28The aim was to evaluate the effect of seed treatment with plant growth regulators 29 and nitrogen fertilization methods in Brachiaria decumbens cv. Basilisk on the growth 30 and development through germinative characteristics, dry matter yield and physiological 31 composition. Plant growth regulators increased germination and mass yields of plant 32 structures in coated seeds. From the regression estimates, higher germination 33 percentages and root dry mass production were obtained with the use of Plant growth 34 regulators for the initial growth (10.3; 12.8 mL.kg -1 seed, respectively). Leaf and 35 pseudostem mass production had a significant interaction effect between seed type and 36 the use of growth regulator. Coated seeds had greater performance with absence or at 37 lower levels of growth regulators, and embryo quality contributed to the greater 38 formation of plant tissues. More efficient levels (8.85 and 9.57 mL.kg -1 seed) were 39 observed for the yields of plant structures (leaf and pseudostem). Soil N-fertilization 40 resulted in higher dry mass productions of leaf, stem, shoot and root, as well as for root 41 volume. Rates of photoassimilate were increased by soil fertilization and use of plant 42 growth regulators. The use of exogenous hormonal compounds acts on the 43 organogenesis of plant tissues and increases the development of Brachiaria decumbens 44 cv. Basilisk. Soil N-fertilization increase mass yields as it maximizes photosynthetic 45 processes and growth rates.46 47 3 50 Consequently, greater seed efficiency as regards germination and speed of emergence of 51 seedlings are necessary. Management practices are essential to improve herbage 52 production process using the climatic conditions that favor the development and use of 53 pasture. 54 The application of synthetic compounds as growth promoters in plants is based 55 on the effect similar to that of phytohormones. Phytohormones (auxins, gibberellins and 56 cytokinins) and the combination of these compounds regulate homeostasis [1]. The 57 PGR acts directly in the signaling network that, through intermediary metabolites, 58 activate genes and then plant responses, such as photosynthesis and the degradation of 59 monosaccharide and proteins. 60 Growth regulators can potentiate the performance of plants in stress-prone 61 environments, acting on biochemical reactions linked to plant growth. Applications of 62 PGRs based on gibberellic compounds at high levels of active principle per area are 63 shown to be an uneconomical pasture management tool, with reductions in forage mass 64 as application increases. Low concentrations of gibberellin (GA) of 5-10 g.ha -1 are 65 enough to positively affect forage yield [2]. 66 PGRs have demonstrated potential applications under stress conditions as they 67 act on the positive regulation of genes linked to the growth and development of plants, 68 increase mechanical impedance in dry soils and improve water use [3]. The use of 69 growth regulators can be applied as an effective technique in plan...