To study the effect of various laboratory seedlings planting densities on potato mini-tuber yield, a research was conducted in the form of two-factor factorial design, in which factor A in 10 levels including Agria, Savalan, Marfona, Kaiser, Hermes, Arinda, Satina, Milva, Sante and Clone 397009-3 and the second factor included seedlings density at three levels of 100, 200 and 300 seedlings per square meter in the form of completely randomized design at the greenhouse of Ardabil Wilkij Company. During the research, traits such as number of tubers per pot, number of tubers to various diameters per pot and plant, number of tubers in area unit and average number of tubers per plant were assessed. After testing data to be normal, ANOVA was conducted. Results suggested that among various levels, factor A (studied cultivars) was significant at one percent on all assessed traits. Studies indicated that among various levels, factor B (seedlings density) was significant at one percent on number of tubers per pot, number of tubers with diameter of 5-7 mm per pot and number of tubers with diameter of 8-11 mm per pot, average number of tubers per plant and number of tubers in area unit. Also, there was a significant difference at 5 percent on the traits of number of tubers with diameter of 5-7 mm per pot and number of tubers with diameter of 8-11 mm per pot.
