widiatmaka Widiatmaka, A. M. Fuah · Jurnal Ilmu Produksi dan Teknologi Hasil Peternakan · Indonesia (South Tangerang)

This research analyzed the advisability and potential for beef cattle development in South Tangerang, Indonesia. Data was collected through interviews with stakeholders, observations of livestock locations, and secondary sources. The study used Analytical Hierarchy Process (AHP) and SWOT analysis to formulate development strategies, finding that waste management, biogas technology, farmer cooperative capacity building, and government land-use support are important for sustainability, farmer income, and food security.

Rosangela Medeiros Hespanhol · Confins · Brazil (Natal)

This study analyzed the trajectory of farmers from AMIGS (Association of Friends and Producers of Vegetables Residents of Sitio Gramoré and Adjacencies), a significant vegetable supplier in Natal, Brazil, who have been transitioning from conventional to organic production since 2012. The organization of farmers through the association and partnerships with companies and institutions were crucial for enabling this change, reducing dependence on intermediaries through direct sales at ecological fairs. However, problems related to the individual acquisition of inputs and conflicts with farmers still using conventional systems were observed.

Óscar Moreno Flogia, Andrea Navarrete, Fernando Rodríguez Cortés · · Colombia

This article presents research results on how to approach the concept of "sustainable development" by teaching organic agriculture principles in a school garden at Liceo Campestre Bosque Andino in Sibate, Cundinamarca, Colombia. Constructivism and meaningful learning served as the pedagogical framework, with concept maps and the Likert scale used as assessment tools.

Jong-Jin Lee, Ki Woon Chang, Ki-Pil Han, Joo-Hwa Hong, Dong‐Soek Lee, Young‐Jun Kim · 유기물 자원화 · South Korea

This study manufactured kitchen garden soil for urban agriculture and conducted a growth experiment with lettuce. Soil mixed with peatmoss, livestock manure, cocopeat, zeolite, and microbial fertilizer in a 49:35:10:5:1 ratio showed appropriate levels for pH, total nitrogen, available phosphate, cations, and salt content. In the lettuce growth experiment using this manufactured soil, leaf length increased by 21%, leaf width by 20%, chlorophyll content by 17%, and biomass by 22% compared to the control group.

David Mkwambisi, Andrew J. Dougill, Philip Antwi‐Agyei, C. P. Chabvuta · CABI eBooks · Malawi

Research in Lilongwe and Blantyre, Malawi, assessed urban agriculture's potential to improve soil quality, crop yields, and livelihoods. Preliminary evidence showed urban waste could address food insecurity and soil nutrient benefits, but several constraints in waste management were identified. City authorities are not proactively utilizing organic municipal waste for soil quality and agricultural production benefits.

Baptiste Grard, N. Bel, Marchal, Nicolas, Frédéric Madre, Jean‐François Castell, Philippe Cambier, Sabine Houot, Nastaran Manouchehri, Stéphane Besançon, Jean‐Charles Michel, Claire Chenu, Nathalie Frascaria‐Lacoste, Christine Aubry · Kobra (Universitätsbibliothek Kassel) · France (Paris)

A 2012 pilot experiment in Paris, France, tested simple rooftop gardening systems using local urban organic waste as crop substrates. Measurements of production levels and heavy metal content in crops and substrates showed high crop production with limited inputs, low heavy metal pollutants in edible parts, and positive yield influence from layered substrates and earthworm inoculation. These results suggest rooftop gardening is feasible and has potential for urban resiliency, though further assessment of roof types, pollution levels, and sustainability is needed.

Klaus Lorenz · Soil Science · Global

Urban agriculture (UA) engages approximately 800 million people globally and covers over 67 million hectares of urban cropland. While UA contributes to food security, growing food in urban ecosystems, particularly on degraded urban soils, presents challenges. Past research on UA has focused on social sciences, and although studies on urban soils have increased, many urban areas remain neglected. Further research and dissemination of knowledge are needed on how to maintain or enhance urban soil fertility through soil and land-use management practices.

Tovonarivo Rafolisy, Heriniaina Ramahefarison, Dominique Massé · · Madagascar (Mahajanga)

Two experiments in Mahajanga, Madagascar, compared municipal solid waste (MSW) composts with conventional organic inputs (poultry or pig manure) in leaf cropping systems over two three-month seasons. MSW composts resulted in yields higher than pig manure and urea, and similar to poultry manure. However, monitoring soil mineral nitrogen levels revealed significant accumulation under certain conditions, indicating a possible source of environmental pollution by nitrates.

Luciene Rodrigues, Maria Antônia Carniello · Cadernos de Agroecologia · Brazil

This study aimed to document the use and agricultural management practices of tuberous plants by residents in urban backyards in Cáceres, Mato Grosso, Brazil, using semi-structured interviews. Nine species were recorded, including Manihot esculenta, with carrot, sweet potato, ginger, and saffron cited for medicinal use (8.3% to 16.6%). Planting followed seasons and lunar phases, and soil fertility was corrected with organic fertilizer and sawdust.