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Unbalanced nutrient ratios in pelleted compound recycling fertilizers
NIBIO, Norwegian Institute of Bioeconomy Research, Norway.
RISE - Research Institutes of Sweden, Bioeconomy, PFI.
NIBIO, Norwegian Institute of Bioeconomy Research, , Norway.
Norwegian University of Life Sciences, Norway.
2018 (English)In: Soil use and management, ISSN 0266-0032, E-ISSN 1475-2743, Vol. 34, no 1, p. 18-27Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to contribute to the development of pelleted compound recycling fertilizers with favourable handling and spreading characteristics and balanced nutrient ratios by combining nitrogen (N)- and phosphorus (P)-rich waste resources (meat bone meal, fish sludge or food waste) with potassium (K)-rich bottom wood ash. Pelleted compound recycling fertilizers with good durability and low dusting tendency were produced by roll-pelleting preheated waste resources at a suitable moisture content. However, the nutrient ratios in the final products were insufficiently balanced, with too low N concentrations relative to P and K to meet crop demands. In a bioassay using barley (Hordeum vulgare) and a nutrient-deficient sand/peat mixture, the relative agronomic effectiveness (RAE) of pelleted compound recycling fertilizers and reference recycling fertilizers was 22-42% of that of mineral compound fertilizer. Growth limitation was due to reduced N availability (mineral fertilizer equivalent - MFE=35-57%) or reduced P availability (MFE=20-115%), with the greatest P fertilizer value obtained for digestate based on dairy manure and fish sludge. Availability of K in bottom wood ash was masked by the experimental soil.

Place, publisher, year, edition, pages
2018. Vol. 34, no 1, p. 18-27
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Natural Sciences
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URN: urn:nbn:se:ri:diva-33706DOI: 10.1111/sum.12407OAI: oai:DiVA.org:ri-33706DiVA, id: diva2:1197818
Available from: 2018-04-14 Created: 2018-04-14 Last updated: 2018-04-27Bibliographically approved

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