Three-year field experiments (2005-2007) were conducted at the Didactic and Experimental Station in Brody (52^o26’ N; 16^o18’ E) of Poznań University of Life Sciences. The aim of the study was to determine the effect of the herbicides Callisto 100 SC (mesotrione) and Maister 310 WG (foramsulfuron + iodosulfuron) applied with oil adjuvant (Actirob 842 EC) and mineral adjuvant – liquid fertilizer (UAN) on the efficacy of weed control and cob yield in the maize cultivar Fido. The herbicides were applied at recommended rates (1.5 dm³·ha^-1 and 150 g·ha^-1 respectively, without adjuvants) and reduced rates (0,75 or 0,50 dm³·ha^-1 and 75 or 50 g·ha^-1) with adjuvant Actirob 842 EC (methylated rape seed oil) at a rate of 1.5 dm³·ha^-1 and with liquid mineral fertilizer UAN (28% N urea-ammonium nitrate) at rates of 2, 4, and 8 dm³·ha^-1. The weed control efficacy of herbicides applied was determined based on the evaluation of weed infestation. Herbicides Callisto 100 SC and Maister 310 WG applied at recommended rates controlled Chenopodium album up to 90%, and Echinochloa crus-galli up to 60%; total weed control was 89 and 93%, respectively. Weed control using mixtures of herbicides at reduced rates with oil adjuvant and UAN was similar to weed control with herbicides applied at recommended rates. Cob yields on the treatments were at similar level; however, they were much higher than that on the control.

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