EN
A field experiment was conducted in 2008–2009 at two Experimental stations Brody and Przybroda – Experimental Station of Poznan University of Life Sciences. The aim of this study was to compare the efficacy of Select Super 120 EC herbicide used in winter oilseed rape at different doses in the autumn (Brody) T1 – BBCH 12–13 and in the spring (Przybroda) T2 – BBCH 33. Conducted investigations showed 85% efficacy of Select Super 120 EC applied in the autumn at the dose of 0.6 l/ha in controlling volunteers triticale. Weed control was more efficient after the spring herbicide application. The highest control efficacy of barley volunteers, 99% was obtained with treatment where Select Super 120 EC was used at the dose of 0.6 l/ha. The increased dose of this herbicide to 0.8 l/ha and 1.0 l/ha didn’t improve weed control. The treatment where Targa Super 05 EC was used at the dose 1.0 l/ha showed 98% efficacy and was comparable to the treatment with herbicide Select Super 120 EC used at the dose of 0.6 l/ha. There was no significant influence of herbicide treatments on weight of 1000 seeds, weight of hectoliter and on yield of winter oilseed rape. The highest oilseed rape yield was obtained with Select Super 120 EC herbicide at the dose of 0.8 l/ha (4.5 t/ha).