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

dc.contributor.authorMusinguzi, P.
dc.contributor.authorEbanyat, Peter
dc.contributor.authorTenywa, J.S.
dc.contributor.authorBasamba, T.A.
dc.contributor.authorTenywa, M.M.
dc.contributor.authorMubiru, D.N.
dc.date.accessioned2019-12-04T11:04:06Z
dc.date.available2019-12-04T11:04:06Z
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.
dc.identifier.issn0014-4797
dc.identifier.urihttps://hdl.handle.net/20.500.12478/1339
dc.descriptionPublished online: 18 January 2016
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.
dc.format.extent635-653
dc.language.isoen
dc.subjectSoil Fertility
dc.subjectMaize
dc.subjectMineral Fertilizer
dc.subjectSoil Organic Matter
dc.subjectFerralsols
dc.titleCritical soil organic carbon range for optimal crop response to mineral fertiliser nitrogen on a ferralsol.
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.crpIntegrated Systems for the Humid Tropics
cg.contributor.affiliationMakerere University
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationNational Agricultural Research Organisation, Uganda
cg.coverage.regionAfrica
cg.coverage.regionEast Africa
cg.coverage.countryUganda
cg.identifier.urlhttps://dx.doi.org/10.1017/S0014479715000307
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectMaize
cg.journalExperimental Agriculture
cg.howpublishedFormally Published
cg.accessibilitystatusLimited Access
local.dspaceid79284
cg.targetaudienceScientists
cg.identifier.doihttps://dx.doi.org/10.1017/S0014479715000307


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