Superação de dormência e armazenamento de sementes de Mimosa flocculosa Burkart

Abstract

This work aimed evaluated the efficieny diferent methods to overcome dormancy of Mimosa flocculosa Burkart. (bracatinga de campo mourão) and influence storage time of its physiological quality of submitted or not overcome dormancy seeds. The work was divided into two studies: the first, seeds were treated to overcome dormancy: immersion in H2SO4 (15 min) and (1 min); immersion in H 2 O at 100 °C (1 min) (5 min) (10 min) (15 min); immersion in H 2 O at 80 °C (1 min) (15 min); scarification with sand at 400 rpm (1 min) to 800 rpm (1 min); immersion in smoke water (24 h); oven at 120 °C (5 min); immersion in H 2 O at 100 °C (15 min) + atmosphere (24 h); immersion in H 2 O at 100 °C (1 min) environment (24 h); immersion in H 2 O at 100 °C (5 min) + atmosphere (24 h); immersion in H 2 O at 100 °C (5 min) + oven at 32 °C (24 h); immersion in H 2 O at 100 °C (10 min) + atmosphere (24 h) immersion in H 2 O at 100 °C (10 min) + oven at 32 °C (24 h). In the second study, seeds were treated to overcome dormancy and stored during 360 days whith evaluation every 45 days. Used the germination test, with evaluations of germination normal and abnormal seedlings and dead seeds and hard. The evaluations were germination, accelerado ageing, emergency speed index, emergency speed, length and dry mass of seedlings. The conclusions were that seeds of Mimosa flocculosa Burkart. submitted overcome dormancy with water at 100 °C for five minutes and followed by dryingin oven at 32 °C for 24 h and packed in hermetic bags preserved, the physiological quality for 180 days.