Substrate moisture and temperature in germination of Parkia platycephala Benth. seeds/Umedecimento do substrato e temperatura na germinacao de sementes de Parkia platycephala Benth

• Published in: Ciência florestal 2015-07, p.563
• Main Authors: Goncalves, Edilma Pereira, de Franca, Pablo Radames Cabral, Viana, Jeandson Silva, Alves, Edna Ursulino, Guedes, Roberta Sales, de Lima, Cosmo Rufino
• Format: Article
• Language: Spanish
• ISSN: 1980-5098

The Parkia platycephala Benth. (faveira) is a leguminous tree, known as a provider of commercial wood in the Amazon rain forest. This study aimed to evaluate the effects of different volumes of water for substrate moisture and temperatures on germination of Parkia platycephala. After this, they were sowing over towel paper, organized in rolls wetted with water contents equivalent to 2.0; 2.5; 3.0 and 3.5 times the weight of the substrate without new water addition, and they were maintained in chambers at constant temperatures of 20, 25, 30°C and alternate temperature 20-30°C. The following parameters were analyzed: the germination percentage, first count germination, index of germination speed, length and dry mass of seedlings (shoot and root). A completely randomized design was used with a 4 x 4 factorial (water volumes and temperatures). The moistening of the substrate with 2.0, 2.5, 3.0 and 3.5 times the weight of the paper at temperatures of 25, 30 and 20-30°C can be used for germination and vigor of Parkia platycephala Benth. The temperature of 20°C and all volumes of water tested for wetting the substrate reduced the germination and the vigor of these seeds. Keywords: forest seeds; imbibition; volume of water; faveira. A Parkia platycephala Benth. (faveira) e uma leguminosa arborea, conhecida como fornecedora de madeira comercial na Amazonia. O presente trabalho foi conduzido com o objetivo de avaliar diferentes volumes de agua para umedecimento do substrato e temperaturas na germinacao e vigor de sementes de Parkia platycephala. As sementes foram submetidas ao teste de germinacao em papel-toalha, organizado na forma de rolos e umedecido com volumes de agua equivalentes a 2,0; 2,5; 3,0 e 3,5 vezes o peso seco do substrato e colocadas nas temperaturas constantes de 20, 25, 30 e alternada de 20-30°C. Foram avaliados: a porcentagem de germinacao, a primeira contagem de germinacao e o indice de velocidade de germinacao, o comprimento e a massa seca da raiz e da parte aerea das plantulas normais. O delineamento experimental foi o inteiramente ao acaso, com os tratamentos distribuidos em esquema fatorial 4 x 4 (quatro volumes de agua e quatro temperaturas). O umedecimento do substrato com 2,0; 2,5; 3,0 e 3,5 vezes o peso do papel nas temperaturas de 25, 30 e 20-30°C pode ser utilizado para avaliacao da germinacao e vigor das sementes de Parkia platycephala Benth. A temperatura de 20°C em todos os volumes de agua testados para umedecimento do substrato redu