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dc.contributorVanlauwe, Bernarden_US
dc.contributorMutegi, E.en_US
dc.contributorMasso, Cargeleen_US
dc.creatorMoses, Thuitaen_US
dc.identifier.citationThuita Moses, Bernard Vanlauwe, E. Mutegi, Cargele Masso. (1/1/2018). Reducing spatial variability of soybean response to rhizobia inoculants in farms of variable soil fertility in Siaya County of western Kenya. Agriculture, Ecosystems and Environment.en_US
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.en_US
dc.publisherElsevier Massonen_US
dc.sourceAgriculture, Ecosystems and Environment;(2018)en_US
dc.titleReducing spatial variability of soybean response to rhizobia inoculants in farms of variable soil fertility in Siaya County of western Kenyaen_US
dc.typeJournal Articleen_US
cg.creator.idMoses, Thuita: 0000-0002-6731-9492en_US
cg.creator.idVanlauwe, Bernard: 0000-0001-6016-6027en_US
cg.creator.idMasso, Cargele: 0000-0002-3980-6832en_US
cg.subject.agrovocsoil fertilityen_US
cg.subject.agrovocspatial analysisen_US
cg.subject.agrovocbiological nitrogen fixationen_US
cg.contributor.centerInternational Institute of Tropical Agriculture - IITAen_US
cg.contributor.crpCGIAR Research Program on Grain Legumes - GLen_US
cg.contributor.funderBill & Melinda Gates Foundation - BMGFen_US
cg.coverage.regionEastern Africaen_US
dc.identifier.statusOpen accessen_US

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