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Dichlorophenoxyacetic acid (2,4-D) is widely used in the selective, post-emergence control of narrow-leaf plants such as wheat, corn, and rice, among others. However, its uncontrolled use can cause problems in the development of the crop. The purpose of this paper was to evaluate the damage caused by the inadequate use of 2,4-D in the early development of soybean (Glycine max). The treatments consisted of a combination of five grace periods: 1, 4, 8, 12 and 15 days before sowing; and two application doses: the recommended dose and a duplicate dose (L/ha), consisting of a factorial matrix of 5x2, with three replicates. The plants were cultivated for 44 days, then collected and analyzed for germination rate (%), regrowth number, chlorophyll index, root and shoot length (cm), dry and fresh mass (g). The duplicate dose showed a greater effect on all analyzed variables, reducing the emergency percentage by 20%. The chlorophyll index decreased when compared to the shortest (1 day) and longest (15 days) grace periods, and in the duplicate dose. Dry mass was also higher when using the recommended dose, as well as the root and shoot length. Grace periods of 1, 4 and 8 days were the ones that were most influenced the root growth.

ATIVIDADE RESIDUAL E CARÊNCIA IRREGULAR DO ÁCIDO DICLOROFENOXIACÉTICO (2,4-D) NO DESENVOLVIMENTO INICIAL DA SOJA