Emergência de plântulas de tucumã (Astrocaryum aculeatum) em função da posição de semeadura

Abstract

The aim of this study was to evaluate the influence of the position of the seed in the substrate on the emergency of tucumã (Astrocaryum aculeatum) seedling. After extraction and soaking, the seeds were sown obeying the following positions: a) 0º - germ pore turned upward, forming a 0º angle in relation to a perpendicular imaginary axis at the level of the substrate; b) 45º - germ pore sloping, forming an angle of 45º in relation to the imaginary axis; c) 90º - germ pore turned to the side, forming an angle of 90º in relation to the imaginary axis. The seeds at 90º presented superiority in emergency, with 45% of seedlings in the "emission of the second scale leaf" stage, and only 35% of dormant seeds after 270 days of observation. The emergency is influenced by the sowing position, and the increase of the depth of the germ pore in the substrate provided an increase of the emergence and decrease of the percentage of dormant seeds.