The aim of this research work was the observation of changes in the qualitative and quantitative parameters of five cultivars of edible potatoes: Agria, Impala, Picasso, Raja, Santé. Samples were stored under regulated conditions in the storage room of the farm Agropartner Plavecké Podhradie, in the branch of Sološnica, Slovakia. Samples were taken three times during the tuber storage. The following parameters were investigated during three years observations: content of dry matter, starch content, total sugars, reducing sugars, nitrates and the content of vitamin C. Considering the dry matter content as the basic stabilizing component, the cv. Santé is the most appropriate for storage. Starch level was the highest in cvs Raja and lowest in Impala. Taking sugar levels into consideration we recommend cv. Agria as the most appropriate and the most stable for storage. This cultivar is the most suitable for technological processing and manufacture of French fries and chips as well. Regarding the nitrate cumulation, all cultivars may be considered to be safe, the determined levels of nitrates were low. The values of vitamin C were lower as compared to the potential levels of this component in edible potatoes. The highest level was in the cv. Agria. This parameter also showed the least fluctuations.