Dittrich, Christian; Pecenka, Ralf; Løes, Anne-Kristin; Caceres, Rafaela; Conroy, Judith; Rayns, Francis; Schmutz, Ulrich; Kir, Alev and Kruggel-Emden, Harald (2021) Extrusion of Different Plants into Fibre for Peat Replacement in Growing Media: Adjustment of Parameters to Achieve Satisfactory Physical Fibre-Properties. Agronomy MDPI, 11 (6), p. 1185.
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Summary
Peat is a highly contentious input in agriculture. Replacing or reducing peat by substitution with lignocellulosic biomass processed into fibre by twin-screw-extrusion could contribute to more sustainable agriculture with regard to horticultural production. Therefore, plant wastes including pruning from Olea europaea L. and Vitis spp. L., residues from perennial herbs like Salvia spp. L., Populus spp. L. and forest biomass were processed to fibre for peat replacement with a biomass extruder. The water-holding-capacity (WHC), particle-size-distribution and other physical fibre characteristics were determined and compared to peat. The specific energy demand during extrusion was measured for aperture settings from 6–40 mm. No fibre reached the 82% WHC of peat. At the setting of 20 mm of all materials investigated, Salvia performed best with a WHC of 53% and moderate specific energy demand (167 kWh tDM−1) followed by Olea europaea with a WHC of 43% and a low energy demand (93 kWh tDM−1). For Populus, opening the aperture from 20–40 mm decreased energy demand by 41% and WHC by 27%. The drying of biomass for storage and remoistening during extrusion increased the specific energy demand. Despite a lower WHC than peat, all investigated materials are suitable to replace peat in growing media regarding their physical properties.
EPrint Type: | Journal paper |
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Keywords: | twin-screw extrusion; fibre; agricultural residues; peat substitution; specific energy demand; water holding capacity; Organic-PLUS |
Agrovoc keywords: | Language Value URI English growing media http://aims.fao.org/aos/agrovoc/c_3393 English wood material UNSPECIFIED English extrusion http://aims.fao.org/aos/agrovoc/c_2769 |
Subjects: | Food systems > Recycling, balancing and resource management |
Research affiliation: | European Union > Horizon 2020 > Organic-PLUS |
Horizon Europe or H2020 Grant Agreement Number: | 774340 |
DOI: | 10.3390/agronomy11061185 |
Related Links: | https://organic-plus.net/, https://www.norsok.no/en/projects/2018/pathways-to-phase-out-contentious-inputs-from-organic-agriculture-in-europe-organic-plus |
Deposited By: | Løes, Anne-Kristin |
ID Code: | 43612 |
Deposited On: | 18 Feb 2022 12:20 |
Last Modified: | 18 Feb 2022 12:20 |
Document Language: | English |
Status: | Published |
Refereed: | Peer-reviewed and accepted |
Additional Publishing Information: | This article belongs to the Special Issue "Advances in Soilless Substrate Science for Modern Plant Production Systems" |
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