Controle de plantas daninhas em trigo usando herbicidas em isolado ou em mistura em tanque

Abstract

Wheat is one of the most cultivated winter cereals in Southern Brazil, used for human and animal consumption. Uncontrolled weeds compete with wheat, causing significant losses in productivity and grain quality. Therefore, this study aimed to evaluate the effectiveness of herbicides applied either alone or in tank mixtures for controlling weeds infesting wheat crops, specifically the TBIO Duque cultivar. The experiment was conducted in a randomized complete block design with four replications. Treatments included 2,4-D (640 g ha-1), pinoxaden (50 g ha-1), terbuthylazine (750 g ha-1), saflufenacil (49 g ha-1), metsulfuron-methyl (3.96 g ha-1), applied alone or in tank mixtures, along with two controls one weeded and one infested totaling 24 treatments. Variables assessed included control of ryegrass and turnip at 7, 14, 21, 28, 35, and 42 days after treatment (DAT), plant density, spikes per area, spike length, filled and sterile grain count, hectoliter weight, thousand grain weight, and grain yield. Herbicide combinations such as saflufenacil + pinoxaden, 2,4-D amine + pinoxaden, metsulfuron-methyl + pinoxaden, saflufenacil + 2,4-D amine + pinoxaden, saflufenacil + metsulfuron-methyl + pinoxaden, and saflufenacil + 2,4-D amine + metsulfuron-methyl + pinoxaden + terbuthylazine in tank mixtures showed effectiveness in controlling ryegrass and turnip, weeds infesting the TBIO Duque wheat cultivar. Treatments containing 2,4-D amine generally resulted in the highest grain yield.