Direct seeding is a technology that reduces the costs of forest restoration projects

and favors species which are difficult to establish for seedlings. The seeds osmotic treatment

to accelerate and standardize germination and induce tolerance to environmental stresses

may favor seedling establishment in field through direct sowing and contribute to the

greater efficiency of this technique. With the purpose of favor seed germination and seedling

establishment under direct seeding conditions in the field, Tabebuia roseoalba osmoprimed

seeds in polyethylene glycol (PEG) solution and unconditioned seeds were treated with

isolated and/or combined solutions of plant growth regulators (PGR) and rooting (RTG).

These seeds were submitted to germination test and evaluated for percentage germination

rate, germination speed index and normal seedlings, and to seedling emergence test by

direct field seeding. RTG had a toxic effect on T. roseoalba seeds. Osmoconditioning induced

stress tolerance by RTG during germination and on seedling establishment. PGR treatment

favors seedling emergence in field conditions and alleviates the toxicity effect caused by

RTG. These treatments have great potential for use in direct sowing of T. roseoalba seeds.