EFFICIENCY OF METRIBUZIN-CONTAINING HERBICIDES WHEN THEY ARE APPLIED TO WINTER GRAIN CROPS IN SPRING AND AUTUMN

Abstract

When metribuzin containing herbicides are applied to winter grain crops, 80–95 % of Stellaria media, Сapsella bursapastoris, Myosotis arvensis, Galeopsis tetrahit, Thlaspi arvense, Apera spica-venti die as well as 40–80 % of Viola arvensis, 30–60 % of Cirsium arvense and Sonchus arvensis, 70–90 % of Chenopodium album and Tripleurospermum ssp. When this kind of herbicides is applied in spring the efficiency is 10 % lower than in autumn, but the yield is almost the same or differs slightly. The cost of treatment of 1 ha of seeds with herbicides is compensated by 0.6–0.9 dt/ha of winter wheat, 0,8–1,3 dt/ha of winter triticale, 0.9–1.6 dt/ha of winter rye.