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Volunteer soy is a problem in maize cultivation, interfering with its development and growth. The objective of this work was to evaluate the efficiency of herbicides used in maize for the control of volunteer soybean plants in two phenological stages. The experiment was conducted in a greenhouse, in a completely randomized experimental design in factorial 2 x 11, having as factors two phenological stages and eleven herbicides spray, with four replications. The herbicides spray were composed by: nicosulfuron (40 g ha-1 i.a.); tembotrione (75 g ha-1 i.a.); mesotrione (480 g ha-1 a.i.); atrazine (500 g ha-1 a.i.); 2.4-D (806 g ha-1 a.i.); dicamba (480 g ha-1 a.e.); glufosinate-ammonium (200 g ha-1 a.i.); atrazine + Tembotrione (500 + 75 g ha-1 i.a.); atrazine + mesotrione (500 + 480 g ha-1 a.i.); atrazine + nicosulfuron (500 + 40 g ha-1 i.a.), in addition to a control without application. Visual evaluations were realized at 07, 14, 21, 28 and 35 (DAA) days after application, to determine the control of the voluntary soybean. The results indicate that in both phenological stages, the herbicides mesotrione, nicosulfuron, tembotrione and 2,4-D did not present total control of the soybean. Glufosinate ammonium, atrazine isolated or associated with mesotrione, nicosulfuron and tembotrione 100% controlled the soybean plants from 7 DAA. Dicamba presented total control, in the phenological stage V1 and V3, from 7 DAA and 14 DAA, respectively.

Herbicidas utilizados em milho no controle de soja voluntária