Herbicide performance in weed control in corn silage.

In Santa Catarina, the production of grains of maize shares space with the production of corn silage, which is used in cattle as forage for cattle food. In this sense, it is important to search for alternatives that minimize the loss of productivity, among them, reduce competition caused by weeds that affect the biomass accumulation. The objective was to evaluate the efficiency of Primóleo® (atrazine) and Callisto® (mesotrione) herbicides in the control of weeds in corn silage in two seasons of crops. The tests were arranged in a randomized block design, in 4x2 factorial design (different types of control and different vintages). The treatments were applications of atrazine and mesotrione herbicides, mechanical weeding and the witness. For the application, it was carried out the survey of the population of weed all plots with an area of 12 square meters each. After, with the applied treatments, it was made visual assessments of control efficiency at 14, 21 and 28 days after application, where atrazine was more efficient than the mesotrione. Other variables analyzed were: productivity, ear height and ear yield.Through these, it was found that mechanical weed control is more efficient than chemical control, and no significant difference between maize yield using the mesotrione and atrazine herbicides regardless of the growing season.