Seed germination and seedling growth of the Mexican sunflower Tithonia diversifolia (Compositae) in Nigeria, Africa.
Rev Biol Trop
; 54(2): 395-402, 2006 Jun.
Article
em En
| MEDLINE
| ID: mdl-18494310
We studied seed germination and seedling growth of the Mexican sunflower Tithonia diversifolia in Nigeria. This involved the usage of some dormancy-releasing methods and the effect of some concentrations of three herbicide formulations on the young seedlings. Initial germination tests on fresh and stored seeds revealed a low percentage germination of less than 30%. The seeds of the weed exhibit dormancy. Subjecting the seeds to wet heat at 80 and 100 degrees C and light treatment terminated dormancy both in the fresh and stored seeds. Light greatly enhanced the germination percentage of seeds by about 70%. There was gradual increase in germination percentage with increase in storage period in dormancy-released seeds. The mean LAR (Leaf Area Ratio), NAR (Net Assimilation Rate) and RGR (Relative Growth Rate) are comparatively high in young seedlings. Concentrations of 0.5-2.0% of Gramoxone, Primextra and Galex are toxic to 1 month old seedlings. For eradication, the seedlings should be attacked at one month stage.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Atrazina
/
Sementes
/
Germinação
/
Plântula
/
Helianthus
/
Herbicidas
/
Acetamidas
Limite:
Animals
País/Região como assunto:
Africa
/
Mexico
Idioma:
En
Revista:
Rev Biol Trop
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Nigéria
País de publicação:
Costa Rica