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RESUMO - O trabalho teve como objetivo determinar o efeito da adubacao nitrogenada de cobertura sobre a comunidade infestante e sobre os periodos de interferencia das plantas daninhas na cultura do sorgo granifero ‘882’, em sistema convencional. Foram estudados os periodos de convivencia e controle de 0, 7, 14, 32, 42, 57, 72 e 118 dias apos a emergencia (DAE), totalizando dezesseis tratamentos, dispostos em blocos casualizados, com quatro repeticoes, em dois niveis de adubacao, 0 e 70 kg ha-1 de N. A adubacao nao alterou a composicao da comunidade infestante, destacando-se Raphanus raphanistrum, Cyperus rotundus, Alternanthera tenella e Amaranthus ssp. como as especies de maior importância relativa. Os periodos criticos de prevencao da interferencia (PCPI) do sorgo ‘822’ com e sem adubacao foi de 4 aos 72 e 7 aos 90 DAE, respectivamente. A interferencia das plantas daninhas reduziu em 31 e 26% a produtividade estimada de 6859,5 e 6417,1 kg ha-1 de graos do sorgo na presenca e na ausencia da adubacao nitrogenada, respectivamente, sendo que adubacao nitrogenada realizada aos 45 dias apos a emergencia da cultura aumentou em 7% a sua produtividade. Palavras-chave: Sorghum bicolor , competicao, nitrogenio. WEED INTERFERENCE PERIODS ON GRAIN SORGHUM CROP WITH AND WITHOUT NITROGEN FERTILIZATION ABSTRACT - The aim of this work was to determine the effect of nitrogen fertilization on the weed community and on the periods of interference of weeds in the ‘882’ grain sorghum in a conventional system. The periods of coexistence and control were 0, 7, 14, 32, 42, 57, 72 and 118 days after emergence (DAE), totaling sixteen treatments, arranged in randomized blocks, with four replications, at two levels of fertilization, 0 and 70 kg ha-1 of N. Fertilization did not change the composition of the weed community, with the species Raphanus raphanistrum, Cyperus rotundus, Alternanthera tenella and Amaranthus ssp. being the most important at all levels of fertilization. The critical periods of interference prevention (CPIP) of sorghum ‘822’ with and without fertilization were 4 at 72 and 7 at 90 DAE, respectively. Weed interference reduced the estimated yield of 6859.5 and 6417.1 kg ha-1 of sorghum grains by 31 and 26% in the presence and absence of nitrogen fertilization, respectively, and nitrogen fertilization done at 45 days after the emergence of the crop increased its productivity by 7%. Keywords: Sorghum bicolor , competition, nitrogen.

PERÍODOS DE INTERFERÊNCIA DE PLANTAS DANINHAS NO CULTIVO DE SORGO GRANÍFERO, COM E SEM ADUBAÇÃO NITROGENADA DE COBERTURA