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Registro Completo |
Biblioteca(s): |
Embrapa Meio Ambiente. |
Data corrente: |
16/10/2017 |
Data da última atualização: |
16/10/2017 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
SPADOTTO, C. A.; HORNSBY, A. G.; GOMES, M. A. F. |
Afiliação: |
CLAUDIO APARECIDO SPADOTTO, SGTE; UNIVERSITY OF FLORIDA/USA; MARCO ANTONIO FERREIRA GOMES, CNPMA. |
Título: |
Sorption and leaching potential of acidic herbicides in brazilian soils. |
Ano de publicação: |
2004 |
Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DA CIÊNCIA DAS PLANTAS DANINHAS, 24., 2004, São Pedro. Anais... Londrina: SBCPD, 2004. 2p. Resumos Expandidos n. 175. 1 CD-ROM. |
Idioma: |
Inglês |
Conteúdo: |
Leaching potentials of three acidic herbicides were assessed for three different Brazilian soils, by means of the multi-layered AFi model. Values of AFi were also calculated for each herbicide using a modified model (AFi*), where sorption coefficient (Kd) values are pH-dependent. The pH-dependent Kd values estimated for all three herbicides were always higher than pH-independent Kd values calculated using average Koc data. The pHdependent Kd values for the three herbicides evidenced a large variation from layer to layer following changes in OC and pH for the different soil depths. When OC decreases, Kd tends to decrease; on the other hand, lowering pH tends to increase Kd. For all three soils, OC and pH exhibit an overall decrease with depth. Despite differences between the pH-independent Kd and the pH-dependent Kd values, the AFi values for 2,4-D, calculated by the original multilayered-soil model and by the modified model (AFi*), were similarly low for all three soils, mostly due to the short half-life of 2,4-D. The pH-dependent AFi values for flumetsulam were always much lower than values calculated by the original multi-layered model. Therefore, the pH-independent model appears to overestimate leaching potential of flumetsulam. The AFi values for sulfentrazone calculated by the original and the modified models were similarly high for all three soils, despite the differences in Kd values. The long half-life of sulfentrazone mostly contributed to the similar high values of AFi for the three different soils. Overall AFi values showed large differences for sulfentrazone when calculated by the original and by the modified model (AFi*), owing to its high AF value for each layer. Thus, the original AFi model would seem to markedly overestimate the leaching potential for sulfentrazone, as well as for flumetsulam for these soil conditions MenosLeaching potentials of three acidic herbicides were assessed for three different Brazilian soils, by means of the multi-layered AFi model. Values of AFi were also calculated for each herbicide using a modified model (AFi*), where sorption coefficient (Kd) values are pH-dependent. The pH-dependent Kd values estimated for all three herbicides were always higher than pH-independent Kd values calculated using average Koc data. The pHdependent Kd values for the three herbicides evidenced a large variation from layer to layer following changes in OC and pH for the different soil depths. When OC decreases, Kd tends to decrease; on the other hand, lowering pH tends to increase Kd. For all three soils, OC and pH exhibit an overall decrease with depth. Despite differences between the pH-independent Kd and the pH-dependent Kd values, the AFi values for 2,4-D, calculated by the original multilayered-soil model and by the modified model (AFi*), were similarly low for all three soils, mostly due to the short half-life of 2,4-D. The pH-dependent AFi values for flumetsulam were always much lower than values calculated by the original multi-layered model. Therefore, the pH-independent model appears to overestimate leaching potential of flumetsulam. The AFi values for sulfentrazone calculated by the original and the modified models were similarly high for all three soils, despite the differences in Kd values. The long half-life of sulfentrazone mostly contributed to the similar high values of... Mostrar Tudo |
Palavras-Chave: |
Modelo multi-camadas. |
Thesagro: |
Ph. |
Thesaurus Nal: |
flumetsulam; sulfentrazone. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/165137/1/2004SP-67-Spadotto-Soption-15701.pdf
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Marc: |
LEADER 02502nam a2200181 a 4500 001 2077454 005 2017-10-16 008 2004 bl uuuu u00u1 u #d 100 1 $aSPADOTTO, C. A. 245 $aSorption and leaching potential of acidic herbicides in brazilian soils.$h[electronic resource] 260 $aIn: CONGRESSO BRASILEIRO DA CIÊNCIA DAS PLANTAS DANINHAS, 24., 2004, São Pedro. Anais... Londrina: SBCPD, 2004. 2p. Resumos Expandidos n. 175. 1 CD-ROM.$c2004 520 $aLeaching potentials of three acidic herbicides were assessed for three different Brazilian soils, by means of the multi-layered AFi model. Values of AFi were also calculated for each herbicide using a modified model (AFi*), where sorption coefficient (Kd) values are pH-dependent. The pH-dependent Kd values estimated for all three herbicides were always higher than pH-independent Kd values calculated using average Koc data. The pHdependent Kd values for the three herbicides evidenced a large variation from layer to layer following changes in OC and pH for the different soil depths. When OC decreases, Kd tends to decrease; on the other hand, lowering pH tends to increase Kd. For all three soils, OC and pH exhibit an overall decrease with depth. Despite differences between the pH-independent Kd and the pH-dependent Kd values, the AFi values for 2,4-D, calculated by the original multilayered-soil model and by the modified model (AFi*), were similarly low for all three soils, mostly due to the short half-life of 2,4-D. The pH-dependent AFi values for flumetsulam were always much lower than values calculated by the original multi-layered model. Therefore, the pH-independent model appears to overestimate leaching potential of flumetsulam. The AFi values for sulfentrazone calculated by the original and the modified models were similarly high for all three soils, despite the differences in Kd values. The long half-life of sulfentrazone mostly contributed to the similar high values of AFi for the three different soils. Overall AFi values showed large differences for sulfentrazone when calculated by the original and by the modified model (AFi*), owing to its high AF value for each layer. Thus, the original AFi model would seem to markedly overestimate the leaching potential for sulfentrazone, as well as for flumetsulam for these soil conditions 650 $aflumetsulam 650 $asulfentrazone 650 $aPh 653 $aModelo multi-camadas 700 1 $aHORNSBY, A. G. 700 1 $aGOMES, M. A. F.
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Registro original: |
Embrapa Meio Ambiente (CNPMA) |
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Registro Completo
Biblioteca(s): |
Embrapa Gado de Leite. |
Data corrente: |
23/03/2011 |
Data da última atualização: |
25/03/2024 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
PINTO, I. S. B.; FAZA, A. P.; MONTEIRO, C. M. O.; ANTUNES, G. R.; PAIVA, D. S.; MEIRA, L. H. R.; PRATA, M. C. de A.; FURLONG, J.; GUIMARAES, M. F. M. |
Afiliação: |
FAPEMIG; FAPEMIG; UFRRJ; UFJF; UFJF; UNIPAC; MARCIA CRISTINA DE AZEVEDO PRATA, CNPGL; JOHN FURLONG, CNPGL; MARTA FONSECA MARTINS GUIMARAES, CNPGL. |
Título: |
Caracterização molecular de populações de Rhipicephalus (Boophilus) microplus (Acari: ixodidae) resistente a piretróides. |
Ano de publicação: |
2010 |
Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE PARASITOLOGIA VETERINÁRIA, 16., 2010, Campo Grande, MS. [Anais...]. Campo Grande, MS: Colégio Brasileiro de Parasitologia Veterinária, 2010. |
Idioma: |
Português |
Palavras-Chave: |
Carrapato de bovinos; Genotipagem. |
Thesagro: |
DNA. |
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/882368/1/Caracterizacao-molecular-de-populacoes-de-Rhipicephalus.pdf
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Marc: |
LEADER 00846nam a2200229 a 4500 001 1882368 005 2024-03-25 008 2010 bl uuuu u00u1 u #d 100 1 $aPINTO, I. S. B. 245 $aCaracterização molecular de populações de Rhipicephalus (Boophilus) microplus (Acari$bixodidae) resistente a piretróides.$h[electronic resource] 260 $aIn: CONGRESSO BRASILEIRO DE PARASITOLOGIA VETERINÁRIA, 16., 2010, Campo Grande, MS. [Anais...]. Campo Grande, MS: Colégio Brasileiro de Parasitologia Veterinária$c2010 650 $aDNA 653 $aCarrapato de bovinos 653 $aGenotipagem 700 1 $aFAZA, A. P. 700 1 $aMONTEIRO, C. M. O. 700 1 $aANTUNES, G. R. 700 1 $aPAIVA, D. S. 700 1 $aMEIRA, L. H. R. 700 1 $aPRATA, M. C. de A. 700 1 $aFURLONG, J. 700 1 $aGUIMARAES, M. F. M.
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