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Agronomy 2019, 9(3), 151; https://doi.org/10.3390/agronomy9030151

Impact of Nitrogen Fertilization on Tuber Yield, Sugar Composition and Nitrogen Uptake of Two Yacon (Smallanthus sonchifolius Poepp. & Endl.) Genotypes

1
Institute of Crop Science, Fruwirthstr. 23, University of Hohenheim, 70599 Stuttgart, Germany
2
Department of Biostatistics, Institute of Crop Science, Fruwirthstr. 23, University of Hohenheim, 70599 Stuttgart, Germany
*
Author to whom correspondence should be addressed.
Received: 25 February 2019 / Revised: 19 March 2019 / Accepted: 19 March 2019 / Published: 22 March 2019
(This article belongs to the Section Innovative Cropping Systems)
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Abstract

The tuberous root crop, yacon, is native to the Andean region and contains high amounts of fructooligosaccharides (FOS) with up to 70% of dry matter. Due to FOS, consumption of tubers may have health-promoting effects. However, regarding the overall cultivation system, no recommendations exist for farmers on nitrogen fertilization and nitrogen (N) uptake of yacon. Therefore, three different N fertilization levels (0, 40, and 80 kg N ha−1) and two genotypes (brown-shelled (BG) and red-shelled (RG)) were examined in a two-year field experiment regarding their tuber yield, sugar composition, and nitrogen uptake. Tuber yields increased with increasing fertilization level and were highest for B80 and R80 (50 and 67 t FM ha−1), while significant differences between the genotypes existed. Sugar and the amount of FOS slightly decreased with increasing N fertilization level, and ranged between 36% and 73% and 30% and 58% of dry matter, respectively. An overall decreasing amount of FOS led to a slight increase in the amount of FOS with a higher degree of polymerization. Regarding the N-use efficiency of tubers and the total plant, an N fertilization level of 40 kg N ha−1 seems to favor tuber yield. View Full-Text
Keywords: fructooligosaccharide; yacon; nitrogen content fructooligosaccharide; yacon; nitrogen content
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kamp, L.; Hartung, J.; Mast, B.; Graeff-Hönninger, S. Impact of Nitrogen Fertilization on Tuber Yield, Sugar Composition and Nitrogen Uptake of Two Yacon (Smallanthus sonchifolius Poepp. & Endl.) Genotypes. Agronomy 2019, 9, 151.

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