In the research an attempt of comparing physical parameters of potatoe tubers diversified in terms of the technology, cultivation and variety was made. Research were carried out on two variants of potatoes tubers i.e. of Lady Claire and the Saturna planted on the irrigated and not-irrigated field. In laboratory testing a video-computer method was used – letting determine geometrical parameters and enumerate rates of form factor. Statistically significant differences were observed between medium value of friction coefficient of potatoe tubers planted on the irrigated and not-irrigated field. Sprinkling of the plantation had an effect on reducing the elongation rates and increasing flattening rates of the tubers. Tubers from the sprinkled field are in the greater degree similar to the spherical-oval shape, hence the joint surface with the rubbing base is smaller, and the pressure of tubers to this surface is bigger.