Effects of heating and sulfuric acid on seed dormancy of Brachiaria dictyoneura cv. Llanero. / Comportamento da dormência de sementes de Brachiaria dictyoneura cv. Llanero submetidas às ações do calor e do ácido sulfúrico.
AUTOR(ES)
Clodoaldo Rocha de Almeida
DATA DE PUBLICAÇÃO
2002
RESUMO
Seed dormancy is emphasized in the literature as a problem for the establishment of tropical pasture grasses. Immersion of seeds in sulfuric acid (H2SO4) has been widely used and is effective in breaking dormancy of Brachiaria seeds, although this treatment raises inconveniences relating to the operator safety during application. Moreover, refusal of residues from this chemical treatment may become harmful to the environment. This essay aims to evaluate alternative seed treatments for overcoming dormancy, comparing physiological effects from heating treatments (55, 65, 75 and 85 o C, for 5, 10 and 15 hour) and chemical scarification (immersion in H2SO4 for 15 minutes) in seeds of Brachiaria dyctioneura cv. Llanero (Brachiaria humidicola cv. Llanero, according to Renvoize et al., 1996). Therefore, seeds were evaluated for their quality attributes (water content, germination, tetrazolium, first count of germination, seedling emergence, shoot length of seedlings, and emergence speed index), twice during the experiment (in the beginning and at the end of a six-month storage). Heating and sulfuric acid are alternative treatments for overcoming seed dormancy, consequently favoring physiological performance. However, particularly for the heating treatment, seed deterioration may be accelerated during storage.
ASSUNTO(S)
armazenamento agrícola brachiaria storage dormência de plantas alta temperatura sulfuric acid capim braquiária heating treatment sementes ácido sulfúrico dormancy seeds
Documentos Relacionados
- Comportamento da dormência em sementes de Brachiaria dictyoneura cv. Llanero submetidas às ações do calor e do ácido sulfúrico
- Profundidade de semeadura e superação de dormência no crescimento inicial de sementes de Brachiaria dictyoneura (Fig. & De Not.) Stapf (1919) cv. Llanero
- Neutralização de sementes de capim Brachiaria escarificadas com ácido sulfúrico
- Ações fisiológicas do calor e do ácido sulfúrico em sementes de Brachiaria brizantha cultivar marandu
- Efeitos da escarificação com ácido sulfúrico na liberação da dormência de sementes de Brachiaria brizantha, B. humidicola and Panicum maximum