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Registro Completo |
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Biblioteca(s): |
Embrapa Meio-Norte. |
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Data corrente: |
26/02/2010 |
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Data da última atualização: |
02/03/2010 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MICHEREFF, S. J.; NORONHA, M. A.; LIMA, G. S. A.; ALBERT, I. C. L.; MELO, E. A.; GUSMÃO, L. O. |
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Afiliação: |
Sami J. Michereff, UFPE; Marissônia A. Noronha, Embrapa Meio-Norte; Gaus S. A. Lima, UFAL; Ígor C. L. Albert, UFRPE; Edilaine A. Melo, UFAL; Luciana O. Gusmão, UFAL. |
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Título: |
Diagrammatic scale to assess downy mikdew severity in melon. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Horticultura Brasileira, v. 27, n. 1, p. 76-79, jan./mar. 2009. |
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Idioma: |
Inglês |
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Conteúdo: |
The downy mildew, caused by Pseudoperonospora cubensis, is an important melon disease in Northeast Brazil. Considering the lack of standard methods for its assessment, a diagrammatic scale was developed with 2, 4, 8, 16, 32, 64, 82, and 96% of affected leaf area. The scale was then checked for its accuracy, precision, and reproducibility in estimating downy mildew severity. The diagrammatic scale was validated by eight disease raters; using 50 leaves with different severity levels, previously measured using the software Assess®. Two evaluations were performed on the same set of leaves, but in a different sequence order, by the same raters, within a 15-day interval. The accuracy and precision of each rater was determined by simple linear regression between the actual and the estimated severity. The scale provided good levels of accuracy (means of 87.5%) and excellent levels of precision (means of 94%), with absolute errors concentrated around 10%. Raters showed great repeatability (means of 94%) and reproducibility (?90% in 90.3% of cases) of estimates. Therefore, we could conclude that the diagrammatic scale presented here was suitable for evaluating downy mildew severity in melon. |
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Palavras-Chave: |
Doença foliar; Fitopatometria. |
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Thesagro: |
Cucumis Melo; Epidemiologia. |
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Thesaurus Nal: |
Pseudoperonospora cubensis. |
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Categoria do assunto: |
-- |
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URL: |
https://www.scielo.br/pdf/hb/v27n1/15.pdf
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Marc: |
LEADER 01869naa a2200241 a 4500
001 1659098
005 2010-03-02
008 2009 bl uuuu u00u1 u #d
100 1 $aMICHEREFF, S. J.
245 $aDiagrammatic scale to assess downy mikdew severity in melon.
260 $c2009
520 $aThe downy mildew, caused by Pseudoperonospora cubensis, is an important melon disease in Northeast Brazil. Considering the lack of standard methods for its assessment, a diagrammatic scale was developed with 2, 4, 8, 16, 32, 64, 82, and 96% of affected leaf area. The scale was then checked for its accuracy, precision, and reproducibility in estimating downy mildew severity. The diagrammatic scale was validated by eight disease raters; using 50 leaves with different severity levels, previously measured using the software Assess®. Two evaluations were performed on the same set of leaves, but in a different sequence order, by the same raters, within a 15-day interval. The accuracy and precision of each rater was determined by simple linear regression between the actual and the estimated severity. The scale provided good levels of accuracy (means of 87.5%) and excellent levels of precision (means of 94%), with absolute errors concentrated around 10%. Raters showed great repeatability (means of 94%) and reproducibility (?90% in 90.3% of cases) of estimates. Therefore, we could conclude that the diagrammatic scale presented here was suitable for evaluating downy mildew severity in melon.
650 $aPseudoperonospora cubensis
650 $aCucumis Melo
650 $aEpidemiologia
653 $aDoença foliar
653 $aFitopatometria
700 1 $aNORONHA, M. A.
700 1 $aLIMA, G. S. A.
700 1 $aALBERT, I. C. L.
700 1 $aMELO, E. A.
700 1 $aGUSMÃO, L. O.
773 $tHorticultura Brasileira$gv. 27, n. 1, p. 76-79, jan./mar. 2009.
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Registro original: |
Embrapa Meio-Norte (CPAMN) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Territorial. Para informações adicionais entre em contato com cnpm.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Territorial. |
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Data corrente: |
30/09/2011 |
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Data da última atualização: |
03/05/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
PEREIRA, B. F. F.; HE, Z. L.; HERPIN, U.; NOGUEIRA, S. F.; MONTES, C. R.; MELFI, A. J. |
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Afiliação: |
B. F. F. PEREIRA, Esalq/USP; Z. L. HE, University of Florida; U. HERPIN, Esalq/USP; SANDRA FURLAN NOGUEIRA, CNPM; C. R. MONTES, Esalq/USP; A. J. MELFI, Esalq/USP. |
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Título: |
Reclaimed wastewater: impact on soil-plant system under tropical conditions. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Journal of Hazardous Materials, v. 192, p. 54-61, 2011. |
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DOI: |
10.1016/j.jhazmat.2011.04.095 |
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Idioma: |
Inglês |
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Conteúdo: |
This study investigated the ionic speciation of reclaimed urban wastewater (RWW), and the impact of increasing RWW irrigation rates on soil properties and plant nutrition under field conditions. Most RWW elements (>66%) are readily available as NH4 +, Ca2+, Mg2+, K+, SO4 2−, Cl−, H3BO3, Mn2+ and Zn2+, but in imbalanced proportion for plant nutrition. Lead, Cd, Cr and Al in RWW are mostly bounded with DOM or OH−..Irrigation with RWW decreased soil acidity, which is beneficial to the acidic tropical soil. Although RWW irrigation builds exchangeable Na+ up, the excessive Na+ was leached out of the soil profile after a rainy summer season (>400 mm). Benefits of the disposal of RWW to the soil under tropical conditions were discussed, however, the over irrigation with RWW (>100% of crop evapotranspiration) led to a nutritional imbalance, accumulating S and leading to a plant deficiency of P and K. |
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Palavras-Chave: |
Acidic soil; Al toxicity; Ionic speciation; Urban effluent; Wastewater disposal. |
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Thesaurus NAL: |
water reuse. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01667naa a2200265 a 4500
001 1901875
005 2019-05-03
008 2011 bl uuuu u00u1 u #d
024 7 $a10.1016/j.jhazmat.2011.04.095$2DOI
100 1 $aPEREIRA, B. F. F.
245 $aReclaimed wastewater$bimpact on soil-plant system under tropical conditions.
260 $c2011
520 $aThis study investigated the ionic speciation of reclaimed urban wastewater (RWW), and the impact of increasing RWW irrigation rates on soil properties and plant nutrition under field conditions. Most RWW elements (>66%) are readily available as NH4 +, Ca2+, Mg2+, K+, SO4 2−, Cl−, H3BO3, Mn2+ and Zn2+, but in imbalanced proportion for plant nutrition. Lead, Cd, Cr and Al in RWW are mostly bounded with DOM or OH−..Irrigation with RWW decreased soil acidity, which is beneficial to the acidic tropical soil. Although RWW irrigation builds exchangeable Na+ up, the excessive Na+ was leached out of the soil profile after a rainy summer season (>400 mm). Benefits of the disposal of RWW to the soil under tropical conditions were discussed, however, the over irrigation with RWW (>100% of crop evapotranspiration) led to a nutritional imbalance, accumulating S and leading to a plant deficiency of P and K.
650 $awater reuse
653 $aAcidic soil
653 $aAl toxicity
653 $aIonic speciation
653 $aUrban effluent
653 $aWastewater disposal
700 1 $aHE, Z. L.
700 1 $aHERPIN, U.
700 1 $aNOGUEIRA, S. F.
700 1 $aMONTES, C. R.
700 1 $aMELFI, A. J.
773 $tJournal of Hazardous Materials$gv. 192, p. 54-61, 2011.
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