Plants of Zea Mays L. cv. 'Piranão' were treated, 15 and 22 days after seeding, with (2-cloroethyl) trimethylammonium chloride (2000 ppm), gibberellins (100 ppm), beta-naphthoxyacetic acid (100 ppm) and 3-indoleacetic acid (100 ppm). The morphological characteristics and yield were verified. The experiment was carried out under field conditions, in Piracicaba, São Paulo. The effective treatment were obtained with gibberellins in concentration of 100 ppm, which promotes an increase in the plant height. There were no statistical significant differences between treated and untreated plants with respect to the morphology and yield of maize, with the applicatin of CCC, BNOA and IAA. Some characteristics of the cultivar 'Piranão' during the development of the plant and at harvest were also verified. Samples were analyzed for macronutrients, collected at four different stages of growth.