Immobilisation of anaerobic digestate supplied nitrogen into soil microbial biomass is dependent on lability of high organic carbon materials additives

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dc.contributor.authorvan Midden, Christina
dc.contributor.authorHarris, Jim A.
dc.contributor.authorShaw, Liz
dc.contributor.authorSizmur, Tom
dc.contributor.authorMorgan, Hayden
dc.contributor.authorPawlett, Mark
dc.date.accessioned2024-04-10T09:12:12Z
dc.date.available2024-04-10T09:12:12Z
dc.date.issued2024-03-22
dc.description.abstractAnaerobic digestate is a nutrient rich slurry by-product derived from biogas production, often used as a fertiliser due to its high nitrogen content. However, nitrogen losses from its application can lead to environmental pollution. In a laboratory experiment, the addition of high organic carbon materials to digestate-amended soil as a potential means to stimulate microbial immobilisation of digestate supplied nitrogen was investigated. Soil was incubated in pots for 5 months with digestate (equivalent to 250 kgN ha−1). The impact of adding carbon into the digestate (equivalent to 540 kgC ha−1) as either glycerol, straw, woodchip, or biochar on soil microbial and chemical parameters was quantified. Glycerol amended soils had significantly higher microbial biomass compared to digestate alone during the first month and at 30 days after application had a 4x higher on average microbial N. The digestate + straw treatment resulted in a 2.5x significantly greater nitrogen immobilisation compared to digestate alone after 3 months of incubation. The digestate + woodchip had a 2× higher mean microbial N after 5 months, whilst the biochar amendment did not stimulate significant nitrogen immobilisation at any time. These results suggest that mixing a labile to moderately labile organic carbon amendment, such as straw, with digestate has the greatest potential to reduce nitrogen losses following digestate application through microbial immobilisation.en_UK
dc.description.sponsorshipThis research was funded by UKRI BBSRC FoodBioSystems Doctoral Training Partnership (DTP), grant number BB/T008776/1 and Future Biogas Ltd.en_UK
dc.identifier.citationvan Midden C, Harris J, Shaw L, et al., (2024) Immobilisation of anaerobic digestate supplied nitrogen into soil microbial biomass is dependent on lability of high organic carbon materials additives. Frontiers in Sustainable Food Systems, Volume 8, March 2024, Article Number 1356469.en_UK
dc.identifier.eissn2571-581X
dc.identifier.urihttps://doi.org/10.3389/fsufs.2024.1356469
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/21172
dc.language.isoen_UKen_UK
dc.publisherFrontiersen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectbiogas residueen_UK
dc.subjectnitrogen immobilisationen_UK
dc.subjectmicrobial communityen_UK
dc.subjectglycerolen_UK
dc.subjectstrawen_UK
dc.subjectwoodchipen_UK
dc.subjectbiocharen_UK
dc.titleImmobilisation of anaerobic digestate supplied nitrogen into soil microbial biomass is dependent on lability of high organic carbon materials additivesen_UK
dc.typeArticleen_UK
dcterms.dateAccepted2024-03-04

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