EN
The aim of this study was to determine germination ability, seedling vigour, grain yield, yield components, and stand architecture of winter triticale cultivars Tornado and Lamberto as influenced by seed size. The laboratory, pots and microplots experiments were performed in 2000-2003 years in Pulawy. The factor was seed size. Four levels of the seed size factor were tested: certified seeds, large seeds, medium-sized seeds, small seeds. The experimental seeds samples were separated from commercial certified seed lots. Plumpness of seeds resulted in bigger dynamics and speed emergence. Grain yield was significantly lower when plantings were made with small seeds and medium seeds instead of large seeds or with certified seeds. The use of largest seeds and certified seeds caused an increase in the number of plants and heads per area units in the year 2001 and an increase in the number of heads per area units, grain yield per plant, number of grains per plant in the years 2002 and 2003.