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The influence of potassium fertilizer source and the increasing potassium fertilization levels (0, 200, 400 and 600 mg 2 /kg soil) supplied either as K 2 SO4 or KCl at equal nitrogen and phosphorus fertilizer background (200 mg N/kg and 150 mg P 2 O 5 /kg soil) on the content and the uptake of nutrient elements from the soil in potato plant parts was studied. Pot experiment was carried out. The fertilization with K 2 SO 4 decreased N content in roots from 2.91% at level 200 t 2.52% at level 600 and increased N content in aboveground biomass compared to the control and variants fertilized with KCl. The increasing KCl rates led to decreasing of N content in aboveground biomass from 4.03% at 200 to 2.34% at potassium level 400 . Nitrogen content in tubers at variants fertilized with K decreased compared to the control. Potassium fertilization did not influence considerably P content in the plant parts. The content in plant parts at variants fertilized with KCl was higher than the plants fertilized with K 2 SO 4 . Approximately 74% of absorbed nitrogen from the soil was allocated in the above ground biomass. The rest of the nitrogen was distributed between roots (17%) and tubers (9%). The highest P uptake was determined in control plants. The quantity of the uptaken K allocated in aboveground biomass was the highest (83%). The rest of K was distributed between roots (11%) and tubers (6%).

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