Excessive vegetative growth has been verified in cotton when associated with high N doses in favorable climatic regions, justifying the utilization of growth regulators that promote higher productivity and adequate canopy to mechanization. The objective of this study was to evaluate the productivity and cotton growth submitted to mepiquat chloride and N doses. For that, the experimental design was a complete block in a factorial of 4x2, with four nitrogen doses (0, 60, 120 e 180 kg ha-1) with and without mepiquat chloride (50 g ha-1). The growth regulator mepiquat chloride was utilized at 40, 60 ad 80 days after plant emergence with 12,5 g ha-1, 17,5 g ha-1 e 20 g ha-1, respectively. It was verified that N doses increased cotton boll mass, 100-seeds mass and yield. The application of the growth regulator reduces plant size and it promotes increments of yield by 12%. The dose of 131 kg ha-1 N allowed obtaining the largest productivity (3.633 kg ha-1). There was no influence of the growth regulator and of the N fertilizer on productivity index and precocity.
Gossipium hirsutum; grown regulator; plant height; productivity
