Løes, Anne-Kristin; Rittl, Tatiana; Eiter, Sebastian and Haraldsen, Trond K. (2023) Bynær dyrking med resirkulert gjødsel? En vurdering av tungmetallrisiko. Økologisk landbruk, December 2023 (3), pp. 40-43.
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Summary
Mange som dyrker grønnsaker til direkte salg er interessert i økologiske driftsmetoder. Det er mye organisk materiale tilgjengelig i byer og tettbygde strøk. Matrester og avfall fra hager og parker kan bli til både energi og gjødsel, som kan brukes i dyrking av grønnsaker i bynære strøk. Da får vi korte verdikjeder, men hva med innholdet av tungmetaller? Beregninger viser at grenseverdier i jord vil mettes først for kobber og sink, som også er viktige mikronæringsstoffer. for planter. Jordforbedringsmidler med høyt innhold av organisk materiale, som hage-park kompost og hestegjødsel, inneholder mer tungmetaller per kg tørrstoff enn fjørfegjødsel og utråtnet matavfall.
Summary translation
Vegetable growers producing for direct sales are often interested in organic farming methods. Significant amounts of organic materials are available in urban areas. Food residues and organic waste from recreational areas may be applied for energy production (anaerobic digestion) and as soil amendments, which may be used for local food production in (peri)urban areas. This may create short value chains, but what about the content of potentially toxic elements (PTEs), often called "heavy metals", in the soil? Assessments of Norwegian soil and organic soil amendments made from food and garden waste, plus poultry manure and horse manure which are often used as commercial fertilisers in (peri)urban settings, have shown that soil quality tresholds will first be achieved for zink and copper. These elements are essential micronutrients for crop plants. Soil amendments with high contents of organic matter, like composted garden waste and horse manure, have higher concentrations of PTEs per kg dry matter than poultry manure and digested food waste.
| EPrint Type: | Newspaper or magazine article |
|---|---|
| Keywords: | periurban growing, urbant landbruk, kompost, tungmetall, sink, kobber, kadmium, potentially toxic elements, URBANFARMS |
| Agrovoc keywords: | Language Value URI English urban agriculture http://aims.fao.org/aos/agrovoc/c_35707 English heavy metals http://aims.fao.org/aos/agrovoc/c_2223 |
| Subjects: | Soil > Soil quality Food systems > Food security, food quality and human health Values, standards and certification > Assessment of impacts and risks Values, standards and certification > Evaluation of inputs |
| Research affiliation: | Norway > NIBIO – Norwegian Institute of Bioeconomy Research Norway > NORSØK - Norwegian Centre for Organic Agriculture |
| Related Links: | https://www.nibio.no/en/projects/urbanfarms?locationfilter=true |
| Deposited By: | Løes, Anne-Kristin |
| ID Code: | 52192 |
| Deposited On: | 19 Dec 2023 08:35 |
| Last Modified: | 19 Dec 2023 08:35 |
| Document Language: | Norwegian/Norsk |
| Status: | Published |
| Refereed: | Not peer-reviewed |
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