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dc.contributor.authorHeerwaarden, Joost van
dc.contributor.authorBaijukya, Frederick P.
dc.contributor.authorKyei-Boahen, S.
dc.contributor.authorAdjei-Nsiah, Samuel
dc.contributor.authorEbanyat, Peter
dc.contributor.authorKamai, N.
dc.contributor.authorWoldemeskel, Endalkachew
dc.contributor.authorKanampiu, F.
dc.contributor.authorVanlauwe, Bernard
dc.contributor.authorGiller, Ken E.
dc.date.accessioned2019-12-04T11:10:28Z
dc.date.available2019-12-04T11:10:28Z
dc.date.issued2018
dc.identifier.citationvan Heerwaarden, J., Baijukya, F., Kyei-Boahen, S., Adjei-Nsiah, S., Ebanyat, P., Kamai, N., ... & Giller, K. (2018). Soyabean response to rhizobium inoculation across sub-Saharan Africa: patterns of variation and the role of promiscuity. Agriculture, Ecosystems & Environment, 261, 211-218.
dc.identifier.issn0167-8809
dc.identifier.urihttps://hdl.handle.net/20.500.12478/2155
dc.descriptionArticle purchased; Published online: 7 Sept 2017
dc.description.abstractImproving bacterial nitrogen fixation in grain legumes is central to sustainable intensification of agriculture in sub-Saharan Africa. In the case of soyabean, two main approaches have been pursued: first, promiscuous varieties were developed to form effective symbiosis with locally abundant nitrogen fixing bacteria. Second, inoculation with elite bacterial strains is being promoted. Analyses of the success of these approaches in tropical smallholder systems are scarce. It is unclear how current promiscuous and non-promiscuous soyabean varieties perform in inoculated and uninoculated fields, and the extent of variation in inoculation response across regions and environmental conditions remains to be determined. We present an analysis of on-farm yields and inoculation responses across ten countries in Sub Saharan Africa, including both promiscuous and non-promiscuous varieties. By combining data from a core set of replicated on-farm trials with that from a large number of farmer-managed try-outs, we study the potential for inoculation to increase yields in both variety types and evaluate the magnitude and variability of response. Average yields were estimated to be 1343 and 1227 kg/ha with and without inoculation respectively. Inoculation response varied widely between trials and locations, with no clear spatial patterns at larger scales and without evidence that this variation could be explained by yield constraints or environmental conditions. On average, specific varieties had similar uninoculated yields, while responding more strongly to inoculation. Side-by side comparisons revealed that stronger responses were observed at sites where promiscuous varieties had superior uninoculated yields, suggesting the availability of compatible, effective bacteria as a yield limiting factor and as a determinant of the magnitude of inoculation response.
dc.description.sponsorshipBill & Melinda Gates Foundation
dc.format.extent1-8
dc.language.isoen
dc.subjectBradyrhizobium
dc.subjectSoybeans
dc.subjectFarmers
dc.subjectSustainable Agriculture
dc.subjectIntensification
dc.subjectVarieties
dc.subjectGrain Legumes
dc.titleSoyabean response to rhizobium inoculation across sub-Saharan Africa: Patterns of variation and the role of promiscuity
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.crpGrain Legumes
cg.contributor.crpIntegrated Systems for the Humid Tropics
cg.contributor.crpWater, Land and Ecosystems
cg.contributor.affiliationWageningen University and Research Centre
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationInternational Livestock Research Institute
cg.coverage.regionAfrica
cg.coverage.regionCentral Africa
cg.coverage.regionEast Africa
cg.coverage.regionSouthern Africa
cg.coverage.regionWest Africa
cg.coverage.countryCongo, Dr
cg.coverage.countryEthiopia
cg.coverage.countryGhana
cg.coverage.countryKenya
cg.coverage.countryMalawi
cg.coverage.countryMozambique
cg.coverage.countryNigeria
cg.coverage.countryRwanda
cg.coverage.countryUganda
cg.coverage.countryZimbabwe
cg.isijournalISI Journal
cg.authorship.typesCGIAR and advanced research institute
cg.iitasubjectGrain Legumes
cg.iitasubjectSoybean
cg.journalAgriculture, Ecosystems & Environment
cg.howpublishedFormally Published
cg.accessibilitystatusOpen Access
local.dspaceid90798
cg.targetaudienceScientists
cg.identifier.doihttp://dx.doi.org/10.1016/j.agee.2017.08.016


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