The aim of the paper was investigation of ultraviolet radiation (UVC) impact on the growth, development and cropping of potato plants (Solanum tuberosum L). 132 potato plants of medium late cultivar Jelly, vegetation of which was carried out under the plastic tunnel constituted the research object. The author's stand for irradiation of plant material with ultraviolet was used. Seed potatoes, before placing them in the soil, were radiated with ultraviolet rays for 1,10,60 minutes at the constant distance of UVC radiators from the bottom of a chamber - 0.7 m. During vegetation period the rate of germination, flowering and withering of haulms, length and number of stems was determined and after harvesting the yield structure of each plant was determined. Essential impact of ultraviolet on the development of aboveground part of potato plants was reported. Statistical calculations were carried out at the assumed level of significance α=0.05.