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    Lowland rice yield and profit response to fertilizer application in Rwanda

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    Journal Article (1.576Mb)
    Date
    2019-12-10
    Author
    Nabahungu, N.L.
    Cyamweshi, A.R.
    Kayumba, J.
    Kokou, K.
    Mukuralinda, A.
    Cirhuza, J.M.
    Wortmann, C.S.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Rice (Oryza sativa ) production in Rwanda increased by 70% while yield ha−1 decreased during the past decade. Yield has biotic and abiotic constraints including inadequate nutrient supply. Yield response functions for N, P, and K were determined in eight marshlands grouped into four clusters. Additional treatment allowed for the diagnosis of response to Mg–S–Zn–B (MgSZnB). Rice grain yield with no fertilizer applied was 2.27 Mg ha−1. Mean yield increases were 2.35, 1.53, and 1.71 Mg ha−1 with N, P, and K application, respectively. The mean economically optimal rates (EOR) were 58 to >150, 11–30, and 21–35 kg ha−1 for N, P, and K, respectively, depending on cluster and the cost of fertilizer. Yield responses to nutrient rates were similar across marshland clusters, and a single response function for each of P and K can serve all four clusters, while the response to N differed for Cluster B compared with A, BC, and C. Net returns to applied P and K were greater than for N, but the application of N is likely needed for such responses to P and K. The MgSZnB resulted in a mean grain yield increase of 1.72 Mg ha−1 with increases in all marshlands, but the information was not sufficient to determine which nutrients of MgSZnB were deficient or their optimal application rates. Fertilizer use can be very profitable for rice production in Rwanda. Profit can be enhanced with the application at less than EOR when fertilizer use is financially constrained.
    https://dx.doi.org/10.1002/agj2.20006
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/6917
    IITA Authors ORCID
    Nsharwasi Nabahunguhttps://orcid.org/0000-0002-2104-3777
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1002/agj2.20006
    Research Themes
    Natural Resource Management
    IITA Subjects
    Agribusiness; Agronomy; Farm Management; Food Security; Integrated Soil Fertility Management; Soil Fertility
    Agrovoc Terms
    Oryza Sativa; Rwanda; Yields; Profit; Costs; Fertilizers; Biotic Factors; Abiotic Factors
    Regions
    Africa; Central Africa
    Countries
    Rwanda
    Hubs
    Central Africa Hub
    Journals
    Agronomy Journal
    Collections
    • Journal and Journal Articles4835
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