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 | Acesso ao texto completo restrito à biblioteca da Epagri-Sede. Para informações adicionais entre em contato com biblio@epagri.sc.gov.br. |
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Registro Completo |
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
08/11/2007 |
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Data da última atualização: |
12/11/2007 |
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Autoria: |
YARED, J. A. G.; COUTO, L.; LEITE, H. G. |
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Título: |
Composicao floristica de florestas secundaria e primaria, sob efeito de diferentes sistemas silviculturais, na Amazonia Oriental. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Revista Arvore, Vicos, MG, v.22, n.4, p. 463-474, 1998.
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Idioma: |
Português |
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Conteúdo: |
Sistemas silviculturais foram aplicados experimentalmente em florestas secundaria e primaria, na Amazonia Oriental, visando aumentar a producao de madeira de especies de interesse economico. Neste trabalho, sao analizadas as possiveis mudancas na composicao floristica dos dois tipos de floresta (secundaria e primaria), apos o uso de diferentes sistemas. A avaliacao dos povoamentos foi realizada por meio de inventarios florestais, usando o processo de amostragem aleatoria simples e identificando as especies presentes. O indice de Sorensen foi utilizado para comparar a composicao dos povoamentos manejados com a respectiva floresta de controle. Verificou-se que todos os povoamentos manejados apresentaram menor numero de familias, generos e especies. Cerca de 70% das especies presentes na floresta secundaria foram encontradas tambemnos povoamentos manejados, mas o mesmo nao ocorreu em florestas primaria, onde menos de 50% das especies estavam presentes nos povoamentos manejados. Em termos relativos, a participacao de especies comerciais foi maior nos povoamentos manejados, variando de acordo com o tipo de floresta e com o sitema adotado. |
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Palavras-Chave: |
Amazonia Oriental; Composicao florirtica; Floresta primaria; Sistema silvicultural. |
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Categoria do assunto: |
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Marc: |
LEADER 01761naa a2200193 a 4500
001 1062610
005 2007-11-12
008 1998 bl uuuu u00u1 u #d
100 1 $aYARED, J. A. G.
245 $aComposicao floristica de florestas secundaria e primaria, sob efeito de diferentes sistemas silviculturais, na Amazonia Oriental.
260 $c1998
520 $aSistemas silviculturais foram aplicados experimentalmente em florestas secundaria e primaria, na Amazonia Oriental, visando aumentar a producao de madeira de especies de interesse economico. Neste trabalho, sao analizadas as possiveis mudancas na composicao floristica dos dois tipos de floresta (secundaria e primaria), apos o uso de diferentes sistemas. A avaliacao dos povoamentos foi realizada por meio de inventarios florestais, usando o processo de amostragem aleatoria simples e identificando as especies presentes. O indice de Sorensen foi utilizado para comparar a composicao dos povoamentos manejados com a respectiva floresta de controle. Verificou-se que todos os povoamentos manejados apresentaram menor numero de familias, generos e especies. Cerca de 70% das especies presentes na floresta secundaria foram encontradas tambemnos povoamentos manejados, mas o mesmo nao ocorreu em florestas primaria, onde menos de 50% das especies estavam presentes nos povoamentos manejados. Em termos relativos, a participacao de especies comerciais foi maior nos povoamentos manejados, variando de acordo com o tipo de floresta e com o sitema adotado.
653 $aAmazonia Oriental
653 $aComposicao florirtica
653 $aFloresta primaria
653 $aSistema silvicultural
700 1 $aCOUTO, L.
700 1 $aLEITE, H. G.
773 $tRevista Arvore, Vicos, MG$gv.22, n.4, p. 463-474, 1998.
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Epagri-Sede (Epagri-Sede) |
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
07/12/2020 |
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Data da última atualização: |
07/12/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Nacional - B |
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Autoria: |
OLIVEIRA NETO, A. M.; GUERRA, N.; NOLDIN, J. A. |
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Título: |
Off-season management with herbicides as an alternative to reduce weed infestation in paddy rice production systems. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Planta Daninha, Londrina, PR, v. 38, p. e020228645, 2020. |
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Idioma: |
Inglês |
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Conteúdo: |
Weed management is a challenge in paddy rice production, mainly due to the dispersal of a population resistant to herbicides.
Objective: To assess the efficacy of chemical weed control in the offseason to reduce weedy rice and other species in water-seeded or drilled
rice.
Methods: Two experiments were carried out in a flat field to water-seeded or drilled rice, in randomized block design. The water-seeded system
treatments were organized in a split-plot design. In the plot were evaluated two water management in the off-season (with or without continuous
flooding), and in the subplot nine herbicides-treatments were evaluated (Check, clomazone at 0.72 and 1.08 kg a.i. ha-1, oxadiazon at 1.00 and
1.50 kg a.i. ha-1, oxyfluorfen at 0.312 and 0.48 kg a.i. ha-1, S-metolachlor at 1.44 kg a.i. ha-1, and flumioxazin a 0.075 kg a.i. ha-1). In the drilled rice experiment, the treatments were organized in a two-factor factorial. The factor A was nine herbicides treatments (the same herbicide and rates
applied in water-seeded experiment) and the factor B was two application time (73 and 43 days before of rice-sowing).
Results: Off-season management was efficient to reduce weedy rice infestation only on the paddy rice system using the pre-germinated seeds.
In this assay, flumioxazin was an efficient alternative to giant arrowhead control, however the selectivity of this herbicide treatment needs to be
studied. In dry-seeded system, herbicide sprayed in off-season reduced barnyardgrass infestation until the paddy rice sowing.
Conclusions: The off-season management was efficient to reduce weedy rice and giant arrowhead infestation in water-seeded system, and
barnyardgrass infestation in drill-seeded system. MenosWeed management is a challenge in paddy rice production, mainly due to the dispersal of a population resistant to herbicides.
Objective: To assess the efficacy of chemical weed control in the offseason to reduce weedy rice and other species in water-seeded or drilled
rice.
Methods: Two experiments were carried out in a flat field to water-seeded or drilled rice, in randomized block design. The water-seeded system
treatments were organized in a split-plot design. In the plot were evaluated two water management in the off-season (with or without continuous
flooding), and in the subplot nine herbicides-treatments were evaluated (Check, clomazone at 0.72 and 1.08 kg a.i. ha-1, oxadiazon at 1.00 and
1.50 kg a.i. ha-1, oxyfluorfen at 0.312 and 0.48 kg a.i. ha-1, S-metolachlor at 1.44 kg a.i. ha-1, and flumioxazin a 0.075 kg a.i. ha-1). In the drilled rice experiment, the treatments were organized in a two-factor factorial. The factor A was nine herbicides treatments (the same herbicide and rates
applied in water-seeded experiment) and the factor B was two application time (73 and 43 days before of rice-sowing).
Results: Off-season management was efficient to reduce weedy rice infestation only on the paddy rice system using the pre-germinated seeds.
In this assay, flumioxazin was an efficient alternative to giant arrowhead control, however the selectivity of this herbicide treatment needs to be
studied. In dry-seeded system, herbicide sprayed in off-season reduced barnyardgrass... Mostrar Tudo |
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Palavras-Chave: |
drill-seeded; Oryza sativa; pre-germinated; residual herbicides; water-seeded. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02363naa a2200205 a 4500
001 1130416
005 2020-12-07
008 2020 bl uuuu u00u1 u #d
100 1 $aOLIVEIRA NETO, A. M.
245 $aOff-season management with herbicides as an alternative to reduce weed infestation in paddy rice production systems.$h[electronic resource]
260 $c2020
520 $aWeed management is a challenge in paddy rice production, mainly due to the dispersal of a population resistant to herbicides. Objective: To assess the efficacy of chemical weed control in the offseason to reduce weedy rice and other species in water-seeded or drilled rice. Methods: Two experiments were carried out in a flat field to water-seeded or drilled rice, in randomized block design. The water-seeded system treatments were organized in a split-plot design. In the plot were evaluated two water management in the off-season (with or without continuous flooding), and in the subplot nine herbicides-treatments were evaluated (Check, clomazone at 0.72 and 1.08 kg a.i. ha-1, oxadiazon at 1.00 and 1.50 kg a.i. ha-1, oxyfluorfen at 0.312 and 0.48 kg a.i. ha-1, S-metolachlor at 1.44 kg a.i. ha-1, and flumioxazin a 0.075 kg a.i. ha-1). In the drilled rice experiment, the treatments were organized in a two-factor factorial. The factor A was nine herbicides treatments (the same herbicide and rates applied in water-seeded experiment) and the factor B was two application time (73 and 43 days before of rice-sowing). Results: Off-season management was efficient to reduce weedy rice infestation only on the paddy rice system using the pre-germinated seeds. In this assay, flumioxazin was an efficient alternative to giant arrowhead control, however the selectivity of this herbicide treatment needs to be studied. In dry-seeded system, herbicide sprayed in off-season reduced barnyardgrass infestation until the paddy rice sowing. Conclusions: The off-season management was efficient to reduce weedy rice and giant arrowhead infestation in water-seeded system, and barnyardgrass infestation in drill-seeded system.
653 $adrill-seeded
653 $aOryza sativa
653 $apre-germinated
653 $aresidual herbicides
653 $awater-seeded
700 1 $aGUERRA, N.
700 1 $aNOLDIN, J. A.
773 $tPlanta Daninha, Londrina, PR$gv. 38, p. e020228645, 2020.
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