Brazilian Journal of Agriculture v.93, n.1, p. 80 – 92, 2018 80 FERTILIZER MAINTENANCE NITROGEN IN VEGETATIVE DEVELOPMENT AND PRODUCTION OF PEACH Letícia Vanni Ferreira 1 , Luciano Picolotto 2 , Michél Aldrighi Gonçalves 3 , Ricardo Alexandre Valgas 4 & Luis Eduardo Corrêa Antunes 4 1 Universidade Federal de Pelotas. E-mail: letivf@hotmail.com 2 Universidade Federal de Santa Catarina. E-mail: picolotto@gmail.com 3 Prefeitura de Canguçu, Rio Grande do Sul. E-mail: aldrighimichel@gmail.com 4 Embrapa Clima Temperado. E-mail: ricardo.valgas@embrapa.br; luis.antunes@embrapa.br ABSTRACT Nitrogen is the most important nutrient for the peach tree, especially in the growth and formation of plants. This work was conducted in the experimental area from Embrapa Temperate Climate, Pelotas, in the state of Rio Grande do Sul, Brazil, between the years 2012 and 2014. The local soil is classified as Yellow Red Argisol . The treatments consisted of three genotypes (‘BRS Kampai’, 'BRS Rubimel' and 'Cascata 805') and three nitrogen fertilizer maintenance doses (0, 100 and 200 kg ha -1 N), using as source the urea, compared in a split plot experimental design. The objective was to evaluate the effect of nitrogen fertilization maintenance on plant development, production and fruit quality of different genotypes of peach trees grown in high density planting. Maintenance nitrogen fertilization, at the doses tested in this study, does not influence the productive development of peach trees, but influences vegetative parameters, such as plant height and green pruning mass. Yet, the genotypes 'BRS Kampai', 'BRS Rubimel' and 'Cascata 805' affect in both the vegetative growth and the productive development of the peach tree. Keywords: Genotype plant nutrition, post-harvest, Prunus sp ADUBAÇÃO NITROGENADA DE MANUTENÇÃO NO DESENVOLVIMENTO VEGETATIVO E PRODUTIVO DE GENÓTIPOS DE PESSEGUEIRO RESUMO Os principais componentes de produção do pessegueiro são influenciados pelo nitrogênio. O trabalho foi conduzido na Embrapa Clima Temperado, Pelotas, RS, Brasil, entre os anos de 2012 a 2014.