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An experiment was conducted to evaluate the effect of plant spacing and nitrogen fertilization on Swiss chard's yield, from September to November 2009. The experimental design was of randomized blocks in split plot with four replications. In the plots were allocated the two plant spacings (0.30 and 0.50 m) and in the subplots the five doses of nitrogen (0, 40, 80, 120 and 160 kg ha-1). The crop was harvested 90 days after transplanting. The plant spacing of 0.50 m provided increased production of total fresh weight of shoot (961.7 g plant-1) and marketable (873.1 g plant-1). However, the highest total yield (77.8 t ha-1) and marketable (64.5 t ha-1) was achieved with the smaller spacing between plants (0.30 m). The N rates applied in coverage until 160 kg ha-1 increased in a linear form the total and marketable production of fresh mass of shoots, the total and marketable yield, the N content and the N accumulation in the shoots of Swiss chard plants on the evaluated plant spacings. Avaliou-se o efeito do espaçamento entre plantas e da adubação nitrogenada na produtividade de acelga, de setembro a novembro de 2009. O delineamento experimental adotado foi de blocos ao acaso em parcelas subdivididas com quatro repetições. Nas parcelas foram alocados dois espaçamentos entre plantas (0,30 e 0,50 m) e nas subparcelas cinco doses de nitrogênio em cobertura (0; 40, 80, 120 e 160 kg ha-1). A colheita foi realizada 90 dias após o transplante das mudas. O espaçamento entre plantas de 0,50 m proporciona maior produção de massa fresca da parte aérea total (961,7 g planta-1) e comercial (873,1 g planta-1) por planta. Porém, a maior produtividade total (77,8 t ha-1) e comercial (64,5 t ha-1) foi obtida com o menor espaçamento entre plantas (0,30 m). As doses de N aplicadas em cobertura até 160 kg ha-1 incrementam de forma linear a produção de massa fresca da parte aérea total e comercial, a produtividade total e comercial, o teor de N e o N acumulado na parte aérea das plantas de acelga nos espaçamentos avaliados

Plant density and nitrogen fertilization in Swiss chard