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dc.contributor.authorThuita, M.
dc.contributor.authorVanlauwe, Bernard
dc.contributor.authorMutegi, E.
dc.contributor.authorMasso, C.
dc.date.accessioned2019-12-04T11:14:17Z
dc.date.available2019-12-04T11:14:17Z
dc.date.issued2018
dc.identifier.citationThuita, M., Vanlauwe, B., Mutegi, E. & Masso, C. (2018). Reducing spatial variability of soybean response to rhizobia inoculants in farms of variable soil fertility in Siaya County of western Kenya. Agriculture, Ecosystems & Environment, 261,153-160.
dc.identifier.issn0167-8809
dc.identifier.urihttps://hdl.handle.net/20.500.12478/2716
dc.descriptionArticle purchased; Published online: 09 Jan 2018
dc.description.abstractSoybean grain yields in sub-Saharan Africa have remained at approximately 50% below those attained in South America despite numerous efforts. A study was conducted in Siaya County (western Kenya) involving 107 farms with soils of different fertility status. The main objective was to test combinations of two inoculants (Legumefix and Biofix) and nutrient sources (Minjingu and Sympal) to raise soybean grain yields. Inoculation used Legumefix or Biofix with and without Minjingu or Sympal in a factorial design. There was soil acidity and a widespread deficiency of potassium, nitrogen, and phosphorus. Inoculation and nutrient source led to increases in nodulation and nodule occupancy. For grain yields the response varied from nil in some sites to high increases in others. Highest grain yields (3000–4000 kg ha−1) were obtained with Legumefix + Sympal (12% of the farmers testing it). The formulation of the nutrient source was important to meet other nutrient deficiencies in most of the soils. Farmers using Legumefix + Sympal require yield increases of 35% for profitability (Value cost ratio of 3) while farmers using Minjingu + inoculant require a yield increase of at least 68%. Inoculants used alone were most profitable but this is advisable only when farmers are too resource constrained to afford fertilizer. For sustainable yields Legumefix + Sympal or Biofix + Sympal were recommended.
dc.description.sponsorshipBill & Melinda Gates Foundation
dc.description.sponsorshipConseil National de Recherche Scientifique, France
dc.format.extent153-160
dc.language.isoen
dc.subjectBiological Nitrogen Fixation
dc.subjectSoybeans
dc.subjectSoil Fertility
dc.subjectYield
dc.subjectSpatial Analysis
dc.subjectInoculants
dc.titleReducing spatial variability of soybean response to rhizobia inoculants in farms of variable soil fertility in Siaya County of western Kenya
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.crpGrain Legumes
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.coverage.regionAfrica
cg.coverage.regionWest Africa
cg.coverage.countryKenya
cg.creator.identifierMoses Thuita: 0000-0002-6731-9492
cg.creator.identifierbernard vanlauwe: 0000-0001-6016-6027
cg.creator.identifierCharity Mutegi: 0000-0002-3188-0480
cg.creator.identifierCargele Masso: 0000-0002-3980-6832
cg.isijournalISI Journal
cg.authorship.typesCGIAR single centre
cg.iitasubjectGrain Legumes
cg.iitasubjectPlant Production
cg.iitasubjectSoil Fertility
cg.iitasubjectSoybean
cg.journalAgriculture, Ecosystems & Environment
cg.howpublishedFormally Published
cg.accessibilitystatusOpen Access
local.dspaceid93677
cg.targetaudienceScientists
cg.identifier.doihttp://dx.doi.org/10.1016/j.agee.2018.01.007


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