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RESUMO - O manejo adequado da adubacao nitrogenada para atenuar efeitos da perda de area foliar e uma solucao pouco explorada. Portanto, objetivou-se avaliar, em campo, o efeito da reaplicacao de nitrogenio e intensidade de desfolha em diferentes fases fenologicas sobre a incidencia de graos ardidos e o desempenho produtivo do milho. O delineamento experimental foi em blocos casualizados, com quatro repeticoes, em esquema fatorial 2x7x4+2, sendo, a reaplicacao de N em cobertura (0 e 40 kg ha-1), os estadios fenologicos de desfolha (V2, V4, V6, V10, R1, R3 e R5), as intensidades de desfolha (25, 50, 75 e 100%) e dois controles adicionais (0% de desfolha com e sem a reaplicacao de N). As avaliacoes realizadas foram percentagem de graos ardidos, massa de 100 graos e produtividade de graos. Os dados foram submetidos a analise de variância, testes de Tukey, Dunnett e regressao ate 2o grau (p<0,05). A reaplicacao de nitrogenio apos a desfolha atenua os efeitos desse estresse na massa e no rendimento total de graos, com maior efetividade quando ocorre nos estadios vegetativos. O prejuizo ao desempenho produtivo em razao da desfolha e acentuado quando ocorre no florescimento e enchimento de graos, pois desequilibra a relacao fonte-dreno. A desfolha em estadios iniciais proporciona maior intensidade de graos ardidos nas plantas de milho. Palavras-chave: Adubacao nitrogenada, Area foliar, Estadios fenologicos, Zea mays L. REAPPLICATION OF NITROGEN AS MITIGATION TO THE DEFOLIATION EFFECT AT STAGES OF MAIZE ABSTRACT - The proper management of nitrogen fertilization to mitigate the effects of the loss of leaf area is poorly explored. Therefore, the present study evaluated the effect of nitrogen reapplication and defoliation intensity at different phenological stages on the incidence of rot grains and corn production performance. The experimental design was a randomized complete block with four replications, in a 2x7x4 + 2 factorial scheme, with the reapplication of N topdressed (0 and 40 kg ha-1), the defoliation stages (V2, V4, V6, V10, R1, R3 and R5), defoliation intensities (25, 50, 75 and 100%) and two additional controls (0% defoliation with and without reapplication of N). Percentage of rot grains, mass of 100 grains and grain yield were evaluated. Data were subjected to analysis of variance, Tukey’s, Dunnett’s tests and regression up to grade 2 (p <0.05). Reapplication of nitrogen after defoliation attenuates the effects of this stress on the mass and the total yield of grains, with greater effectiveness in the vegetative stages. The damage to the productive performance due to defoliation was accentuated when occurred at the flowering and grain filling as it unbalances the source-drain relation. Depletion in the early stages caused higher occurrence of grain burned in maize plants. Keywords: Nitrogen fertilization, Leaf area, Phenological stages, Zea mays L.

REAPLICAÇÃO DE NITROGÊNIO NA MITIGAÇÃO DO EFEITO DA DESFOLHA EM DIFERENTES FASES FENOLÓGICAS DO MILHO