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EnglishThe introduction of dicamba and 2,4-D-resistant soybean will increase the use of auxin herbicides for management of herbicide-resistant weeds, increasing risk of drift in non-target crops. The field experiment was conducted in 2016/17 to evaluate injury, growth, yield, germination and seeds vigor of soybean effects to simulated drift of 2,4-D and dicamba applied to soybean at the V3 and R2 growth stages. To simulate drift, 2,4-D was applied at 0; 5.16; 10.4; 20.8 e 41.5g ae ha-1 and dicamba at: 0; 3.7; 7.4; 14.9 e 29.8g ae ha-1. The injury of the dicamba is greater than 2,4-D, and the V5 stage is more susceptible to both herbicides. The greatest reductions in soybean yield follow the drift of dicamba in R2 and 2,4-D in V5. The physiological quality seeds of the soybean is reduced by dicamba and 2,4-D drift at both the V5 and R2 stages of the soybean. Soybean is highly sensitive to low rates of 2,4-D and dicamba at the vegetative or reproductive growth stages. Dicamba causes greater negative effects than 2,4-D on soybean. The low rate of 2,4-D and dicamba reduce germination and vigor seed on soybean offspring. Key words: dose response; injury; germination; vigor; synthetic auxin portuguesA introducao de cultivares resistentes ao dicamba e 2,4-D aumentara o uso destes herbicidas para o manejo de ervas daninhas resistentes a herbicidas, aumentando o risco de deriva em culturas nao-alvo. Assim, o objetivo do trabalho foi avaliar a fitotoxicidade, crescimento, produtividade, germinacao e vigor de sementes de soja exposta deriva simulada de 2,4-D e dicamba nos estagios vegetativo e reprodutivo da soja. O experimento foi conduzido a campo na safra 2016/17. Para simular a deriva, 2,4-D foi aplicado nas doses de 0; 5,16; 10,4; 20,8 e 41,5g e.a. ha-1 e dicamba nas doses de 0; 3,7; 7,4; 14,9 e 29,8g e.a. ha-1. A fitotoxicidade de dicamba e maior que 2,4-D, sendo o estagio V5 mais suscetivel para ambos herbicidas. As maiores reducoes na produtividade da soja sucedem a deriva de dicamba em R2 e 2,4-D em V5. A qualidade fisiologica das sementes de soja e reduzida em funcao da deriva de dicamba e 2,4-D em aplicacao nos ambos estagios V5 e R2 da soja. A soja e altamente sensivel a baixas concentracoes de 2,4-D e dicamba nos estagios vegetativo e reprodutivo. O dicamba causa maiores efeitos negativos comparado com 2,4-D. Baixas concentracoes de 2,4-D e dicamba reduzem germinacao e vigor de sementes de soja. Palavras-chave: dose resposta; fitotoxicidade; germinacao; vigor; herbicidas auxinicos.

Drift of 2,4-D and dicamba applied to soybean at vegetative and reproductive growth stage