INFLUENCE OF SOME HERBICIDES ON WEED INFESTATION AND PRODUCTIVITY OF BIRD’S–FOOT TREFOIL

In the experimental field of RIMSA–Troyan was studied the herbicidal effect of Aramo 45 (45 g/L Tepraloxydim) at doses of 1 and 2 L/ha, and Dual Gold 960 EC (960g/L s– metolachlor)–2 and 3 L/ha, during the period of 2013–2015 on light grey pseudopodzolic soil, over the weed infestation level and productivity of bird's–foot–trefoil. It was found that both herbicides in both doses showed good selectivity in relation to bird's–foot trefoil. Most pronounced was the effect by the applied herbicides regarding the degree of weed infestation in the year of sowing, as the treatment by Aramo 45 at a dose of 2 L/ha and Dual Gold 960 EC at a dose of 2 L/ha provided a degree of weed infestation of 6.68 and 16.11 %. The vegetation treatment of a grassland of bird's– foot–trefoil by Aramo 45 herbicide at a dose of 1 and 2 L/ha led to an increase in dry matter yield with 21.85 and 18.21 %, and with Dual Gold 960 EC EK it was 24.28 and 30.29 %. Dual Gold 960 EC showed a greater effect from both tested herbicides over the dry matter yield, applied at a dose of 3 l/ha at a phase of 2–4 leaf stage of bird's–foot trefoil. That herbicide could be recommended for the application in the practice in creating weed–free crops of bird's–foot–trefoil for forage production. Keyword: bird's–foot–trefoil, herbicides, selectivity, degree of weed infestation, dry matter yield