The effect of site conditions, variety and fertilization on the content of polyphenols in potato tubers
2006
Hamouz, K.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju) E-mail:[email protected] | Lachman, J.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju) | Dvorak, P.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju) | Juzl, M.(Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic)) | Pivec, V.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju)
Precise field trials were conducted during the years 2004 and 2005 in order to evaluate the effect of site conditions (4 localities), yellow- and purple-fleshed potato varieties and fertilization on the concentration of total polyphenols (TP) in potato tubers. Significantly higher TP concentration (by 5.7 to 13.4% than in other localities) was determined in the locality with low temperatures in the vegetation period and high altitude. TP conc. depended on the variety, for example it was by 52 to 153% higher in the purple flesh Valfi variety than in yellow flesh varieties. As for the group of 8 yellow flesh varieties, Karin variety had the highest TP conc. and showed a significant increase in comparison with Agria, Saturna and Asterix varieties by 67, 60 and 37%, respectively. TP conc. was not affected by fertilization with mineral fertilizers, but we recorded a tendency to lesser TP conc. (by 3 to 9.9%) in the variant with high K and Mg fertilization (166 kg K/ha and 60 kg Mg/ha, respectively).
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