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Legacy Effects of Intercropping and Nitrogen Fertilization on Soil N Cycling, Nitrous Oxide Emissions, and the Soil Microbial Community in Tropical Maize Production

dc.contributor.authorCanisares, Lucas P.
dc.contributor.authorPoffenbarger, Hanna
dc.contributor.authorBrodie, Eoin L.
dc.contributor.authorSorensen, Patrick O.
dc.contributor.authorKaraoz, Ulas
dc.contributor.authorVillegas, Daniel M.
dc.contributor.authorArango, Jacobo
dc.contributor.authorMomesso, Letusa [UNESP]
dc.contributor.authorCrusciol, Carlos Alexandre Costa [UNESP]
dc.contributor.authorCantarella, Heitor
dc.contributor.institutionAgronomic Institute of Campinas
dc.contributor.institutionUniversity of Kentucky
dc.contributor.institutionLawrence Berkeley National Laboratory
dc.contributor.institutionBerkeley
dc.contributor.institutionInternational Center for Tropical Agriculture (CIAT)
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2025-04-29T20:05:52Z
dc.date.issued2021-01-01
dc.description.abstractMaize-forage grasses intercropping systems have been increasingly adopted by farmers because of their capacity to recycle nutrients, provide mulch, and add C to soil. However, grasses have been shown to increase nitrous oxide (N2O) emissions. Some tropical grasses cause biological nitrification inhibition (BNI) which could mitigate N2O emissions in the maize cycle but the reactions of the N cycle and the microbial changes that explain the N2O emissions are little known in such intercropping systems. With this in mind, we explored intercropping of forage grasses (Brachiaria brizantha and Brachiaria humidicola) with distinct BNI and yield potential to increase N cycling in no-till maize production systems compared to monocrop with two N rates (0 and 150 kg ha−1) applied during the maize season. These grasses did not strongly compete with maize during the period of maize cycle and did not have a negative effect on grain yield. We observed a legacy of these grasses on N mineralization and nitrification through the soil microbiome during maize growth. We observed that B. humidicola, genotype with higher BNI potential, increased net N mineralization by 0.4 mg N kg−1 day−1 and potential nitrification rates by 1.86 mg NO3-N kg−1 day−1, while B. brizantha increased the soil moisture, fungi diversity, mycorrhizal fungi, and bacterial nitrifiers, and reduced saprotrophs prior to maize growth. Their legacy on soil moisture and cumulative organic inputs (i.e., grass biomass) was strongly associated with enhanced mineralization and nitrification rates at early maize season. These effects contributed to increase cumulative N2O emission by 12.8 and 4.8 mg N2O-N m−2 for maize growing after B. brizantha and B. humidicola, respectively, regardless of the N fertilization rate. Thus, the nitrification inhibition potential of tropical grasses can be outweighed by their impacts on soil moisture, N recycling, and the soil microbiome that together dictate soil N2O fluxes.en
dc.description.affiliationSoils and Environmental Resources Center Agronomic Institute of Campinas
dc.description.affiliationDepartment of Plant and Soil Sciences University of Kentucky
dc.description.affiliationEarth and Environmental Sciences Area Lawrence Berkeley National Laboratory
dc.description.affiliationDepartment of Environmental Science Policy and Management University of California Berkeley
dc.description.affiliationInternational Center for Tropical Agriculture (CIAT)
dc.description.affiliationCollege of Agricultural Sciences São Paulo State University
dc.description.affiliationUnespCollege of Agricultural Sciences São Paulo State University
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipCenter for Information Technology
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCenter for Scientific Review
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de Goiás
dc.description.sponsorshipFundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipLawrence Berkeley National Laboratory
dc.description.sponsorshipNational Institutes of Health
dc.description.sponsorshipOffice of Extramural Research, National Institutes of Health
dc.description.sponsorshipOffice of Research Infrastructure Programs, National Institutes of Health
dc.description.sponsorshipNewton Fund
dc.identifierhttp://dx.doi.org/10.3389/fsoil.2021.746433
dc.identifier.citationFrontiers in Soil Science, v. 1.
dc.identifier.doi10.3389/fsoil.2021.746433
dc.identifier.issn2673-8619
dc.identifier.scopus2-s2.0-85124557353
dc.identifier.urihttps://hdl.handle.net/11449/306312
dc.language.isoeng
dc.relation.ispartofFrontiers in Soil Science
dc.sourceScopus
dc.subjectintercropping
dc.subjectmicrobial community
dc.subjectmineralization
dc.subjectnitrification
dc.subjectnitrous oxide-N2O
dc.titleLegacy Effects of Intercropping and Nitrogen Fertilization on Soil N Cycling, Nitrous Oxide Emissions, and the Soil Microbial Community in Tropical Maize Productionen
dc.typeArtigopt
dspace.entity.typePublication

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