Overcoming Seed Dormancy of Enterolobium contortisiliquum (Vell.) Morong
Manuel Tomaz Ataíde Júnior *
Federal Institute of Tocantins (IFTO), Gurupi, TO, Brazil.
Daniella Inácio Barros
Federal Institute of Tocantins (IFTO), Gurupi, TO, Brazil.
Helber Veras Nunes
Federal Institute of Tocantins (IFTO), Gurupi, TO, Brazil.
Higor Ângelo de Abreu
Federal University of Tocantins (UFT), Gurupi, TO, Brazil.
Liomar Borges de Oliveira
Federal University of Tocantins (UFT), Gurupi, TO, Brazil.
Paulo Victor Gomes Sales
Federal Institute of Tocantins (IFTO), Gurupi, TO, Brazil.
Mariana Senna Quirino
Federal University of Tocantins (UFT), Gurupi, TO, Brazil.
Jossimara Ferreira Damascena
Federal University of Tocantins (UFT), Gurupi, TO, Brazil.
Lorrayne Martins da Silva
Federal Institute of Tocantins (IFTO), Gurupi, TO, Brazil.
Lara Alves Valério da Silva
Federal Institute of Tocantins (IFTO), Gurupi, TO, Brazil.
Geovana Bispo de Araújo
Federal Institute of Tocantins (IFTO), Gurupi, TO, Brazil.
André Ferreira dos Santos
Federal University of Tocantins (UFT), Gurupi, TO, Brazil.
Evandro Alves Ribeiro
Federal University of Tocantins (UFT), Gurupi, TO, Brazil.
*Author to whom correspondence should be addressed.
Abstract
The use of new methods may facilitate the production of seedlings for reforestation since the seed market is scarce and seedlings take time to be produced. The Earpod tree is a native species that can be used for the floristic recomposition of the biome and with the possibility of using wood for commercial purposes. In this sense, the present work aimed to evaluate different methods of overcoming dormancy of the Enterolobium contortisiliquum (Vell.) Morong. Seven treatments were performed with 5 replications: T0: control, T1: mechanical scarification with a rasp, T2: mechanical scarification with welding electric appliance, T3: mechanical scarification with cutting pliers, T4 y T5: chemical scarification with sodium hydroxide 30% for 25 minutes and 30 minutes, respectively, and T6: immersion in 100°C water for 7 minutes. The following variables were evaluated: percentage of emergence, emergence speed index (ESI), the height of seedlings, number of leaves per seedling, stem diameter, and length of a root system. The mechanical scarification method with cutting pliers was the most efficient, with an emergence percentage of 96% and plant emergence speed indexes of 9.79. The treatments, chemical scarification with sodium hydroxide 30% for 30 and 25 minutes, and control showed low efficiency in overcoming dormancy, with an emergence percentage of 2, 6, and 4% and emergence rates of 0.14, 0.37 and 0.24.
Keywords: Germination, emergence, growth, seedlings