The experiment was conducted in years 1999-2001 at Wierzchucinek near Bydgoszcz on the good rye complex soil. The aim of the experiment was to assess the effect of soil fertilization of the potato with ammonium nitrate enriched with magnesium and molybdenum ("MagMol"), and ammonium nitrate with the addition of 3 and 6 kg·ha~(-1) of multi-component fertilizer called "Sonata" with reference to sole ammonium nitrate on the yield and selected features of the quality of the "Mila" variation potato bulbs. Basing on the obtained results, it was stated that the use of nitrogen with the addition of microelements diversified significantly the crop of potato bulbs as well as the contents and the yield of starch and the contents of phosphorus and potassium in the bulbs. The microelements applied together with nitrogen resulted in a decrease in the total nitrogen concentration and the protein crop. The used fertilization did not modify significantly a concentration of dry matter in the potato bulbs. The "Sonata" applied in the dose of 6 kg·ha~(-1) slightly modified the chemical contents of the crop comparing to the "Sonata" applied in the dose of 3 kg ha~(-1).
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