The objective of this work was to evaluate the effects of nicosulfuron and atrazine mixture on weeds, corn and Brachiaria decumbens intercrops, cultivated under no-tillage and conventional tillage. Six nicosulfuron doses (0, 2, 4, 8, 16 and 24 g ha-1) in mixture with atrazine in the dose of 1.500 g ha-1 were evaluated, plus two controls, represented by both species in monocrop. Seminiferous propagation of the annual weeds was efficiently controlled by applying nicosulfuron in 8 g ha-1 in mixture with atrazine, regardless of the management systems. The perennial species (Artemisia verlotorum and Cyperus rotundus), of vegetative propagation, were not controlled by the herbicide mixture, regardless of the applied dose. Larger infestations of these species were observed under the conventional system. B. decumbens biomass was reduced in the intercrop with corn, when compared to its control in monocrop, presenting a greater reduction when submitted to the largest doses of nicosulfuron, in both planting systems. No difference was observed in the production of grains and corn straw, in function of the treatments studied, under both planting systems.
management systems; nicosulfuron; atrazine
