Data/hora: 04/06/2024 14:03:06

Provedor de dados: | 95
País: | Brazil
Título: | Lolium Multiflorum seeds in the soil: II. Longevity under natural conditions
Autores: | Maia,Fernanda Costa; Maia,Manoel De Souza; Bekker,Renée M.; Berton,Rogério Previatti; Caetano,Leandro Sebastião.
Data: | 2009-01-01
Ano: | 2009
Palavras-chave: | Annual ryegrass; Persistence; Viability; Dormancy; Buried seeds.
Resumo: | The interest was the seed longevity dynamics of annual ryegrass in natural conditions as an important tool to explain its dynamics in no tillage systems used in the South of Brazil. The species is commonly managed for natural re-sowing and, in this way, allows cattle grazing with reduced costs during the winter time. In February of 2003, twenty bags of nylon screen containing sterilised soil with 100 seeds in each were randomly buried in the field, 5 cm deep. Around every three or four months, four sacks were exhumed. Seeds were counted and tested using germination and tetrazolium tests.The seeds showed high primary dormancy, which was overcome very fast. After 108, 226, 326, 565 and 732 days of burial there were no significant differences as the secondary dormancy of the seeds that did not germinate in autumn was not high. The last exhumation period was significantly different from the others due to the strong decay on seed viability. As few seeds remained viable after 732 days, the soil seed bank was classified as transient, being evident that in annual pastures the transitory seed banks have a main role in the regeneration of the species.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222009000200014
Editor: | Associação Brasileira de Tecnologia de Sementes
Relação: | 10.1590/S0101-31222009000200014
Formato: | text/html
Fonte: | Revista Brasileira de Sementes  v.31 n.2 2009
Fonte: | info:eu-repo/semantics/openAccess