Comparision Test of Five Kinds of Herbicide against Main Weeds in Brassica campestris Field

This paper studied five kinds of herbicide against main weeds in Brassica campestris field. The results showed that the efficacy of acetochlor +clomazone 35% EC 1 200 g·hm-2was best to control Alopecurus aequalis Sobol, bedstraw, Veronica didyma Tenore, were all above 93% after 45 days. Pendimethalin 33% EC 2 250 g·hm-2to control bedstraw, Veronica didyma Tenore, were89.7% and 88.4%,but poaceae weeds Alopecurus aequalis Sobol was 61.5%, the efficacy was poor; the efficacy of metolachlor 72%EC 1 500 g·hm-2to control Alopecurus aequalis Sobol was 87.7%, the efficacy ofdicotyledonous weeds was poor; Napropamide 50%WP 1 500 g·hm-2to control monocotyledonous weedsanddicotyledonous weeds were less than 74.1%, unsuitable for separate application.