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RESUMO – Este trabalho foi conduzido objetivando avaliar a resposta do milho ao incremento na densidade de plantas, sob diferentes espacamentos entre linhas. O experimento foi implantado em Lages-SC, nos dias 20/10/2014 e 21/10/2015. Foram testadas cinco densidades de plantas (3, 5, 7, 9 e 11 pl m-2) e dois espacamentos entre linhas (40 cm - reduzido, e 80 cm - convencional). Avaliaram-se caracteristicas fenologicas, morfologicas, fisiologicas e a produtividade em kg de graos ha-1 do hibrido P30R50H. Os dados foram analisados estatisticamente pelo teste F, e as medias foram comparadas pelo teste de Tukey e analise de regressao. A produtividade variou de 11.390 a 18.760 kg ha-1, dependendo do arranjo de plantas testado. Ele aumentou linearmente 923 e 724 kg ha-1 para cada planta adicionada por m-2 no espacamento entre linhas de 40 cm em 2014/2015 e 2015/2016, respectivamente. A elevacao na densidade de plantas de 3 para 11 pl m-2 nao promoveu assincronia floral, nao reduziu a atividade fotossintetica da folha indice, nem aumentou a percentagem de plantas acamadas, quando se utilizou o espacamento entre linhas reduzido. Portanto, a utilizacao de densidades supraotimas (9 e 11 pl m-2) e espacamento entre linhas reduzido (40 cm) foram estrategias de manejo efetiva para otimizar a produtividade do milho. Palavras-chave: Zea mays, densidade, espacamento entre linhas, rendimento. MANAGEMENT OF PLANT ARRANGEMENT TO OPTIMIZE GRAIN PRODUCTIVTY IN MAIZE ABSTRACT – This work was set aiming to evaluate maize response to the increase in plant population at different row spacings. The experiment was conducted in Lages, SC, South of Brazil, on 10/20/2014 and 10/21/2015. Five plant densities (3, 5, 7, 9 and 11 plants m-2) and two row spacings (40 cm – reduced; 80 cm – conventional) were tested. Phenological, morphological and physiological traits, productivity (kg of grains per ha-1) of the hybrid P30R50 were evaluated. Data were assessed by the F test and means were compared by the Tukey’s test and regression analysis. Grain productivity ranged from 11,390 to 18,760 kg ha-1, depending on the plant arrangement. Linear increase of 923 and 724 kg ha-1 was observed for each added plant per m-2 at the row spacing of 40 cm, in 2014/2015 and 2015/2016, respectively. The increase in plant density from 3 to 11 plants m-2 did not promote flower asynchrony, did not reduce photosynthetic activity of the index leaf, neither enhanced the percentage of lodged plants when the reduced row spacing was used. Therefore, the use of supra-optimum plant densities (9 and 11 plants m-2) and reduced row spacing (40 cm) were efficient strategies of plant arrangement management to optimize maize grain productivity. Keywords: Zea mays, density, row space, productivity.

ESTRATÉGIAS DE MANEJO DO ARRANJO DE PLANTAS VISANDO OTIMIZAR A PRODUTIVIDADE DE GRÃOS DO MILHO