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Impacts of nitrogen fertilization and planting date on the physiology and yield of purple sweet potato at the extreme Northern edge of cultivation

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dc.contributor.authorZekker, Ivar
dc.contributor.authorKännaste, Astrid
dc.contributor.authorEremeev, Viacheslav
dc.contributor.authorKask, Kaia
dc.contributor.authorMeinson, Pille
dc.contributor.authorNassar, Helina
dc.contributor.authorMäeorg, Erkki
dc.contributor.authorRunno-Paurson, Eve
dc.contributor.authorNiinemets, Ülo
dc.date.accessioned2024-11-01T10:43:36Z
dc.date.available2024-11-01T10:43:36Z
dc.date.issued2019
dc.description.abstractGlobal warming causes plant stress and reduces crop productivity. Cultivation of the warmer region crop sweet potato (Ipomoea batatas (L.) Lam) in Northern regions can be an opportunity to benefit from climate warming, but there is little information of how growing season length interacts with agricultural practices such as nitrogen (N) fertilization. We studied the photosynthetic characteristics, biomass accumulation, carbon (C) and N contents of plant organs of the cultivar ´Purple Bud´ in relation to the planting date (the 2nd of May, 10th of May, 20th of May, 30th of May and 10th of June) and N fertilization (kg ha-1; N0, N50, N100 and N150). Nitrogen content of leaves (NL) and tubers (NT) increased with N application dose and was moderately affected by planting time. Despite the fertilization-dependent increase of leaf N content, photosynthesis rate (A) was unaffected or somewhat reduced by N fertilization. This reflected reductions in stomatal conductance (gs) and ratio of intercellular CO2 to ambient CO2 (Ci/Ca), suggesting that enhanced N availability and concomitant increase in whole plant area resulted in reduced plant water availability. The highest tuber C/N ratio, tuber biomass and dry matter content of roots were found in N0 and N50 plants from the longest growing period. Our results collectively demonstrate that the growth and productivity of sweet potato is strongly dependent on the length of the growing season, and can be further constrained by utilization efficiency of N. We conclude that future research should focus on optimum sweet potato cultivation technologies at Northern latitudes.eng
dc.description.abstractThe study was supported by the European Regional Development Fund (Center of Excellence EcolChange: Ecology of global change: natural and managed ecosystems), the Centre of Excellence AgroCropFuture financed by the Ministry of Education and Research in Estonia and the Estonian University of Life Sciences base funding projects P190259PKTT and P200193PKTT. The study used equipment purchased within the framework of the AnaEE Estonia Project (2014– 2020.4.01.20-0285) and the project “Plant Biology Infrastructure-TAIM” (2014–2020.4.01.20- 0282) through the EU Regional Development Fund and „Plant Biology Infrastructure – TAIM“ funded by the Estonian Research Council (TT5).eng
dc.description.sponsorshipThe study was supported by the European Regional Development Fund (Center of Excellence EcolChange: Ecology of global change: natural and managed ecosystems), the Centre of Excellence AgroCropFuture financed by the Ministry of Education and Research in Estonia and the Estonian University of Life Sciences base funding projects P190259PKTT and P200193PKTT. The study used equipment purchased within the framework of the AnaEE Estonia Project (2014– 2020.4.01.20-0285) and the project “Plant Biology Infrastructure-TAIM” (2014–2020.4.01.20- 0282) through the EU Regional Development Fund and „Plant Biology Infrastructure – TAIM“ funded by the Estonian Research Council (TT5).eng
dc.identifier.urihttp://hdl.handle.net/10492/9502
dc.identifier.urihttps://doi.org/10.15159/ds.24.04
dc.publisherEstonian University of Life Scienceseng
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)eng
dc.rightsinfo:eu-repo/semantics/openAccesseng
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/eng
dc.subjectN-fertilizingeng
dc.subjectC contenteng
dc.subjectN contenteng
dc.subjectIpomoea batataslat
dc.subjectphotosynthetic characteristicseng
dc.subjectyieldeng
dc.subjectdataeng
dc.titleImpacts of nitrogen fertilization and planting date on the physiology and yield of purple sweet potato at the extreme Northern edge of cultivationeng
dc.typeDataseteng

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