The purpose of this work was to evaluate the effects of side-dressing of nitrogen fertilizer after weeding in different periods on bean culture (Phaseolus vulgaris L.) of three types of growth habits, during the "dry" crop season. Number of pods per hectare (NPH) was the primary production component which was most harmed by weed competition throughout the life cycle of 'Ouro'and 'Ouro Negro'. In all the experiments the different weeding delays increased actual weed side-dressing which decreased GP and NPH in the presence of side-dressing application of nitrogen. In the three cultivars, side-dressing application of nitrogen fertilizer increase GP, NPH and 100 grain weight (100GW) as well as the number of grains per pod (NGP) in 'Novo Jalo'. When side-dressing application of nitrogen fertilizer was done immediately after weeding delayed 10 d, in relation to the total period of interference prevention (30 d for bean culture), it was not capable of provinding total recovery of the beans productive capacity.
Phaseolus vulgaris; weed; nitrogen