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dc.contributorBala, A.en_US
dc.contributorFranke, A. C.en_US
dc.contributorHeerwaarden, J. Vanen_US
dc.contributorGiller, Kenen_US
dc.contributorDiandi, Mahamadien_US
dc.contributorEdeh, E.en_US
dc.contributorUkem, B.en_US
dc.contributorVanlauwe, Bernarden_US
dc.creatorRonner, E.en_US
dc.identifier.citationE. Ronner, A. Bala, A. C. Franke, J. Van Heerwaarden, Ken Giller, Mahamadi Diandi, E. Edeh, B. Ukem, Bernard Vanlauwe. (Accepted on 3/6/2016). Understanding variability in soybean yield and response to P-fertilizer and rhizobium inoculants on farmers' fields in northern Nigeria. Field Crops Research.en_US
dc.description.abstractSoybean yields could benefit from the use of improved varieties, phosphate-fertilizer and rhizobium inoculants. In this study, we evaluated the results of widespread testing of promiscuous soybean varieties with four treatments: no inputs (control); SSP fertilizer (P); inoculants (I) and SSP plus inoculants (P + I) among smallholder farmers in northern Nigeria in 2011 and 2012. We observed a strong response to both P and I, which significantly increased grain yields by 452 and 447 kg ha−1 respectively. The additive effect of P + I (777 kg ha−1) resulted in the best average yields. Variability in yield among farms was large, which had implications for the benefits for individual farmers. Moreover, although the yield response to P and I was similar, I was more profitable due to its low cost. Only 16% of the variability in control yields could be explained by plant establishment, days to first weeding, percentage sand and soil exchangeable magnesium. Between 42% and 61% of variability in response to P and/or I could be explained by variables including year, farm size, plant establishment, total rainfall and pH. The predictive value of these variables was limited, however, with cross-validation R2 decreasing to about 15% for the prediction between Local Government Areas and 10% between years. Implications for future research include our conclusion that averages of performance of technologies tell little about the adoption potential for individual farmers. We also conclude that a strong agronomic and economic case exists for the use of inoculants with promiscuous soybean, requiring efforts to improve the availability of good quality inoculants in Africa.en_US
dc.sourceField Crops Research;en_US
dc.titleUnderstanding variability in soybean yield and response to P-fertilizer and rhizobium inoculants on farmers' fields in northern Nigeriaen_US
dc.typeJournal Articleen_US
cg.creator.idBala, A.: 0000-0003-1361-1786en_US
cg.creator.idGiller, Ken: 0000-0002-5998-4652en_US
cg.creator.idDiandi, Mahamadi: 0000-0002-6592-7443en_US
cg.creator.idVanlauwe, Bernard: 0000-0001-6016-6027en_US
cg.subject.agrovocsustainable intensificationen_US
cg.subject.agrovocwest africaen_US
cg.subject.agrovocsmallholder farmersen_US
cg.subject.agrovocsoya beanen_US
cg.contributor.centerInternational Institute of Tropical Agriculture - IITAen_US
cg.contributor.centerWageningen University & Research Centre - WURen_US
cg.contributor.centerFederal University of Technologyen_US
cg.contributor.crpCGIAR Research Program on Grain Legumes - GLen_US
cg.contributor.funderNot Applicableen_US
cg.contributor.project-lead-instituteWageningen University & Research Centre - WURen_US
cg.coverage.regionWestern Africaen_US
cg.coverage.regionSouthern Asiaen_US
cg.coverage.regionEastern Africaen_US
cg.isijournalISI Journalen_US
dc.identifier.statusOpen accessen_US
cg.journalField Crops Researchen_US

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