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Wheat nutrient response functions for the east Africa highlands

dc.contributor.authorCyamweshi, A.R.
dc.contributor.authorNabahungu, L.N.
dc.contributor.authorSenkoro, C.J.
dc.contributor.authorKibunja, C.N.
dc.contributor.authorMukuralinda, A.
dc.contributor.authorKaizzi, K.C.
dc.contributor.authorMvuyekure, S.M.
dc.contributor.authorKayumba, J.
dc.contributor.authorNdungu-Magiroi, K.W.
dc.contributor.authorKoech, M.N.
dc.contributor.authorWortmann, C.S.
dc.date.accessioned2019-12-04T11:23:42Z
dc.date.available2019-12-04T11:23:42Z
dc.date.issued2018-05
dc.identifier.citationCyamweshi, A.R., Nabahungu, L.N., Senkoro, C.J., Kibunja, C., Mukuralinda, A., Kaizzi, K.C., ... & Wortmann, C.S. (2018). Wheat nutrient response functions for the east Africa highlands. Nutrient Cycling in Agroecosystems, 111(1), 21-32.
dc.identifier.issn1385-1314
dc.identifier.urihttps://hdl.handle.net/20.500.12478/4115
dc.descriptionPublished online: 24 Feb 2018
dc.description.abstractWheat (Triticum æstivum L.) is an important East Africa highland crop but yields are low. Information is scarce for optimization of fertilizer use. Research was conducted to determine yield response functions for N, P and K, and to diagnose Mg–S–Zn–B deficiencies. The average grain yield increase in Rwanda due to N application was 1.5 Mg ha−1 with a mean economically optimal rate (EOR) of 68 kg ha−1 N. In Kenya and Tanzania, yield was increased by 29% with EOR N for two SY but unaffected by N rate for four other SY which on average had 50% of the soil organic C (SOC) as the N-responsive SY. Yield was increased, on average, with application of P and K by 0.47 and 0.23 Mg ha−1, respectively, at EOR in Rwanda but effects were inconsistent for other SY where soil test K was higher than in Rwanda. Application of Mg–S–Zn–B resulted in 0.46 Mg ha−1 more yield in Rwanda but did not affect yield at other SY where the average soil test values for these nutrients was 35% higher than in Rwanda. If the financially constrained farmer opts to apply the affordable fertilizer to twice as much land at 50% EOR compared with 100% EOR, the mean yield increase is reduced by 27% but production and PCR are increased by 43 and 72%, respectively. Nutrient effects were relatively consistent and positive in Rwanda, but less and less inconsistent elsewhere with generally less SOC, more K–Mg–S–Zn–B availability, and often lower yields.
dc.description.sponsorshipAlliance for a Green Revolution in Africa
dc.format.extent21-32
dc.language.isoen
dc.subjectHighlands
dc.subjectFertilizers
dc.subjectApplication
dc.subjectTriticum Aestivum
dc.subjectWheat
dc.subjectNutrient
dc.titleWheat nutrient response functions for the east Africa highlands
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.crpRoots, Tubers and Bananas
cg.contributor.affiliationRwanda Agriculture Board
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationMlingano Agricultural Research Centre
cg.contributor.affiliationKenya Agricultural and Livestock Research Organization
cg.contributor.affiliationWorld Agroforestry Centre
cg.contributor.affiliationNational Agricultural Research Organisation, Uganda
cg.coverage.regionAfrica
cg.coverage.regionEast Africa
cg.coverage.countryKenya
cg.coverage.countryRwanda
cg.coverage.countryTanzania
cg.creator.identifierNsharwasi Nabahungu: 0000-0002-2104-3777
cg.researchthemeNATURAL RESOURCE MANAGEMENT
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectNatural Resource Management
cg.journalNutrient Cycling in Agroecosystems
cg.howpublishedFormally Published
cg.accessibilitystatusLimited Access
local.dspaceid99590
cg.targetaudienceScientists
cg.identifier.doihttps://dx.doi.org/10.1007/s10705-018-9912-z


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