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A Spray Foliar Containing Methylobacterium symbioticum Did Not Increase Nitrogen Concentration in Leaves or Olive Yield Across Three Rainfed Olive Orchards

2025Journal article Open access
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datacite.subject.fosCiências Agrárias::Agricultura, Silvicultura e Pescas
datacite.subject.sdg03:Saúde de Qualidade
dc.contributor.authorRodrigues, Manuel Ângelo
dc.contributor.authorLopes, João Ilídio
dc.contributor.authorMartins, Sandra
dc.contributor.authorBrito, Cátia
dc.contributor.authorCorreia, Carlos M.
dc.contributor.authorArrobas, Margarida
dc.contributor.authorRodrigues, Manuel Ângelo
dc.date.accessioned2025-04-07T15:41:05Z
dc.date.available2025-04-07T15:41:05Z
dc.date.issued2025
dc.description.abstractBiological nitrogen (N) fixation has been advocated in agricultural fields due to being considered a more sustainable way to introduce N into agrosystems than industrial N fertilizers. In this study, a foliar spray inoculant containing the microorganism Methylobacterium symbioticum was applied. This microorganism is known for fixing N in the phyllosphere, regardless of the cultivated species. This study was conducted in three rainfed olive orchards over three years. In two orchards managed according to European Union (EU) integrated production rules, the experiment was organized as a factorial design with inoculant (applied at two levels, yes and no) and N fertilization (applied to the soil at three levels, 0, 40, and 80 kg ha−1 of N). The third trial, managed according to EU organic farming rules, was organized in a completely randomized design with three treatments: with (yes) and without (no) inoculant and with a treatment involving a seaweed extract, also for foliar application. The microbiological inoculant did not consistently influence olive yield or N concentration in leaves across the three trials. Conversely, N application to the soil significantly influenced N concentration in leaves and olive yield. In one of the trials, in the third year of the study, soil N application (80 kg ha−1) resulted in an olive yield of ~eight times higher than the unfertilized control treatment. The seaweed extract also did not lead to significant differences in leaf mineral composition or olive yield compared with the other treatments. These findings from the on-farm research highlight the importance of accurately determining the conditions under which commercial products can deliver effective results. It is crucial to acknowledge that these products involve expenses not only in their acquisition but also in their application.eng
dc.description.sponsorshipThe authors are grateful to the Foundation for Science and Technology (FCT, Portugal) for financial support from national funds FCT/MCTES, to CIMO (UIDB/AGR/00690/2020), SusTEC (LA/P/0007/2020) and CITAB (UIDB/04033/2020)
dc.identifier.citationRodrigues, Manuel Ângelo; Lopes, João Ilídio; Martins, Sandra; Brito, Cátia; Correia, Carlos Manuel; Arrobas, Margarida (2025). A Spray Foliar Containing Methylobacterium symbioticum Did Not Increase Nitrogen Concentration in Leaves or Olive Yield Across Three Rainfed Olive Orchards. Horticulturae. ISSN 2311-7524. 11.1, p. 1-17
dc.identifier.doi10.3390/horticulturae11010080
dc.identifier.issn2311-7524
dc.identifier.urihttp://hdl.handle.net/10198/34406
dc.language.isoeng
dc.peerreviewedyes
dc.publisherMDPI
dc.relationAssociate Laboratory for Sustainability and Tecnology in Mountain Regions
dc.relationCentre for the Research and Technology of Agro-Environmental and Biological Sciences
dc.relation.ispartofHorticulturae
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectPlant biostimulant
dc.subjectOlea europaea
dc.subjectNitrogen fertilization
dc.subjectOrganic farming
dc.subjectIntegrated production
dc.subjectSeaweed extract
dc.subjectBiological nitrogen fixation
dc.titleA Spray Foliar Containing Methylobacterium symbioticum Did Not Increase Nitrogen Concentration in Leaves or Olive Yield Across Three Rainfed Olive Orchardseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAssociate Laboratory for Sustainability and Tecnology in Mountain Regions
oaire.awardTitleCentre for the Research and Technology of Agro-Environmental and Biological Sciences
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0007%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04033%2F2020/PT
oaire.citation.endPage17
oaire.citation.issue1
oaire.citation.startPage1
oaire.citation.titleHorticulturae
oaire.citation.volume11
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameArrobas
person.familyNameRodrigues
person.givenNameMargarida
person.givenNameManuel Ângelo
person.identifier.ciencia-id971C-B85B-1EC0
person.identifier.ciencia-id371D-DF0D-8D68
person.identifier.orcid0000-0002-4652-485X
person.identifier.orcid0000-0002-5367-1129
person.identifier.ridO-1721-2016
person.identifier.scopus-author-id8575728800
person.identifier.scopus-author-id35270106800
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
relation.isAuthorOfPublicationd057ae6b-331c-4980-967d-0ce4fe1bcf8a
relation.isAuthorOfPublication43621353-fa11-4559-9b24-27eba5ad3de0
relation.isAuthorOfPublication.latestForDiscoveryd057ae6b-331c-4980-967d-0ce4fe1bcf8a
relation.isProjectOfPublication6255046e-bc79-4b82-8884-8b52074b4384
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