This work aimed to evaluate the efficacy of combining the herbicides fomesafen, fluazifop-p-butyl and bentazon for integrated weed management in bean culture (no-tillage and conventional tillage), in areas previously cultivated with maize for grain and silage. Fomesafen residue in the soil was also evaluated at 125 days after application (DAA). In the conventional tillage, Cyperus rotundus was the dominant species, while under no-tillage, infestation of this species was very low. None of the herbicide combinations was efficient in controlling C. rotundus. Except for fluazifop-p-butyl + bentazon (125 + 480 g ha-1), all the combinations were efficient in controlling the dicotyledonous weed species. The herbicide treatments had no effect on bean productivity. Fomesafen, applied under no-tillage, caused toxicity to the bean culture after the dose of 100 g ha-1, especially to silage corn. Under the conventional tillage, milder symptoms were only observed at the dose of 200 g ha-1. Fomesafen residue was found in the soil only in the no-tillage area without straw on the soil surface, in the area previously cultivated with maize for silage. Fomesafen doses can be reduced when mixed with bentazon without affecting bean productivity. In areas where bean was cultivated after maize harvest for silage, it is important to use small doses of fomesafen to prevent subsequent toxicity of sensitive cultures.
no-tillage; soil management; weeds; Phaseolus vulgaris
