There is some doubt about the influence of seed size among soybean producers, who often believe that larger seeds produce more vigorous plants. There is also some debate regarding the furrow opener, as it influences the depth of the fertilizer in relation to the seed. This study aimed to evaluate seeding parameters and the development and productivity of the soybean in regard to seed size and employing fertilizer furrow opener. The experiment was conducted in a typical distroferric red nitisol

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... ith very clayey texture in two crop seasons 2014/2015 and 2015/2016. The experiment adopted a randomized block design in a factorial structure, with five replications. Treatments consisted of the combination of two seed sizes of Nidera ® NS 4823 RR cultivar (large -6.5 mm, and small -5.5 mm in diameter) and two types of furrow opener (shank and double disc). The use of shank-type furrower resulted in a greater mobilized area and a greater sowing depth in both seasons. Due to environmental conditions, smaller seeds resulted in lower plants, 30 days after sowing and fewer pods per plant in the first studied season. In turn, seeds with larger diameter resulted in higher productivity in the second season, although in the first year there was no significant difference.