Pablo Radamés Cabral de França

Armazenamento de sementes de Erythrina velutina willd

The objective of this experiment was to evaluate the effect of different packages and storage environments in maintainace of physiological quality of Erythrina velutina Willd seeds. The experiment was carried out in the Laboratory of Seed Analysis of Seeds in Department of Phytotecny in the Center of Agriculture Sciences at Federal University of Paraiba (CCA-UFPB), located in Areia, northeastern Brazil. The seeds of Erythrina velutina were collected under the matrix trees in the same city and taken to the laboratory, where it was carried out homogenization and packing in paper, cloth and glass packages and, posterior storage in non-controlled laboratory conditions (±25oC), refrigerator (6 ± 2oC) and cold chamber (4 ± 2oC), for a period of 225 days. Before and after the 45- day intervals, samples were removed from each package and storage environment for evaluation of the following characteristics: water content, emergency test (percentage and speed rate); length and dry mass of epicotyle, hipocotyle and root of normal seedlings. The experimental design used was completely randomized with four replicates of 25 seeds for each test. E. velutina seeds are orthodox and by packing them in paper, cloth or glass packages, they can be stored in environments of laboratory, refrigerator and cold chamber for 225 days without significant loss in seedling emergency.

UMEDECIMENTO DO SUBSTRATO E TEMPERATURA NA GERMINAÇÃO DE SEMENTES DE Parkia platycephala BENTH.

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 oC can be used for germination and vigor of Parkia platycephala Benth. The temperature of 20oC and all volumes of water tested for wetting the substrate reduced the germination and the vigor of these seeds.

TERMOTERAPIA ALTERNATIVA PARA SEMENTES ORGÂNICAS DE TOMATE CEREJA (Solanum lycopersicum var. cerasiforme)

Do ponto de vista agronômico, as plantas originarias das sementes orgânicas apresentam alta adaptabilidade as condições climáticas do ambiente que estão inseridas. Dessa forma, estas sementes representam uma alternativa viável para os agricultores familiares, no que se refere ao autoconsumo e comercialização, sendo preferidas nas unidades produtivas (SECCO, 2010). No entanto, o desenvolvimento das plantas pode ser influenciado pela qualidade das sementes (CARVALHO; NAKAGAWA, 2012). Nesse sentido, surge a necessidade do desenvolvimento e aplicação de técnicas que facilitem o manejo das sementes pelos agricultores em suas unidades produtivas.

Substrate moisture and temperature in the germination and vigor of Amburana cearensis (All.) A.C. Smith seeds

Amburana cearensis (Allemao) A.C. Smith is an important economic species of the Brazilian Caatinga and in popular medicine and germination test procedures for laboratory analyses need to be standardized. The objective of this study was to evaluate the effects of different water volumes in the substrate and also temperatures on A. cearensis germination. The seeds were sown in paper towels wetted with the water equivalent of 2.0; 2.5; 3.0 and 3.5 times the substrate weight. No more water was added and the seeds were maintained in chambers at constant temperatures of 30 oC and 35 oC. The following parameters were analyzed: the germination percentage, first count germination, index of germination speed, length and dry mass of seedlings. A completely randomized design was used with a 4 x 2 factorial (water volumes and temperatures). The 35 oC temperature impaired the germination and vigor of A. cearensis seeds. A temperature of 30 oC and a water volume of 3.5 times the weight of paper is the most suitable combination for doing germination tests and evaluating the vigor of A. cearensis seeds.