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Improving soil health through nature-based solutions: the effects of olive-pomace-based composts

2025Conference object Open access
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datacite.subject.fosCiências Agrárias::Agricultura, Silvicultura e Pescas
datacite.subject.fosCiências Naturais::Ciências da Terra e do Ambiente
datacite.subject.sdg12:Produção e Consumo Sustentáveis
datacite.subject.sdg15:Proteger a Vida Terrestre
dc.contributor.authorRoyer, Ana Caroline
dc.contributor.authorLado, Marcos
dc.contributor.authorFonseca, Felícia
dc.contributor.authorHernandez Hernandez, Zulimar
dc.contributor.authorFigueiredo, Tomás d'Aquino
dc.contributor.editorde la Rosa Arranz
dc.date.accessioned2025-10-08T15:33:29Z
dc.date.available2025-10-08T15:33:29Z
dc.date.issued2025
dc.description.abstractLoss of soil organic matter (SOM) is a major issue in Mediterranean regions, especially in NE Portugal, where about 70% of soils are classified as Leptosols. On the other hand, olive groves dominate the region's farmland, and the olive oil industry generates large quantities of by-products. Two-phase olive pomace (OP) has a high organic load and is phytotoxic due to its high phenolic content. Composting OP with other agri-residues offers a nature-based solution that addresses untreated OP disposal challenges while recycling nutrients and supporting the circular economy. This study evaluates the effects of olive pomace-based composts (OPC) on soil physical and chemical properties. OPC was produced by composting OP with sheep manure and almond shells. In a pot trial, 3 OPCs produced with different %OP (OPC44, OPC31 and OPC25) and a commercial organic corrective (HMC) were incorporated in the 0-5cm layer of an eutric Leptosol (2.1% OM) at three doses (10, 20, 40 t.ha-1) + control. Pots were seeded with Italian ryegrass (Lolium multiflorum) and watered to keep soil moisture above 70% field capacity. After 138 days trial, soil properties were analysed for SOM and its physical fractionation, total C and N, extractable K, P Olsen, pH, effective cation exchange capacity (CEC), bulk density, porosity, field capacity, and aggregate stability. Multivariate analysis showed that compost dose had a stronger influence on soil properties than compost type. Linear regression revealed that SOM, total C, extractable K, pH and effective CEC increased proportionally with dose. The highest dose led to SOM and total C increases of 13.3 and 8.4 g·kg⁻¹, respectively. Compared to HMC, OPCs were better K sources. Organic amendment decreased bulk density (by 8-15%) and increased soil porosity, field capacity, and improved aggregate stability by ~20% (particularly with OPC31 and OPC44). OPC application also enhanced both physical and chemical protection of SOM. C content was highest in macroaggregates, stored as unprotected and coarse particulate OM. Higher doses — especially of OPC31 and OPC44 — promoted larger C accumulation in strongly physically and chemically protected pools, as compared to control and HMC. OPCs application increased mineral-associated OM, likely due to their colloidal nature, supporting long-term SOM stabilization. This study highlights the potential of OPC to improve SOM content, fertility, and soil structure in degraded Mediterranean soils. Composting OP provides a sustainable approach to valorise agri-waste, enhance soil functions, and support climate-smart agriculture.eng
dc.description.sponsorshipPortuguese Foundation for Science and Technology (FCT, PT): FCT/MCTES (PIDDAC) to CIMO (UIDB/00690/2020 and UIDP/00690/2020) and SusTEC (LAIP/0007/2020). CICA, CIGUS Network, FEDER Galicia 2021-27 operational program (Ref. ED431 G 2023/09). A. C. Royer acknowledges FCT individual research grant 2022.11 024.BD.
dc.identifier.citationRoyer, Ana Caroline; Lado, Marcos; Fonseca, Felícia; Hernandez Hernandez, Zulimar; Figueiredo, Tomás d'Aquino (2025). Improving soil health through nature-based solutions: the effects of olive-pomace-based composts. In Advancing Soil Knowledge for a Sustainable Future - EUROSOIL 2025: Book of Abstracts. Sevilla. ISBN 978-84-09-75471-7
dc.identifier.isbn978-84-09-75471-7
dc.identifier.urihttp://hdl.handle.net/10198/34803
dc.language.isoeng
dc.peerreviewedyes
dc.publisherDigital.CSIC
dc.relationAssociate Laboratory for Sustainability and Tecnology in Mountain Regions
dc.relationMountain Research Center
dc.relationMountain Research Center
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectOlive groves
dc.titleImproving soil health through nature-based solutions: the effects of olive-pomace-based compostspor
dc.typeconference object
dspace.entity.typePublication
oaire.awardTitleAssociate Laboratory for Sustainability and Tecnology in Mountain Regions
oaire.awardTitleMountain Research Center
oaire.awardTitleMountain Research Center
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0007%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00690%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00690%2F2020/PT
oaire.citation.conferenceDate2025
oaire.citation.conferencePlaceSevilla
oaire.citation.endPage679
oaire.citation.startPage679
oaire.citation.titleAdvancing Soil Knowledge for a Sustainable Future – EUROSOIL 2025 Book of Abstracts”
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameRoyer
person.familyNameFonseca
person.familyNameHernandez Hernandez
person.familyNameFigueiredo
person.givenNameAna Caroline
person.givenNameFelícia
person.givenNameZulimar
person.givenNameTomás d'Aquino
person.identifier1297327
person.identifier.ciencia-id721A-9374-4C35
person.identifier.ciencia-id5815-8F1B-70F4
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person.identifier.orcid0000-0002-0746-185X
person.identifier.orcid0000-0001-7727-071X
person.identifier.orcid0000-0002-7790-8397
person.identifier.orcid0000-0001-7690-8996
person.identifier.scopus-author-id36970960500
person.identifier.scopus-author-id36084226300
person.identifier.scopus-author-id54790554500
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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