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dc.contributor.authorMusinguzi, P.
dc.contributor.authorEbanyat, P.
dc.contributor.authorTenywa, J.S.
dc.contributor.authorBasamba, T.A.
dc.contributor.authorTenywa, M.M.
dc.contributor.authorMubiru, D.N.
dc.date.accessioned2016-10-25T12:36:15Z
dc.date.available2016-10-25T12:36:15Z
dc.date.issued2016-10
dc.identifier.citationMusinguzi, P., Ebanyat, P., Tenywa, J.S., Basamba, T.A., Tenywa, M.M. & Mubiru, D.N. (2016). Critical soil organic carbon range for optimal crop response to mineral fertiliser nitrogen on a ferralsol. Experimental Agriculture, 52(4), 635-653.en_US
dc.identifier.issn0014-4797
dc.identifier.urihttp://hdl.handle.net/10568/77391
dc.descriptionPublished online: 18 January 2016en_US
dc.description.abstractSoil Organic Carbon (SOC) is a major indicator of soil fertility in the tropics and underlies variability in crop response to mineral fertilizers. Critical SOC concentrations that interact positively with N fertilizer for optimal crop yield are less understood. A study was conducted on a Ferralsol in sub-humid Uganda to explore the critical range of SOC concentrations and associated fractions for optimal maize (Zea mays L.) yield response to applied mineral N fertiliser. Maize grain yield response to N rates applied at 0, 25, 50 and 100 kg N ha−1 in 30 fields of low fertility (SOC < 1.2%), medium fertility (SOC = 1.2–1.7%) and high fertility (SOC > 1.7%) was assessed. Soil was physically fractionated into sand-sized (63–2000 µm), silt-sized (2–63 µm) and clay-sized (<2 µm) particles and SOC content determined. Low fertility fields (<1.2% SOC) resulted in the lowest response to N application. Fields with >1.2% SOC registered the highest agronomic efficiency (AE) and grain yield. Non-linear regression models predicted critical SOC for optimal yields to be 2.204% at the 50 kg N ha−1 rate. Overall, models predicted 1.9–2.2% SOC as the critical concentration range for high yields. The critical range of SOC concentrations corresponded to 3.5–5.0 g kg−1 sand-sized C and 9–11 g kg−1 for clay-sized C.en_US
dc.format.extent635-653en_US
dc.language.isoenen_US
dc.sourceExperimental Agricultureen_US
dc.subjectSOIL FERTILITYen_US
dc.subjectMAIZEen_US
dc.subjectMINERAL FERTILIZERen_US
dc.subjectSOIL ORGANIC MATTERen_US
dc.subjectFERRALSOLSen_US
dc.titleCritical soil organic carbon range for optimal crop response to mineral fertiliser nitrogen on a ferralsol.en_US
dc.description.versionPeer Reviewen_US
dc.typeJournal Articleen_US
cg.authorship.typesCGIAR and developing country instituteen_US
cg.subject.iitaMAIZEen_US
cg.identifier.statusLimited Accessen_US
cg.contributor.affiliationMakerere Universityen_US
cg.contributor.affiliationInternational Institute of Tropical Agricultureen_US
cg.contributor.affiliationNational Agricultural Research Laboratories Remove, Ugandaen_US
cg.targetaudienceSCIENTISTSen_US
cg.fulltextstatusFormally Publisheden_US
cg.identifier.urlhttps://dx.doi.org/10.1017/S0014479715000307en_US
cg.identifier.doihttps://dx.doi.org/10.1017/S0014479715000307en_US
cg.isijournalISI Journalen_US
cg.coverage.regionAFRICAen_US
cg.coverage.regionEAST AFRICAen_US
cg.coverage.countryUGANDAen_US
cg.contributor.crpHUMIDTROPICSen_US


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