This work aimed to evaluate the effects of green cane harvesting residue and of the herbicide mixture trifloxysulfuron sodium + ametryne on the emergence and dry biomass accumulation of nine weed species. The treatments were arranged in a 3 x 3 factorial design, with three green cane harvesting residue amounts (0, 10 and 15 t ha-1) and three rates of the commercial formulation of the herbicide mixture trifloxysulfuron sodium + ametryne (0, 1.75 and 2.00 kg ha-1), applied under weed post-emergence conditions. Weed density was evaluated at 15, 60 and 90 days after herbicide application (DAA) and weed dry biomass at 90 DAA. The presence of the green cane harvesting residue on the soil suppressed the density of the populations of Brachiaria plantaginea, Digitaria horizontalis, Panicum maximum, Sida glaziovii and Amaranthus hybridus. The green cane harvesting residue reduced the populations of Senna obtusifolia, Ipomoea hederifolia, I. grandifolia and I. nil, even though the control was not satisfactory. The herbicide mixture studied controlled all the weed species evaluated. In the presence of green cane harvesting residue, the control of S. obtusifolia, I. nil, I. hederifolia and I. grandifolia was satisfactory only when the herbicide mixture was applied.Green cane harvesting residue combined with the herbicide mixture was advantageous for P. maximum control, compared with applying the smallest amount of green cane harvesting residue or the herbicide mixture alone on the soil surface.
Saccharum spp.; mulching; chemical control
