EN
Studies were designed to compare the efficacy of reduced doses of herbicides in the cultivation of maize in terms of north-eastern Poland. Treatments were performed at three dates: preemergence, the stage BBCH 12/13 (2 to 3 leaf) and stage BBCH 14/15 (4 to 5 leaves). The herbicide Lumax 537,5 SE showed the most effective weed control in maize regardless of the application date and used doses. The weed species Elymus repens was characterized by the highest level of resistance to all herbicides analyzed, including Lumax 537,5 SE, which was effective from 3 to 23%. The results of this study revealed the possibility of reduced doses of herbicides in maize protection against weed infestation, assuming that the following requirements are met: properly prepared position for maize cultivation by agricultural measures and a prevalance of weed species sensitive to active substance of used herbicides.