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Registro Completo |
Biblioteca(s): |
Embrapa Amazônia Ocidental. |
Data corrente: |
04/12/2000 |
Data da última atualização: |
17/06/2015 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
LEHMANN, J.; TRUJILLO, L.; ZECH, W. |
Afiliação: |
Yniversity of Bayreuth. |
Título: |
Subsoil nitrogen dynamics in Amazonian forest successions. |
Ano de publicação: |
2000 |
Fonte/Imprenta: |
In: GERMAN-BRAZILIAN WORKSHOP ON NEOTROPICAL ECOSYSTEMS, 2000, Hamburg. Programa and abstracts... Hamburg: University, 2000. |
Páginas: |
p. 176. |
Idioma: |
Inglês |
Conteúdo: |
In this study we were mesuring mineral and total soil N to a depth of 8 m in secondary forest and under two primary forest species in three replicates, in Manaus-AM (Brasil). The results show low amounts of nitrate underneath the secondary forest to a depth of 2 m, whereas the nitrate contents under the two primary forest sites were high at 1 m - 2 m depth. Below 2 m depth, it was reversed and the mineral soil N was higher under the secondary forest than the primary forest. The N mineralization showed the same trend indicating that a large portion of the N is leached in its organic form. |
Palavras-Chave: |
Amazonas; Brasil; Manaus. |
Thesagro: |
Floresta Tropical Úmida; Latossolo Amarelo; Lixiviação; Nitrogênio; Solo. |
Thesaurus Nal: |
Ferralsols; leaching; nitrogen; tropical rain forests. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/125525/1/p.-176.pdf
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Marc: |
LEADER 01393nam a2200289 a 4500 001 1670036 005 2015-06-17 008 2000 bl uuuu u00u1 u #d 100 1 $aLEHMANN, J. 245 $aSubsoil nitrogen dynamics in Amazonian forest successions. 260 $aIn: GERMAN-BRAZILIAN WORKSHOP ON NEOTROPICAL ECOSYSTEMS, 2000, Hamburg. Programa and abstracts... Hamburg: University$c2000 300 $ap. 176. 520 $aIn this study we were mesuring mineral and total soil N to a depth of 8 m in secondary forest and under two primary forest species in three replicates, in Manaus-AM (Brasil). The results show low amounts of nitrate underneath the secondary forest to a depth of 2 m, whereas the nitrate contents under the two primary forest sites were high at 1 m - 2 m depth. Below 2 m depth, it was reversed and the mineral soil N was higher under the secondary forest than the primary forest. The N mineralization showed the same trend indicating that a large portion of the N is leached in its organic form. 650 $aFerralsols 650 $aleaching 650 $anitrogen 650 $atropical rain forests 650 $aFloresta Tropical Úmida 650 $aLatossolo Amarelo 650 $aLixiviação 650 $aNitrogênio 650 $aSolo 653 $aAmazonas 653 $aBrasil 653 $aManaus 700 1 $aTRUJILLO, L. 700 1 $aZECH, W.
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Registro original: |
Embrapa Amazônia Ocidental (CPAA) |
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Registro Completo
Biblioteca(s): |
Embrapa Clima Temperado; Embrapa Milho e Sorgo. |
Data corrente: |
11/07/2022 |
Data da última atualização: |
11/07/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
B - 2 |
Autoria: |
SILVA, A. F. da; PADRÃO, V. A.; CONCENÇO, G.; GALON, L.; ASPIAZÚ, I. |
Afiliação: |
ALEXANDRE FERREIRA DA SILVA, CNPMS; VITOR ABREU PADRÃO, Universidade Federal de São João Del-Rei; GERMANI CONCENCO, CPACT; LEANDRO GALON, Universidade Federal da Fronteira Sul; IGNACIO ASPIAZÚ, Universidade Estadual de Minas Gerais. |
Título: |
Control efficacy and phytosociological characterization of weeds as a function of post-emergence herbicides applied to maize. |
Ano de publicação: |
2022 |
Fonte/Imprenta: |
Revista Brasileira de Milho e Sorgo, v. 21, e1240, 2022. |
DOI: |
https://doi.org/10.18512/rbms2022v21e1240 |
Idioma: |
Inglês |
Conteúdo: |
ABSTRACT - Studies evaluating the effectiveness of herbicides on weed control, coupled with the sustainability of the weed management system, are of great importance. The present study aims to evaluate the efficacy of post-emergence herbicides applied to maize while inferring the sustainability of the treatments employing an ecological approach. The experiment was installed in a randomized block design with four replications. The treatments consisted of the application of atrazine at the dose of 1500 g ha-1; atrazine + mesotrione at 1500 + 72 g ha-1; atrazine + tembotrione at 1500 + 100.8 g ha-1; atrazine + nicosulfuron at 1500 + 22.5 g ha-1; atrazine + glyphosate at 1500 g ha-1 + 792.5 g ha-1, in addition to weeded and infested control treatments. The herbicides were applied at the 4 leaf stage of maize. The phytotoxicity and control efficacy was assessed 7, 14, 21, and 28 days after applying treatments (DAT). In addition, a phytosociological survey of all plots was carried out in the last assessment. Herbicides did not cause phytotoxicity symptoms to the crop. However, associations of atrazine with glyphosate and atrazine with tembotrione promoted the greater effectiveness of weed control. Despite being classified as one of the treatments with better effectiveness, the association between glyphosate and atrazine, caused a more significant reduction in the diversity of the plant community, and alternative weed management practices should be applied to maize cropping fields to avoid weed selection.
RESUMO - Estudos avaliando a eficácia de herbicidas no controle de plantas daninhas, aliados à sustentabilidade do sistema de manejo de plantas daninhas, são de grande importância. O presente estudo tem como objetivo avaliar a eficácia de herbicidas pós-emergência aplicados ao milho e inferir a sustentabilidade dos tratamentos utilizando uma abordagem ecológica. O experimento foi instalado em delineamento de blocos casualizados com quatro repetições. Os tratamentos consistiram na aplicação de atrazina na dose de 1500 g ha-1; atrazina + mesotriona a 1500 + 72 g ha-1; atrazina + tembotriona a 1500 + 100,8 g ha-1; atrazina + nicossulfurão a 1500 + 22,5 g ha-1; atrazina + glifosato a 1500 g ha-1 + 792,5 g ha-1, além dos tratamentos de controle capinado e infestado. Os herbicidas foram aplicados no estádio de 4 folhas do milho. A fitotoxicidade e a eficácia do controle foram avaliadas 7, 14, 21 e 28 dias após a aplicação dos tratamentos (DAT). Além disso, na última avaliação foi realizado um levantamento fitossociológico de todas as parcelas. Os herbicidas não causaram sintomas de fitotoxicidade à cultura. No entanto, associações de atrazina com glyphosate e atrazina com tembotrione promoveram maior eficácia no controle de plantas daninhas. Apesar de ser classificado como um dos tratamentos com melhor eficácia, a associação entre glyphosate e atrazina, causou uma redução mais significativa na diversidade da comunidade vegetal, e práticas alternativas de manejo de plantas daninhas devem ser aplicadas aos campos de cultivo de milho para evitar a seleção de plantas daninhas. MenosABSTRACT - Studies evaluating the effectiveness of herbicides on weed control, coupled with the sustainability of the weed management system, are of great importance. The present study aims to evaluate the efficacy of post-emergence herbicides applied to maize while inferring the sustainability of the treatments employing an ecological approach. The experiment was installed in a randomized block design with four replications. The treatments consisted of the application of atrazine at the dose of 1500 g ha-1; atrazine + mesotrione at 1500 + 72 g ha-1; atrazine + tembotrione at 1500 + 100.8 g ha-1; atrazine + nicosulfuron at 1500 + 22.5 g ha-1; atrazine + glyphosate at 1500 g ha-1 + 792.5 g ha-1, in addition to weeded and infested control treatments. The herbicides were applied at the 4 leaf stage of maize. The phytotoxicity and control efficacy was assessed 7, 14, 21, and 28 days after applying treatments (DAT). In addition, a phytosociological survey of all plots was carried out in the last assessment. Herbicides did not cause phytotoxicity symptoms to the crop. However, associations of atrazine with glyphosate and atrazine with tembotrione promoted the greater effectiveness of weed control. Despite being classified as one of the treatments with better effectiveness, the association between glyphosate and atrazine, caused a more significant reduction in the diversity of the plant community, and alternative weed management practices should be applied to maize cropping fields ... Mostrar Tudo |
Palavras-Chave: |
Dissimilaridade; Dissimilarity; Diversidade; Diversity; Planta daninha. |
Thesagro: |
Controle Químico; Erva Daninha; Herbicida; Zea Mays. |
Thesaurus NAL: |
Chemical control. |
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1144576/1/Control-efficacy-and-phytosociological-characterization-of-weeds.pdf
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Marc: |
LEADER 04058naa a2200301 a 4500 001 2144576 005 2022-07-11 008 2022 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.18512/rbms2022v21e1240$2DOI 100 1 $aSILVA, A. F. da 245 $aControl efficacy and phytosociological characterization of weeds as a function of post-emergence herbicides applied to maize.$h[electronic resource] 260 $c2022 520 $aABSTRACT - Studies evaluating the effectiveness of herbicides on weed control, coupled with the sustainability of the weed management system, are of great importance. The present study aims to evaluate the efficacy of post-emergence herbicides applied to maize while inferring the sustainability of the treatments employing an ecological approach. The experiment was installed in a randomized block design with four replications. The treatments consisted of the application of atrazine at the dose of 1500 g ha-1; atrazine + mesotrione at 1500 + 72 g ha-1; atrazine + tembotrione at 1500 + 100.8 g ha-1; atrazine + nicosulfuron at 1500 + 22.5 g ha-1; atrazine + glyphosate at 1500 g ha-1 + 792.5 g ha-1, in addition to weeded and infested control treatments. The herbicides were applied at the 4 leaf stage of maize. The phytotoxicity and control efficacy was assessed 7, 14, 21, and 28 days after applying treatments (DAT). In addition, a phytosociological survey of all plots was carried out in the last assessment. Herbicides did not cause phytotoxicity symptoms to the crop. However, associations of atrazine with glyphosate and atrazine with tembotrione promoted the greater effectiveness of weed control. Despite being classified as one of the treatments with better effectiveness, the association between glyphosate and atrazine, caused a more significant reduction in the diversity of the plant community, and alternative weed management practices should be applied to maize cropping fields to avoid weed selection. RESUMO - Estudos avaliando a eficácia de herbicidas no controle de plantas daninhas, aliados à sustentabilidade do sistema de manejo de plantas daninhas, são de grande importância. O presente estudo tem como objetivo avaliar a eficácia de herbicidas pós-emergência aplicados ao milho e inferir a sustentabilidade dos tratamentos utilizando uma abordagem ecológica. O experimento foi instalado em delineamento de blocos casualizados com quatro repetições. Os tratamentos consistiram na aplicação de atrazina na dose de 1500 g ha-1; atrazina + mesotriona a 1500 + 72 g ha-1; atrazina + tembotriona a 1500 + 100,8 g ha-1; atrazina + nicossulfurão a 1500 + 22,5 g ha-1; atrazina + glifosato a 1500 g ha-1 + 792,5 g ha-1, além dos tratamentos de controle capinado e infestado. Os herbicidas foram aplicados no estádio de 4 folhas do milho. A fitotoxicidade e a eficácia do controle foram avaliadas 7, 14, 21 e 28 dias após a aplicação dos tratamentos (DAT). Além disso, na última avaliação foi realizado um levantamento fitossociológico de todas as parcelas. Os herbicidas não causaram sintomas de fitotoxicidade à cultura. No entanto, associações de atrazina com glyphosate e atrazina com tembotrione promoveram maior eficácia no controle de plantas daninhas. Apesar de ser classificado como um dos tratamentos com melhor eficácia, a associação entre glyphosate e atrazina, causou uma redução mais significativa na diversidade da comunidade vegetal, e práticas alternativas de manejo de plantas daninhas devem ser aplicadas aos campos de cultivo de milho para evitar a seleção de plantas daninhas. 650 $aChemical control 650 $aControle Químico 650 $aErva Daninha 650 $aHerbicida 650 $aZea Mays 653 $aDissimilaridade 653 $aDissimilarity 653 $aDiversidade 653 $aDiversity 653 $aPlanta daninha 700 1 $aPADRÃO, V. A. 700 1 $aCONCENÇO, G. 700 1 $aGALON, L. 700 1 $aASPIAZÚ, I. 773 $tRevista Brasileira de Milho e Sorgo$gv. 21, e1240, 2022.
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