Management of Digitaria insularis Sprouts Under No-Till Corn Cultivation

Total weed control is not always possible tinder no-till desiccation leading to perennial and and increased number of weeds. In no-till cultivation areas with predominant occurrence of Digitaria insularis sprouts, nicosulfuron alone (60 g ha(-1)) and in tank mix with atrazine (40 + 1.500 g ha(-1)) foramsulfuron + iodosulfuron-methyl (45 + 3 g ha(-1)) and mesotrione in tank mix with atrazine (144 + 1.500 g ha(-1)) were tested in a randomized block design, with four replications. Each plot was 6 x 4 m, containing six corn culture rows. The herbicides were applied with a back spray at a constant pressure of 30 lbf pol(2), using 200 L ha(-1) solution. Herbicide efficacy and toxicity were evaluated at 7, 15 and 30 days after application. During harvest, reinfesting plant cover and its degree of mechanized harvest were assessed, as well as culture yield. It can be inferred that the best control of D. insularis sprouts Was obtained with nicosulfuron alone at 60 g ha(-1).