Effect of conditions of locality, variety and fertilization on the content of ascorbic acid in potato tubers
2007
Hamouz, K.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | 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 | Duskova, O.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Cizek, M.,Vyzkumny Ustav Bramborarsky, Havlickuv Brod (Czech Republic)
Field trials were conducted in four localities (Prerov nad Labem, Praha-Suchdol, Lipa, Stachy) in the Czech Republic during the years 2004 and 2005 to examine the influence of locality, genotype (8 varieties) and fertilization with inorganic fertilizers (N, P, K) on the concentration of ascorbic acid (AA) in potatoes. All the three factors studied significantly influenced AA concentrations. The highest value was determined in the locality of Prerov nad Labem with the highest average temperatures during both experimental years (by 6.7 to 11.5% higher in comparison with other localities). The variety Marabel had the highest AA concentration (207.2 mg/kg fw) which exceeded the values in the other studied varieties by 15-49%. A negative effect of increased N fertilization was observed as AA concentration decreased by 6.1% at 180 kg N/ha in comparison with 100 kg N/ha. On the contrary, a favourable effect of K and Mg fertilization was determined as AA concentration was by 6.2% higher at 166 kg K/ha and 60 kg Mg/ha than at the levels of 108 kg K/ha and 30 kg Mg/ha.
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