In field experiments conducted on average soil in the years 2003–2006 on two levels soil fertilizations NPK the productive effects and qualitative foliar fertilization of potato Sonata Z and Alkalin PK 10 : 20 was defined. After Sonata Z foliar fertilization on the lower level fertilization soil in a dose 2 × 1.5 kg.ha-1 a rise of the trade crop about 13.7% was obtained, crop of large tubers about 13.3% and the crop of the seed potato fraction about 11.8%. Higher productive effects in the trade crop by about 17.2 % and seed potato about 24.5 % were obtained if Sonata Z was applied in 10% solution of urea. Use of foliar Alkalin PK 10 : 20 in a dose 2 × 3 l.ha-1 influenced the rise of trade crop by about 22.6%, the crop of large tubers by about 27.0%, and the seed potato crop by about 16.2%. With a higher level of fertilization the effects of productive foliar of fertilization Alkalin PK 10 : 20 and Sonata Z were lower the studied fertilizers influenced the extension of the cycle tuberization and growth of index reproduction but they did not affect the quality of tubers or infection with diseases, however reducing the content of nitrate in tubers.
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