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This paper has the objective to evaluate the influence of seed densities and sowing season in conventional soybean genotype and Roundup ReadyTM (RR), in the morphological characteristic of soybean plant. The experiments were conducted in Jari-RS, Brazil. The first seeding was done within the time prescribed for the crop(November), and the second, after the time indicated (January), with the cultivars 'CEP/CD 41', 'CD 201', 'Fundacep 39', 'Fundacep 44', 'CD 205', 'BRS 133', 'Fundacep 45', 'A 6001 RG', 'Mágica, AL72' and A '8100 RG', at densities of 250, 400 and 550 thousand seed seeds suitable ha-1 in the 2005/2006 harvest. The experiment design was randomized blocks with split plots, with four replications. The cultivars cycle, plant height, height of first pod insertion, number of branches plant-1, branches m-2, nodes' number of the main stem plant-1, nodes main stem m-2, biological yield (RB) and harvest index (IC). Sowing in January causes reduction in the crop cycle, plant height, height of first pod insertion, number of nodes plant-1 and RB and the increase in seed density not increased the height of first pod insertion in RR cultivars. The period cycle that is most affected by the delayed sowing is the vegetative. The IC sowing in November was lower, but the RB was larger. [ABSTRACT FROM AUTHOR]