The objective of this work was to evaluate Brachiaria brizantha intercropped with BRS Valente and Diamante Negro bean cultivars under reduced rates of fluazifop-p-butyl. The experiment was conducted in a randomized complete block arrangement, with four replications, in a split-plot design. The bean cultivars intercropped with B. brizantha constituted the plot (Diamante Negro and BRS Valente) and the doses of fluazifop-p-butyl the split-plots. B. brizantha and the bean cultivars were evaluated in monocrop kept clean by hand hoeing. Final stand, grain yield, 100-seed weight, number of pods per plant and number of seeds per pod of bean cultivars were evaluated. B. brizantha was collected 25 days after BRS Valente cultivar harvest, evaluating aerial dry biomass of the aerial part and canopy height. BRS Valente and Diamante Negro, were not affected by B. brizantha intercrop; it was observed that BRS Valente cultivar (1.80 t ha-1) was more adequate for this planting timing, in relation to Diamante Negro cultivar (1.31 t ha-1). Bean plants were very competitive with B. brizantha reducing forage dry biomass of 50% relative to B. brizantha monocrop. Intercrop without herbicide compared to 15 g ha-1 of fluazifop-p-butyl showed that the treatment with herbicide reduced in 12 and 13% the dry biomass and canopy height, respectively. Above 21 g ha-1 of fluazifop-p-butyl, the forage showed highly susceptible to the herbicide, presenting an extremely reduced biomass accumulation.
Phaseolus vulgaris; Brachiaria; herbicide; crop-livestock integration; no-till
