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    Soyabean response to rhizobium inoculation across sub-Saharan Africa: Patterns of variation and the role of promiscuity

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    U17ArtVanheerwaardenSoyabeanInthomNodev.pdf (2.130Mb)
    Date
    2018
    Author
    Heerwaarden, Joost van
    Baijukya, Frederick P.
    Kyei-Boahen, S.
    Adjei-Nsiah, Samuel
    Ebanyat, Peter
    Kamai, N.
    Woldemeskel, Endalkachew
    Kanampiu, F.
    Vanlauwe, Bernard
    Giller, Ken E.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Improving 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.
    http://dx.doi.org/10.1016/j.agee.2017.08.016
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/2155
    Digital Object Identifier (DOI)
    http://dx.doi.org/10.1016/j.agee.2017.08.016
    IITA Subjects
    Grain Legumes; Soybean
    Agrovoc Terms
    Bradyrhizobium; Soybeans; Farmers; Sustainable Agriculture; Intensification; Varieties; Grain Legumes
    Regions
    Africa; Central Africa; East Africa; Southern Africa; West Africa
    Countries
    Congo, Dr; Ethiopia; Ghana; Kenya; Malawi; Mozambique; Nigeria; Rwanda; Uganda; Zimbabwe
    Journals
    Agriculture, Ecosystems & Environment
    Collections
    • Journal and Journal Articles5283
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