Nitrogen fertilization is an important management practice in grasses and quite complex, due to the different factors that influence such as climatic conditions, cropping systems, rates and available sources. The objective of this work was to evaluate the different rates of side dressing nitrogen and the effect of the trinexapac-ethyl on wheat (Triticum aestivumL.).The experiment was a randomized block design in a 5x2 factorial scheme, with 4 replicates. The treatments were composed of five nitrogen rates applied in side dressing(0, 20, 40, 80 and 160 kg ha-1of N) and two rates ofetil-trinexapac (0 e 100 g ha-1do active ingredient)in the wheat crop.The following variables were evaluated: shoot dry matter, plant height, flag leaf height, ear insertion height, distance of source and drain, ear length, number of ears per square meter, number of spikelets per ear, fertility of spikelets, number of grains per ear, number of grains per spikelet, mass of one thousand grains, grain yield), hectoliter weight, and grain protein. The growth regulator changes the morphological components of wheat, but does not alter the productive components and yield of grains, not justifying their use under the conditions under which the study took place. Nitrogen fertilization does not alter the morphological components of wheat plants, but increases the number of ears per m2up to a rate of 52 kg ha-1of N, reflecting the increase in productivity up to the rate of 59 kg ha-1.