Superação de dormência e desenvolvimento incial de plântulas de Enterolobium schomburgkii (Benth.) Benth.

Abstract

The species Enterolobium schomburgkii ( Benth.) Benth is natural Amazon the timber potential, 26 fitness association with nitrogen fixing bacteria and produces abundant seeds, however, have 27 dormancy. We evaluated the effect of sulfuric acid in different periods of exposure (0, 2, 5, 10, 15 28 and 20 minutes) seed for overcoming dormancy and early development of Enterolobium 29 schomburgkii seedlings. We used a total of 540 seeds, 90 seeds per treatment. The determination of 30 germination percentage, mean germination time and germination speed index was performed in the 31 nursery, using a completely randomized design, composed of six treatments with five repetitions in 32 linear plots six polyethylene bags containing 3 seeds. At sixty- five days after sowing it evaluated 33 shoot height, root length, “colon” thickness and dry mass seedlings. The data were submitted to 34 analysis of variance, comparing average (5% Tukey) and polynomial regression pointed to the early 35 development of seedlings variables the quadratic model. The Immersion in sulfuric acid for 12 to 15 36 minutes provide greater results germination and seedling vigor and by increasing this period there 37 was a reduction in the initial development of seedlings.