EN
The studies were conducted to determine the effect of total precipitation and its distribution during potato vegetation on the occurence of mechanical damages of potato tubers at harvesting. Four potato cultivars (Aba, Atol, Certa and Mila) were tested within the years 1987-1991. It was found that mechanical damage resistance of the potato tubers decreased as the rainfall total during vegetation increased. The reinfall in August and September affects significantly the soil moisture content during potato harvest and its increased rate caused more mechanical damages of potato tubers.