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

dc.contributor.authorMacCarthy, Dilys S.
dc.contributor.authorAdiku, Samuel G.K.
dc.contributor.authorFreduah, B.S.
dc.contributor.authorKamara, A.Y.
dc.contributor.authorNarh, S.
dc.contributor.authorAbdulai, A.L.
dc.date.accessioned2019-12-04T11:10:51Z
dc.date.available2019-12-04T11:10:51Z
dc.date.issued2017
dc.identifier.citationMacCarthy, D.S., Adiku, S.G., Freduah, B.S., Kamara, A.Y., Narh, S. & Abdulai, A.L. (2017). Evaluating maize yield variability and gaps in two agroecologies in northern Ghana using a crop simulation model. South African Journal of Plant and Soil, 1-11.
dc.identifier.issn0257-1862
dc.identifier.urihttps://hdl.handle.net/20.500.12478/2285
dc.descriptionArticle purchased; Published online: 19 Oct 2017
dc.description.abstractThe 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.
dc.format.extent1-11
dc.language.isoen
dc.subjectMaize
dc.subjectFertilizer Application
dc.subjectCrop Simulation Model
dc.subjectYield Variability
dc.subjectYield Gap
dc.titleEvaluating maize yield variability and gaps in two agroecologies in northern Ghana using a crop simulation model
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.crpGrain Legumes
cg.contributor.crpMaize
cg.contributor.crpWater, Land and Ecosystems
cg.contributor.affiliationUniversity of Ghana
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationSavanna Agricultural Research Institute, Ghana
cg.coverage.regionAfrica
cg.coverage.regionWest Africa
cg.coverage.countryGhana
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectMaize
cg.journalSouth African Journal of Plant and Soil
cg.howpublishedFormally Published
cg.accessibilitystatusOpen Access
local.dspaceid91894
cg.targetaudienceScientists
cg.identifier.doihttp://dx.doi.org/10.1080/02571862.2017.1354407


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