Resumo -Objetivou-se, com este trabalho, avaliar o efeito da taxa de aplicação e do uso de adjuvante sobre o controle de plantas daninhas e deposição dos herbicidas ioxynil + clethodim em plantas de cebola. O experimento consistiu em seis tratamentos com cinco repetições, arranjados em esquema fatorial 2 x 3, ou seja, a combinação de dois níveis de adjuvante (com e sem) com três taxas de aplicação (100, 150 e 200 L ha -1 ). Os tratamentos foram aplicados em pós-emergência, após o enraizamento da cebola e quando as plantas daninhas se apresentavam no estádio de quatro a seis folhas. Os tratamentos não promoveram fitotoxicidade na cultura da cebola. Houve tendência de melhoria no controle de Cyclospermum leptophyllum e Polygonum persicaria com o uso do adjuvante, contudo não houve significância. A deposição de calda não foi afetada pela taxa de aplicação e pelo uso de adjuvante. Conclui-se que o uso de adjuvante e a redução da taxa de aplicação não comprometeram a eficiência e a deposição dos herbicidas ioxynil + clethodim. Palavras-chave: Cyclospermum leptophyllum, óleo mineral, Polygonum persicariaAbstract -The objective, of this work, was evaluated the effect of carrier volume and use of activator adjuvant on the weed control and deposition of herbicide treatment with ioxynil + clethodim in onion plants. The experiment consisted by six treatments and five replications, organized in factorial scheme 2 x 3, that is a combination of two levels of adjuvant (with an without) with three application rates (100, 150 e 200 L ha -1 ). The treatments were applicate in post-emergence, after the onion rooted in and the weeds were four to six leaves stage. The treatments not promote intoxication in onion crop. There are the tendency to improve Cyclospermum leptophyllum and Polygonum persicaria control with adjuvant use, however without significate effect. The control level and deposition were not affect for application rate evaluated. Concluded that reduced application rate no compromised the efficiency and deposition of ioxynil + clethodim herbicides.
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