Critical soil organic carbon range for optimal crop response to mineral fertiliser nitrogen on a ferralsol

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cg.authorship.typesCGIAR and developing country instituteen
cg.contributor.affiliationMakerere Universityen
cg.contributor.affiliationInternational Institute of Tropical Agricultureen
cg.contributor.affiliationNational Agricultural Research Organisation, Ugandaen
cg.contributor.crpIntegrated Systems for the Humid Tropics
cg.coverage.countryUganda
cg.coverage.iso3166-alpha2UG
cg.coverage.regionAfrica
cg.coverage.regionEastern Africa
cg.howPublishedFormally Publisheden
cg.identifier.doihttps://doi.org/10.1017/s0014479715000307en
cg.isijournalISI Journalen
cg.issn0014-4797en
cg.issue4en
cg.journalExperimental Agricultureen
cg.reviewStatusPeer Reviewen
cg.subject.iitaMAIZEen
cg.volume52en
dc.contributor.authorMusinguzi, P.en
dc.contributor.authorEbanyat, Peteren
dc.contributor.authorTenywa, J.S.en
dc.contributor.authorBasamba, T.A.A.en
dc.contributor.authorTenywa, M.M.en
dc.contributor.authorMubiru, D.N.en
dc.date.accessioned2016-10-25T12:36:15Zen
dc.date.available2016-10-25T12:36:15Zen
dc.identifier.urihttps://hdl.handle.net/10568/77391
dc.titleCritical soil organic carbon range for optimal crop response to mineral fertiliser nitrogen on a ferralsolen
dcterms.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
dcterms.accessRightsLimited Access
dcterms.audienceScientistsen
dcterms.available2016-01-18
dcterms.bibliographicCitationMusinguzi, 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
dcterms.extent635-653en
dcterms.issued2016-10
dcterms.languageen
dcterms.licenseCopyrighted; all rights reserved
dcterms.publisherCambridge University Pressen
dcterms.subjectsoil fertilityen
dcterms.subjectmaizeen
dcterms.subjectmineral fertilizeren
dcterms.subjectsoil organic matteren
dcterms.subjectferralsolsen
dcterms.typeJournal Article

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