Controle de plantas voluntárias de soja com herbicidas utilizados em milho - DOI:10.5039/agraria.v6i2a1032

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 dm 3 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 V 3 . 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.