The pinho-cuiabano species occurs in high lands of the Amazon. Its wood is used for
boxes, plywood and toys. This species is very important for reforestation, because it has fast growth.
However, besides the lack of seeds in quantity and quality, the germination does not occur due the
dormancy. For small seed quantity, the manual scarification of the seedcoat can be used. By the other
side for big quantities of seeds, more than 10kg, other methods for breaking dormancy must be developed.
As the pinho-cuiabano seeds do not support hot or boiled water treatments, one experiment testing the
scarification with sulphuric acid was conducted. The seeds were harvested in the Nacional Forest of
Jamari, situated in the Jamari county, Rondônia State. The treatments were the immersion of the seeds
in pure sulphuric acid for periods from four to 30 minutes. After each treatment period, the seeds were
washed in water and sowed in sterilizad soil in greenhouse. The germination porcentage were obtained
35 days after sowing. The experimental design was completely randomized plots with four replications
of 100 seeds each one. It was concluded that the seedcoat dormancy of the pinho-cuiabano seeds is
broken by using the immersion of the seeds in pure sulphuric acid for 16 minutes.