Tolerance tests to cykloksydym of different maize varieties were conducted on experimental fields belonging to BASF company in Pągów, Opole province. The experiments were performed in randomized block design with 4 repetitions on plots of the area of 21 m2. Herbicide Focus Ultra 100 EC was applied during late plant developement phases, i.e. at 6–8 leaf phase in doses of 1.5 and 2.0 l/ha. During the experiments it was established, that as far as the growth rate and yield were concerned, the cycloxydim resistant maize varieties did not differ from the same varieties from control fields, where weeding was performed only mechanically. Some differences were observed between tested varieties in different years, which was a result of different meteorological conditions.
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