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
cg.authorship.typesCGIAR single centreen
cg.authorship.typesCGIAR and advanced research instituteen
cg.contributor.affiliationInternational Food Policy Research Instituteen
cg.contributor.affiliationInternational Finance Corporationen
cg.contributor.affiliationInternational Institute of Tropical Agricultureen
cg.contributor.donorCGIAR Trust Funden
cg.contributor.initiativeSeed Equal
cg.contributor.initiativePlant Health
cg.contributor.programAcceleratorBreeding for Tomorrow and Genebanks
cg.coverage.countryNigeria
cg.coverage.iso3166-alpha2NG
cg.coverage.regionAfrica
cg.coverage.regionWestern Africa
cg.coverage.regionSub-Saharan Africa
cg.creator.identifierHiroyuki Takeshima: 0000-0002-1761-408X
cg.creator.identifierCatherine Ragasa: 0000-0002-8033-0784
cg.creator.identifierTemilolu Bamiwuye: 0009-0009-5876-9895
cg.creator.identifierKwaw Andam: 0000-0002-4138-1693
cg.creator.identifierDavid J. Spielman: 0000-0002-6889-7358
cg.creator.identifierHyacinth Edeh: 0000-0003-0560-3604
cg.creator.identifierAdetunji Fasoranti: 0000-0001-8259-7186
cg.creator.identifierBeliyou Haile: 0000-0003-4949-6740
cg.creator.identifierChibuzo Nwagboso: 0000-0002-1669-8816
cg.creator.identifierTahirou Abdoulaye: 0000-0002-8072-1363
cg.creator.identifierP. Lava Kumar: 0000-0003-4388-6510
cg.creator.identifierTesfamicheal Wossen: 0000-0003-3793-7078
cg.howPublishedFormally Publisheden
cg.identifier.doihttps://doi.org/10.1016/j.agsy.2025.104268en
cg.identifier.projectIFPRI - Development Strategies and Governance Unit
cg.identifier.projectIFPRI - Innovation Policy and Scaling Unit
cg.identifier.publicationRankA
cg.isijournalISI Journalen
cg.issn0308-521Xen
cg.issueMarch 2025en
cg.journalAgricultural Systemsen
cg.reviewStatusPeer Reviewen
cg.subject.impactAreaEnvironmental health and biodiversity
cg.subject.impactAreaNutrition, health and food security
cg.volume224en
dc.contributor.authorTakeshima, Hiroyukien
dc.contributor.authorRagasa, Catherineen
dc.contributor.authorBamiwuye, Temiloluen
dc.contributor.authorAndam, Kwaw S.en
dc.contributor.authorSpielman, David J.en
dc.contributor.authorEdeh, Hyacinth O.en
dc.contributor.authorFasoranti, Adetunjien
dc.contributor.authorHaile, Beliyouen
dc.contributor.authorNwagboso, Chibuzoen
dc.contributor.authorOmoigui, Lucky O.en
dc.contributor.authorAbdoulaye, Tahirouen
dc.contributor.authorKumar, P. Lavaen
dc.contributor.authorWossen, Tesfamichealen
dc.date.accessioned2025-02-06T13:36:43Zen
dc.date.available2025-02-06T13:36:43Zen
dc.identifier.urihttps://hdl.handle.net/10568/172862
dc.titleSeed certification, certified seeds use and yield outcomes in Nigeria: Insights from nationally-representative farm panel data and seed company location dataen
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
dcterms.accessRightsOpen Access
dcterms.audienceAcademicsen
dcterms.available2025-02-04
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
dcterms.extent104268en
dcterms.issued2025-03
dcterms.languageen
dcterms.licenseCC-BY-4.0
dcterms.publisherElsevieren
dcterms.relationhttps://doi.org/10.2499/p15738coll2.136474en
dcterms.relationhttps://doi.org/10.2499/p15738coll2.137014en
dcterms.relationhttps://www.cgiar.org/news-events/news/optimizing-seed-certification-can-boost-sustainable-agriculture-the-case-of-nigeria/en
dcterms.replaceshttps://hdl.handle.net/10568/173245en
dcterms.subjectseed certificationen
dcterms.subjectseedsen
dcterms.subjectyieldsen
dcterms.subjectdataen
dcterms.subjectagricultural productivityen
dcterms.subjectspatial dataen
dcterms.subjectsurveysen
dcterms.typeJournal Article

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