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dc.contributor.authorKihara, Job
dc.contributor.authorSileshi, Gudeta W.
dc.contributor.authorNziguheba, Generose
dc.contributor.authorKinyua, Michael
dc.contributor.authorZingore, Shamie
dc.contributor.authorSommer, Rolf
dc.date.accessioned2017-07-07T14:21:29Z
dc.date.available2017-07-07T14:21:29Z
dc.date.issued2017-07-03
dc.identifier.citationKihara, Job; Sileshi, Gudeta Weldesemayat; Nziguheba, Generose; Kinyua, Michael; Zingore, Shamie; Sommer, Rolf. 2017. Application of secondary nutrients and micronutrients increases crop yields in sub-Saharan Africa . Agronomy for Sustainable Development 37:25.en_US
dc.identifier.urihttp://hdl.handle.net/10568/82689
dc.description.abstractSecondary and micronutrients are important in enhancing crop productivity; yet, they are hardly studied in sub-Sahara Africa. In this region, the main focus has been on macronutrients but there is emerging though scattered evidence of crop productivity limitations by the secondary and micronutrients. Elsewhere, widespread deficiencies of these nutrients are associated with stagnation of yields. Here, we undertake a meta-analysis using 40 articles reporting crop response to secondary and micronutrients to (1) determine the productivity increase of crops and nutrient use efficiency associated with these nutrients, and (2) provide synthesis of responses to secondary nutrients and micronutrients in sub-Sahara Africa. This study used 757 yield data rows (530 from publications and 227 from Africa Soil Information Service) from field trials carried out in SSA between 1969 and 2013 in 14 countries. Data from publications constituted response to S (49.4%), Zn (23.0%), S and micronutrient combinations (11.5%), and <10% each for Cu, Mo, Fe, and B. Data from Africa Soil Information Service were all for S and micronutrient combinations. Of the two sources, most yield data are for maize (73.6%), followed by sorghum (6.7%) and wheat (6.1%) while rice, cowpea, faba bean, tef, and soybean each accounted for less than 5%. The major points are the following: (1) application of S and micronutrients increased maize yield by 0.84 t ha−1 (i.e., 25%) over macronutrient only treatment and achieved agronomic efficiencies (kilograms of grain increase per kilogram of micronutrient added) between 38 and 432 and (2) response ratios were >1 for S and all micronutrients, i.e., the probability of response ratio exceeding 1 was 0.77 for S and 0.83 for Zn, 0.95 for Cu, and 0.92 for Fe, and indicates positive crop response for a majority of farmers. We conclude that S and micronutrients are holding back crop productivity especially on soils where response to macronutrients is low and that more research is needed to unravel conditions under which application of S and micronutrients may pose financial risks.en_US
dc.format.extent37:25en_US
dc.language.isoenen_US
dc.sourceAgronomy for Sustainable Developmenten_US
dc.subjectAGRONOMIC EFFICIENCYen_US
dc.subjectSURPHURen_US
dc.subjectAFRICA SOUTH OF SAHARAen_US
dc.subjectYIELDSen_US
dc.subjectMICRONUTRIENTSen_US
dc.subjectPRODUCTIVITYen_US
dc.subjectAZUFREen_US
dc.subjectRENDIMIENTOen_US
dc.subjectÁFRICA AL SUR DEL SAHARAen_US
dc.subjectMICRONUTRIENTESen_US
dc.subjectPRODUCTIVIDADen_US
dc.titleApplication of secondary nutrients and micronutrients increases crop yields in sub-Saharan Africaen_US
dc.description.versionPeer Reviewen_US
dc.typeJournal Article
cg.authorship.typesCGIAR and developing country instituteen_US
cg.authorship.typesCGIAR and advanced research instituteen_US
cg.identifier.statusOpen Accessen_US
cg.contributor.affiliationInternational Center for Tropical Agriculture
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationKenyatta University
cg.contributor.affiliationInternational Plant Nutrition Institute
cg.targetaudienceSCIENTISTSen_US
cg.identifier.doihttps://doi.org/10.1007/s13593-017-0431-0en_US
cg.identifier.dataurlhttp://dx.doi.org/10.7910/DVN/8AJQJJ
cg.isijournalISI Journalen_US
cg.coverage.regionAFRICAen_US
cg.coverage.regionAFRICA SOUTH OF SAHARAen_US
cg.creator.idJob Kihara: 0000-0002-4394-9553
cg.creator.idRolf Sommer: 0000-0001-7599-9056


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