Germinação de sementes de urucu em diferentes temperaturas e substratos

Abstract

This work was carried out with the objective to verify the effect of temperature and substrate on germinative capacity of annatto seeds. This study was developed in the Laboratories of Seed Analysis of Agrarian Science Center that belongs to the Universidade Federal do Espirito Santo (CCA-UFES), located in Alegre ES, Brazil. The experimental design was 2x6x4 factorial involving: (i) two treatments in the seeds, (ii) six substrates, and (iii) four temperatures. Four replications were realized using 50 seeds at each experimental unit. Treatments refer to intact and scarified seeds. Substrates utilized were sand, vermiculite, coconut fiber, wood fiber, Plantmax and paper roll. Temperatures employed were 20, 25, 30 and 20-30ºC. Average contrasts were verified using Tukey test at 5% of significance. It can be concluded: (i) that better percentages of germination occurred by using sand substrate, vermiculite and paper roll; and (ii) temperatures of 25, 30 and 20-30ºC can be utilized in germination tests of annatto seeds.

Advances in the Propagation of Rambutan Tree

“…The influence of temperature on the germination of the fruit seeds has been widely studied, and it is possible to know a little more about the characteristics of each species and the ability to grow or produce seedlings in certain places and seasons of the year. Experiments show and evidence the differentiated response according to the species, and Lamarca et al (2011) observed a wide adaptation to the emergence of seeds of some species of Eugenia in the most diverse temperatures tested, with germination and development of normal seedlings in the temperature range of 20 to 30ºC, being still indifferent to the temperature alternation (20/30 and 20/35ºC) and also reported by Lima et al (2007), who found higher rates for 'urucuzeiro' seeds at temperatures of 25, 30ºC and alternated between 20-30ºC. Silva et al (2006) observed better results for 'bacabinha' seeds when submitted to a temperature of 30ºC the same was verified by Oliveira et al (2005) for false annona muricata and by for 'jabuticabeira'.…”

Germinação de sementes de urucum em função de métodos de superação de dormência e temperaturas

“…Estes resultados estão de acordo com Almeida et al (1992), os quais relataram que, para a germinação da maioria das variedades de urucum, as temperaturas de 25ºC e 30ºC são mais eficientes. Lima et al (2007) também verificaram, em sementes de urucum, maiores médias de protusão de raiz primária de sementes escarificadas a 25ºC e 30ºC, porém, não diferindo, estatisticamente, da temperatura alternada de 20-30ºC.…”

“…A temperatura de 20 o C não se mostrou adequada ao desenvolvimento das plântulas de urucum. Estes dados estão de acordo com Lima et al (2007), que demonstraram que o desenvolvimento de urucum a 20ºC é prejudicado, apresentando maior quantidade de plântulas anormais.…”

Qualidade fisiológica de sementes de pitangueira submetidas a diferentes procedimentos de secagem e substratos - Parte 1

“…Embora não sejam prescritos em Brasil (1992), a vermiculita e o pó-de-coco vêm sendo usados com bons resultados para sementes de algumas espécies florestais e frutíferas (Figliola et al, 1993;Lopes et al, 2005;Azeredo et al, 2006;Pacheco et al, 2006;Lima et al, 2007;Pacheco et al, 2007).…”