Maize-grain zinc and iron concentrations as influenced by agronomic management and biophysical factors: a meta-analysis

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cg.authorship.typesCGIAR and developing country instituteen_US
cg.contributor.affiliationInternational Center for Tropical Agricultureen_US
cg.contributor.affiliationInternational Rice Research Instituteen_US
cg.contributor.affiliationInternational Center for Agricultural Research in the Dry Areasen_US
cg.contributor.affiliationAfrica Rice Centeren_US
cg.contributor.affiliationAddis Ababa Universityen_US
cg.contributor.donorBill & Melinda Gates Foundationen_US
cg.contributor.donorCGIAR Trust Funden_US
cg.contributor.initiativeExcellence in Agronomyen_US
cg.creator.identifierJob Kihara: 0000-0002-4394-9553en_US
cg.creator.identifierPeter BOLO: 0000-0002-4202-7557en_US
cg.creator.identifierDominic Mutambu: 0000-0002-5394-5230en_US
cg.creator.identifierAndrew Sila: 0000-0002-3991-8770en_US
cg.identifier.doihttps://doi.org/10.1007/s12571-024-01478-5en_US
cg.isijournalISI Journalen_US
cg.issn1876-4517en_US
cg.issue5en_US
cg.journalFood Securityen_US
cg.reviewStatusPeer Reviewen_US
cg.subject.actionAreaResilient Agrifood Systemsen_US
cg.subject.alliancebiovciatAGRICULTUREen_US
cg.subject.alliancebiovciatBIOFORTIFICATIONen_US
cg.subject.alliancebiovciatCROP PRODUCTIONen_US
cg.subject.alliancebiovciatFOOD SECURITYen_US
cg.volume16en_US
dc.contributor.authorKihara, Joben_US
dc.contributor.authorSileshi, Gudeta W.en_US
dc.contributor.authorBolo, Peteren_US
dc.contributor.authorMutambu, Dominicen_US
dc.contributor.authorSenthilkumar, Kalimuthuen_US
dc.contributor.authorSila, Andrewen_US
dc.contributor.authorDevkota, Minaen_US
dc.contributor.authorSaito, Kazukien_US
dc.date.accessioned2024-08-28T13:40:21Zen_US
dc.date.available2024-08-28T13:40:21Zen_US
dc.identifier.urihttps://hdl.handle.net/10568/151889en_US
dc.titleMaize-grain zinc and iron concentrations as influenced by agronomic management and biophysical factors: a meta-analysisen_US
dcterms.abstractHuman Zn and Fe deficiencies can be reduced through agronomic biofortification, but information on factors influencing maize grain-Zn and -Fe levels remain scanty. This analysis: (1) Establishes the global distribution of Zn and Fe concentrations in maize grain; (2) assess the contribution of different agronomic practices to the effectiveness of Zn fertilizers for increasing grain yields, and Zn and Fe levels in maize grain; and (3) identify key biophysical factors and metrics to more effectively guide agronomic biofortification of Zn. Using 5874 data points in 138 published papers from 34 countries, we estimated a 7.5% probability of grain-Zn concentrations exceeding the benchmark target of 38 mg kg −1 . Using 3187 data points from 65 studies across 27 countries we estimated a 8.5% probability of grain-Fe concentrations exceeding the target of 60 mg kg −1 . Our 70-paper meta-analysis revealed that applying Zn and/or Fe in combination with inorganic NPK fertilizer can increase maize-grain-Zn and-Fe concentrations by 31% ( p < 0.01) relative to the control (NPK only). In 52% and 37.5% of the studies respectively, grain-Zn and -Fe levels showed significant and concomitant increase with grain-yield increases. Soil organic matter, pH, soil-available Zn, organic input applications, and N, Zn and Fe application rates and methods were among the key factors influencing grain Zn and Fe. We conclude there is substantial room for increasing maize-grain Zn and Fe concentrations, and applying Zn, especially in combined soil and foliar applications, gives substantial increases in grain-Zn and -Fe concentrations. This global review reveals large data gaps on maize-grain nutrient levels, and we call for routine collection of such information in future research.en_US
dcterms.accessRightsOpen Accessen_US
dcterms.available2024-08-05en_US
dcterms.bibliographicCitationKihara, J.; Sileshi, G.W.; Bolo, P.; Mutambu, D.; Senthilkumar, K.; Sila, A.; Devkota, M.; Saito, K. (2024) Maize-grain zinc and iron concentrations as influenced by agronomic management and biophysical factors: a meta-analysis. Food Security, Online first paper (2024-08-05). ISSN: 1876-4517en_US
dcterms.extentpp. 1147-1173en_US
dcterms.issued2024-08-05en_US
dcterms.languageenen_US
dcterms.licenseCC-BY-4.0en_US
dcterms.publisherSpringer Science+Business Mediaen_US
dcterms.replaceshttps://hdl.handle.net/10568/162971en_US
dcterms.subjectbiofortificationen_US
dcterms.subjectzincen_US
dcterms.subjectnutrition securityen_US
dcterms.subjectironen_US
dcterms.subjectmeta-analysisen_US
dcterms.typeJournal Articleen_US

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