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    Evaluating maize yield variability and gaps in two agroecologies in northern Ghana using a crop simulation model

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    U17ArtMaccarthyEvaluatingInthomDev.pdf (1.223Mb)
    Date
    2017
    Author
    MacCarthy, Dilys S.
    Adiku, Samuel G.K.
    Freduah, B.S.
    Kamara, A.Y.
    Narh, S.
    Abdulai, A.L.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    The yield gap and variability in maize under smallholder systems in two agroecologies in northern Ghana were evaluated using a decision support system for agrotechnology transfer (DSSAT). The model was used to assess (1) the potential yield of maize (YPOT), (2) water-limited exploitable maize yield (YWEX), (3) nitrogen-limited yield (YNI), (4) farmer practice maize yield (YCFP) and (5) proposed enhanced nutrient use yield (enhanced farmer practice; YEFP). Effect of supplementary irrigation was also assessed on YCFP and YEFP conditions. Yield gaps were determined as the difference between YPOT and YCFP or YEFP on the one hand, and between YWEX and YCFP or YEFP on the other hand. The yield gap based on potential yield ranged from 59% to 75% under CFP and narrowed to between 29% and 59% under EFP. With water-limited exploitable yields, the yield gap ranged from 53% to 65% under CFP, reducing to between 22% and 42% under EFP. The use of supplementary irrigation further reduced the yield gap. Improved fertiliser use and supplementary irrigation have the potential to increase yield and hence reduce the yield gap if effective policies and institutional structures are in place to provide farmers with credit facilities and farm inputs.
    http://dx.doi.org/10.1080/02571862.2017.1354407
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/2285
    Digital Object Identifier (DOI)
    http://dx.doi.org/10.1080/02571862.2017.1354407
    IITA Subjects
    Maize
    Agrovoc Terms
    Maize; Fertilizer Application; Crop Simulation Model; Yield Variability; Yield Gap
    Regions
    Africa; West Africa
    Countries
    Ghana
    Journals
    South African Journal of Plant and Soil
    Collections
    • Journal and Journal Articles5283
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