ResumoO uso de altas doses de adubação nitrogenada, associado à aplicação de redutores de crescimento, pode ser uma alternativa para que plantas de trigo consigam expressar potencial produtivo elevado sem a ocorrência de acamamento. Por este motivo, o objetivo deste trabalho foi avaliar o efeito do redutor de crescimento trinexapac-etil associado à adubação nitrogenada elevada e parcelada no rendimento e seus componentes em plantas de trigo da cultivar BRS 220. O delineamento experimental foi de blocos ao acaso com dois tratamentos e quatro repetições, compostos da aplicação de 110 kg de N ha -1 associados ou não a 0,4 g L -1 de trinexapac-etil. Foram avaliados rendimento e seus componentes, diâmetro de colmo, comprimento de entrenó, altura de planta e comprimento do colmo. As médias foram submetidas ao teste-t de Student no programa Systat 13 ® . A aplicação do redutor de crescimento contribuiu com um aumento significativo no rendimento e no diâmetro do colmo das plantas, além da redução da altura, comprimento do colmo e do entrenó, quando comparado com o tratamento sem a aplicação do produto.Palavras chave:Nitrogênio, redutor de crescimento, Triticum aestivum. Trinexapac-ethyl effect associated with high and split fertilization on wheat productivity cultivar BRS 220 AbstractThe use of high nitrogen doses, associated with the application of growth reducers, can be an alternative to wheat plants express high productive potential without the occurrence of lodging. For this reason, the aim of this study was to evaluate the effect of trinexapac-ethyl growth reducer associated with high and split nitrogen fertilization on yield and its components in wheat cultivar BRS 220. The experimental design was randomized blocks with two treatment and four replications, compose with the application of 110 kg N ha -1 with or without 0,4 g L -1 of trinexapac-ethyl. It was evaluated yield and its components, stem diameter, length of internode, plant height and stem length and the averages were submitted to Student t-test using Systat 13 ® . The application of the growth retardant contributed to a significant increase in yield and stem diameter of the plants, besides the reduction of height and length of stem and internode, when compared to the treatment without product application.
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