Control of volunteer soybean plants with herbicides used in corn

Abstract

This study aimed at evaluating the effectiveness of several herbicides on the control of volunteer soybean plants. The experiment was carried out in a greenhouse, where the experimental units were composed of vessels with 10 dm³ capacity, arranged in a completely randomized design, in a 2 x 12  factorial scheme, with four replications. The cultivars Conquista and Valiosa RR^® underwent an application of the herbicides: atrazine (1.500 g ha^-1), tembotrione (100 g ha^-1), mesotrione (120 g ha^-1), nicosulfuron (40 g ha^-1), 2.4 D (670; 1,050 and 1,340 g ha^-1), diquat (300 g ha^-1), paraquat (400 g ha^-1), [paraquat + diuron] (500 + 250 g ha^-1), and glyphosate (1,500 g ha^-1), besides an untreated control. The application was made when the plants were in the phenological stage V₃. The herbicides atrazine, glyphosate, [paraquat + diuron] and diquat showed the highest control levels of the volunteer soybean plants of the variety Conquista. The herbicides atrazine, [paraquat + diuron] and 2.4-D at the dose of 1,340 g ha^-1 were the most effective ones in controlling volunteer soybean plants of the cultivar Valiosa RR®. The susceptibility of the volunteer soybean plants from the conventional variety (Conquista) and the glyphosate-resistant variety (Valiosa RR^®) was variable depending on the applied herbicide.