Effect of herbicides mixture on weed control efficacy and oat yield

In order to select suitable combinations of herbicides for oat fields, 96% S-metolachlor in combination with 10% bensulfuron methyl and 57% 2,4-D butyl ester with 10% fluoroglycofen were evaluated in different ratios and concentrations for their weed control efficacy, oat yield, and safety. The results showed that there were significant differences among the treatments (P < 0.05). The average control effect of mixed herbicides was higher than that of the single agents: T₅ and T₉ had the highest weed control efficacy, but the latter injured oat plants. For a safe combination, weed control efficacy, and oat yield improvement, the best combination was 57% 2,4-D butyl ester (438.5 mL·ha^–1) and 10% fluoroglycofen (300 mL·ha^–1)(T₁₂), which resulted in 87.99% weed control efficacy, 9 875.3 kg·ha^–1 oat hay yield, and 4 314.3 kg·ha^–1 grain yield.