Seed certification, certified seeds use and yield outcomes in Nigeria: Insights from nationally-representative farm panel data and seed company location data

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cg.authorship.typesCGIAR multi-centreen_US
cg.authorship.typesCGIAR single centreen_US
cg.authorship.typesCGIAR and advanced research instituteen_US
cg.contributor.affiliationInternational Food Policy Research Instituteen_US
cg.contributor.affiliationInternational Finance Corporationen_US
cg.contributor.affiliationInternational Institute of Tropical Agricultureen_US
cg.contributor.donorCGIAR Trust Funden_US
cg.contributor.initiativeSeed Equalen_US
cg.contributor.programAcceleratorBreeding for Tomorrow and Genebanksen_US
cg.coverage.countryNigeriaen_US
cg.coverage.regionAfricaen_US
cg.coverage.regionWestern Africaen_US
cg.coverage.regionSub-Saharan Africaen_US
cg.creator.identifierHiroyuki Takeshima: 0000-0002-1761-408Xen_US
cg.creator.identifierCatherine Ragasa: 0000-0002-8033-0784en_US
cg.creator.identifierTemilolu Bamiwuye: 0009-0009-5876-9895en_US
cg.creator.identifierKwaw Andam: 0000-0002-4138-1693en_US
cg.creator.identifierDavid J. Spielman: 0000-0002-6889-7358en_US
cg.creator.identifierHyacinth Edeh: 0000-0003-0560-3604en_US
cg.creator.identifierAdetunji Fasoranti: 0000-0001-8259-7186en_US
cg.creator.identifierBeliyou Haile: 0000-0003-4949-6740en_US
cg.creator.identifierChibuzo Nwagboso: 0000-0002-1669-8816
cg.creator.identifierP. Lava Kumar: 0000-0003-4388-6510en_US
cg.creator.identifierTesfamicheal Wossen: 0000-0003-3793-7078en_US
cg.howPublishedFormally Publisheden_US
cg.identifier.doihttps://doi.org/10.1016/j.agsy.2025.104268en_US
cg.identifier.projectIFPRI - Development Strategies and Governance Uniten_US
cg.identifier.projectIFPRI - Innovation Policy and Scaling Uniten_US
cg.identifier.publicationRankAen_US
cg.isijournalISI Journalen_US
cg.issn0308-521Xen_US
cg.issueMarch 2025en_US
cg.journalAgricultural Systemsen_US
cg.reviewStatusPeer Reviewen_US
cg.subject.impactAreaEnvironmental health and biodiversityen_US
cg.subject.impactAreaNutrition, health and food securityen_US
cg.volume224en_US
dc.contributor.authorTakeshima, Hiroyukien_US
dc.contributor.authorRagasa, Catherineen_US
dc.contributor.authorBamiwuye, Temiloluen_US
dc.contributor.authorAndam, Kwaw S.en_US
dc.contributor.authorSpielman, David J.en_US
dc.contributor.authorEdeh, Hyacinth O.en_US
dc.contributor.authorFasoranti, Adetunjien_US
dc.contributor.authorHaile, Beliyouen_US
dc.contributor.authorNwagboso, Chibuzoen_US
dc.contributor.authorOmoigui, Lucky O.en_US
dc.contributor.authorAbdoulaye, Tahirouen_US
dc.contributor.authorKumar, P. Lavaen_US
dc.contributor.authorWossen, Tesfamichealen_US
dc.date.accessioned2025-02-06T13:36:43Zen_US
dc.date.available2025-02-06T13:36:43Zen_US
dc.identifier.urihttps://hdl.handle.net/10568/172862en_US
dc.titleSeed certification, certified seeds use and yield outcomes in Nigeria: Insights from nationally-representative farm panel data and seed company location dataen_US
dcterms.abstractCONTEXT Despite the importance of enhanced seed quality to agricultural productivity growth, evidence remains scarce regarding the nature and possible drivers of returns to formal sector quality assurance systems, including certified seeds production in countries like Nigeria that focus significantly on the formal-sector seed systems. OBJECTIVE This study narrows this knowledge gap by estimating the effect of the quantity of certified seeds produced and the spatial variations where they are produced on the use of certified seeds and yields. We also assess the yield effects of certified seeds use and their relationship with agroclimatic and socioeconomic conditions. METHODS We combine nationally-representative farm-household survey panel data with spatial data on the headquarters locations of seed companies, the quantity of certified seeds for maize, cowpea, and rice that they produce, and spatially explicit agroecological data. We apply panel fixed effects methods as well as instrumental-variable methods to address potential endogeneity associated with certified seeds use while also controlling for the use of improved varieties to separate their effects from the effects of certified seeds. RESULTS AND CONCLUSIONS Our findings indicate that the availability of certified seeds—captured by indicators of certified seeds produced by seed companies headquartered in the states of survey respondents—is associated with positive but declining marginal effects on certified seeds use and yields. These results are robust when we also consider the potential within-state heterogeneity in the proximity to seed company headquarters, as well as potential spillovers from the nearest adjacent states. The yield effects of certified seeds are heterogeneous and depend on agroclimatic conditions and farmers' socioeconomic characteristics. The use of certified seeds is somewhat higher in areas with higher yield effects after controlling for certified seeds production. These patterns partly lead to observed non-linearities in certified seeds use because certified seeds may be more likely to be used by farmers with higher expected returns than farmers with lower expected returns. These results underscore the importance of spatially targeted efforts in enhancing certified seeds production capacity, together with the exploration of intermediate quality standards in the short term where costs of seed certification are high relative to returns. SIGNIFICANCE The study provides unique quantitative evidence in a nationally representative framework in an African country that returns to seed certification systems in the current setting significantly vary depending on contexts, including agroclimatic conditions.en_US
dcterms.accessRightsOpen Accessen_US
dcterms.audienceAcademicsen_US
dcterms.available2025-02-04en_US
dcterms.bibliographicCitationTakeshima, Hiroyuki; Ragasa, Catherine; Bamiwuye, Temilolu; Andam, Kwaw S.; Spielman, David J.; Edeh, Hyacinth O.; Fasoranti, Adetunji; Haile, Beliyou; et al. 2025. Seed certification, certified seeds use and yield outcomes in Nigeria: Insights from nationally-representative farm panel data and seed company location data. Agricultural Systems 224(March 2025): 104268. https://doi.org/10.1016/j.agsy.2025.104268en_US
dcterms.extent104268en_US
dcterms.issued2025-03en_US
dcterms.languageenen_US
dcterms.licenseCC-BY-4.0en_US
dcterms.publisherElsevieren_US
dcterms.relationhttps://doi.org/10.2499/p15738coll2.136474en_US
dcterms.relationhttps://doi.org/10.2499/p15738coll2.137014en_US
dcterms.relationhttps://www.cgiar.org/news-events/news/optimizing-seed-certification-can-boost-sustainable-agriculture-the-case-of-nigeria/en_US
dcterms.subjectseed certificationen_US
dcterms.subjectseedsen_US
dcterms.subjectyieldsen_US
dcterms.subjectdataen_US
dcterms.subjectagricultural productivityen_US
dcterms.subjectspatial dataen_US
dcterms.subjectsurveysen_US
dcterms.typeJournal Articleen_US

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