The aim of this study was to evaluate the selectivity of the herbicide halosulfuron-methyl in cotton when applied in desiccation before seeding. Two trials were conducted under green-house conditions in a completely randomized design with four replications. The treatments corresponded to four periods between herbicide application and seeding (0, 7, 14 and 21 days) and a control without application. The soils used as substrate in each experiment were classified as sandy and sandy clay loam. The evaluations made were: plant height at 7, 14, 21 and 28 days after emergence (DAE); stem diameter, leaf area, root volume, dry mass of aerial parts and roots at 28 DAE. It was possible to conclude that halosulfuron-methyl applied up to 14 days before sowing was not selective to cotton.
herbicide; sulfonylurea; tolerance; Gossypium hirsutum
