Impacts of nitrogen fertilization and planting date on the physiology and yield of purple sweet potato at the extreme Northern edge of cultivation
Pisipilt ei ole saadaval
Kuupäev
2019
Kättesaadav alates
Autorid
Zekker, Ivar
Kännaste, Astrid
Eremeev, Viacheslav
Kask, Kaia
Meinson, Pille
Nassar, Helina
Mäeorg, Erkki
Runno-Paurson, Eve
Niinemets, Ülo
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Estonian University of Life Sciences
Abstrakt
Global 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.
The 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).
The 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).
Kirjeldus
Märksõnad
N-fertilizing, C content, N content, Ipomoea batatas, photosynthetic characteristics, yield, data