Selectivity of Some Herbicides to Cocksfoot (Dactylis glomerata L.), Grown for Seed Production

The study was conducted to determine selectivity of some herbicides to cocksfoot(Dactylis glomerata L.), and their influence on the seed production, during the years 2008-2010. The trial was set on the experimental field of the Institute of Forage Crops – Pleven, onslightly leached chernozem. As a result of the research the following was found: herbicidesArat (500 g/l dicamba + 250 g/l tritosulfuron) at the dose of 100 ml/ha, Korida 75 VDG (750g/kg tribenuron-methyl) – 15 g/ha and Cambio SL (320 g/l bentazon + 90 g/l dicamba) –1250 ml/ha and Grasp 25SK (250 g/l tralkoxyidim) + Atplus at rate of 1000 + 1000 ml/ha hadhigh selectivity to cocksfoot, applied at 2-4 leaf stage during establishing year of the stand,and until the stage of the beginning of shooting up in seed production year.Herbicide Topik 080EK (80 g/l clodinofop – propargyl + antidote) at rate of 300 ml/ha,showed phytotoxic effect to D. glomerata and caused the reduction of seed and dry biomassproductivity.