In 2003/2004 and 2004/2005 two field experiments were conducted. The aim of this research was to evaluate the influence of different herbicides on grain yield and yield components of winter wheat cultivars. The experiments differed by used doses of herbicides. The first factor of these experiments were herbicides differing in active ingredient: a1 – Huzar 05 WG (iodosulfuron), a2 – Puma Universal 069 WG (fenoxaprop-P-ethyl + mefenpyr-diethyl), a3 – Chwastox Extra 340 SL (MCPA). Check (control) plots were protected against weeds by hand weeding. The second factor were winter wheat cultivars: Finezja, Tonacja in 2003/2004 and Tonacja, Sukces in 2004/2005. Herbicides Puma Universal 069 WG i Chwastox Extra 340 SL used in an increased dose caused reduction in the level of grain yield of winter wheat in relation to the object with mechanical removal of weeds. The reduction in yield was the result of reducing the number of heads per unit area. Herbicides used in recommended doses had no effect on the level of yield of winter wheat.
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