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This research aimed to study different herbicides applied in the sugarcane culture during the rainy season. The experiment was established in a 3rd ratoon crop of cultivar SP84- 2025 and planted in a soil with 49.9% clay, 36.6% sand and 13.5% silt. The experimental design was a randomized block in a split-plot scheme with experimental units consisting of five sugarcane interrows with 5 m, spaced 1,5 m (37.5 m2 ) and sub-plots with one cane row of 5 m (7.5 m2 ). Seeds of Ipomoea quamoclit, Ipomoea hederifolia, Merremia cissoides, Panicum maximum and Brachiaria decumbens were sown in the sub-plots and untreated control. The herbicides evaluated were imazapic (147 g ha-1), imazapic (98 g ha-1) + sulfentrazone (600 g ha- 1 ), sulfentrazone (800 g ha-1), tebuthiuron (1000 g ha-1), amicarbazone (1400 g ha-1), flumioxazin (125 g ha-1), diuron (1066 g ha-1) + hexazinone (134 g ha-1) + imazapic (98 g ha-1), amicarbazone (840 g ha-1) + isoxaflutole (82.5 g ha-1), imazapic (98 g ha-1) + isoxaflutole (85 g ha-1) and applied at pre-emergence of the crop and weeds. During the 120 days following spraying, 698.7 mm of rainfall was observed, the average minimum and maximum temperature being 21.9 and 30.6 °C, respectively. The herbicides that were more persistent and better control on the species studied in the following descending order: amicarbazone (91.2% control), imazapic (90.8%), imazapic + sulfentrazone (89.6%), amicarbazone + isoxaflutole (89.2%), imazapic + isoxaflutole (85.6%), diuron + hexazinone + imazapic (84.4%), tebuthiuron (76%), sulfentrazone (70.8%), flumioxazin (19.2%). |
