This work presents the results of the study conducted in 2004-2006 at the Agricultural Experimental Station (RSD) in Zawady of the University of Natural Sciences and Humanities in Siedlce, concerning the effect of the ridge shape and harvest time, determined by the soil temperature, on the total and commercial tuber yield of potato. Analysis of results was carried out based on a three-year three-factorial (factor A – cultivar, factor B – soil temperature during harvest, factor C – ridge shape) field experiment established in split-split-plot design. Environmental conditions during the growing period played an important role in affecting the most of studied features of potato. The cultivar Sante gave the highest yields, whereas the cultivar Żagiel was characterized by the highest commercial yield. Ridge shape had a significant effect on the quantity of commercial yield. At growing potato in a typical ridge (20 cm in height) commercial yield was the highest. Another important factor was the time of harvest, which in parabolic way determined the total tuber yield.

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