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 | Acesso ao texto completo restrito à biblioteca da Embrapa Arroz e Feijão. Para informações adicionais entre em contato com cnpaf.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
31/10/1994 |
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Data da última atualização: |
19/06/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
FAGERIA, N. K.; WRIGHT, R. J.; BALIGAR, V. C. |
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Afiliação: |
NAND KUMAR FAGERIA, CNPAF. |
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Título: |
Rice cultivars evaluation for phosphorus use efficiency. |
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Ano de publicação: |
1988 |
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Fonte/Imprenta: |
Plant and Soil, Dordrecht, v.111, p.105-109, 1988. |
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DOI: |
https://doi.org/10.1007/BF02182043 |
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Idioma: |
Inglês |
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Conteúdo: |
Phosphorus deficiency is one of the most growth-limiting factors in acid soils in various parts of the world. The objective of this study was to screen 25 rice cultivars (Oryza sativa L.) at low, medium, and high levels of soil P. Number of tillers, root length, plant height, root dry weight and shoot dry weight were related to tissue P concentrations, P uptake and P-use efficiency. Shoot weight was found to be the plant parameter most sensitive to P deficiency. Significant cultivar differences in P use efficiency were found. Phosphorus use efficiency was higher in roots than shoots and decreased with increasing levels of soil P. Positive correlations were found among growth parameters such as plant height, tillers, root and shoot weight, and P content of roots and shoots. These results indicate selection of rice cultivars for satisfactory performance under low P availability can be carried out using shoot and root dry weight as criteria. |
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Thesagro: |
Arroz; Fósforo; Oryza Sativa. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 01476naa a2200193 a 4500
001 1197869
005 2020-06-19
008 1988 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/BF02182043$2DOI
100 1 $aFAGERIA, N. K.
245 $aRice cultivars evaluation for phosphorus use efficiency.
260 $c1988
520 $aPhosphorus deficiency is one of the most growth-limiting factors in acid soils in various parts of the world. The objective of this study was to screen 25 rice cultivars (Oryza sativa L.) at low, medium, and high levels of soil P. Number of tillers, root length, plant height, root dry weight and shoot dry weight were related to tissue P concentrations, P uptake and P-use efficiency. Shoot weight was found to be the plant parameter most sensitive to P deficiency. Significant cultivar differences in P use efficiency were found. Phosphorus use efficiency was higher in roots than shoots and decreased with increasing levels of soil P. Positive correlations were found among growth parameters such as plant height, tillers, root and shoot weight, and P content of roots and shoots. These results indicate selection of rice cultivars for satisfactory performance under low P availability can be carried out using shoot and root dry weight as criteria.
650 $aArroz
650 $aFósforo
650 $aOryza Sativa
700 1 $aWRIGHT, R. J.
700 1 $aBALIGAR, V. C.
773 $tPlant and Soil, Dordrecht$gv.111, p.105-109, 1988.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Agroindústria Tropical. |
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Data corrente: |
20/09/2011 |
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Data da última atualização: |
02/05/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
MARTINS, M. V. V.; SILVEIRA, S. F.; MAFFIA, L. A.; ROCABADO, J. M. A.; MUSSI-DIAS, V. |
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Afiliação: |
MARLON VAGNER VALENTIM MARTINS, CNPAT; UENF; UFV. |
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Título: |
Chemical control of guava rust (Puccinia psidii) in the Northern Region of Rio de Janeiro State, Brazil. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Australasian Plant Pathology, v. 40, n. 1, p. 48-54, 2011. |
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Idioma: |
Inglês |
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Conteúdo: |
Fungicides were evaluated under field conditions for their efficacy in the control of guava rust (Puccinia psidii); five systemic fungicides (azoxystrobin, pyraclostrobin, cyproconazole, tebuconazole, triadimenol) and the protectant mancozeb. In a first trial, the fungicides were applied at two-week intervals intercalated with bi-weekly sprays of copper oxychloride. The initial incidence of rust on flower buds before treatment was 47%. Triadimenol and azoxystrobin were most effective in reducing the incidence of rust on fruit. The minimum rust incidence achieved with triadimenol was 12% compared to 84% in the control treatment (water). The initial level of rust on flower buds was particularly high for the tebuconazole treatment, which may have contributed to the ineffective control by this fungicide in the first trial. In the second trial, copper oxychloride sprays were applied when disease incidence on flower buds was low (7%). Azoxystrobin, tebuconazole, triadimenol and mancozeb treatments were started nine days after a second application of copper oxychloride. The fungicides were then applied at bi-weekly intervals and at the same concentrations as in the first trial. Triadimenol was again most effective in controlling rust, although its effect did not greatly differ from that of tebuconazole. The maximum disease incidence in all fungicide treatments was significantly lower than that observed in the control treatment. |
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Palavras-Chave: |
Yield losses. |
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Thesagro: |
Psidium Guajava. |
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Thesaurus NAL: |
fungicides. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/42152/1/AB111003.pdf
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Marc: |
LEADER 02050naa a2200205 a 4500
001 1900972
005 2017-05-02
008 2011 bl uuuu u00u1 u #d
100 1 $aMARTINS, M. V. V.
245 $aChemical control of guava rust (Puccinia psidii) in the Northern Region of Rio de Janeiro State, Brazil.
260 $c2011
520 $aFungicides were evaluated under field conditions for their efficacy in the control of guava rust (Puccinia psidii); five systemic fungicides (azoxystrobin, pyraclostrobin, cyproconazole, tebuconazole, triadimenol) and the protectant mancozeb. In a first trial, the fungicides were applied at two-week intervals intercalated with bi-weekly sprays of copper oxychloride. The initial incidence of rust on flower buds before treatment was 47%. Triadimenol and azoxystrobin were most effective in reducing the incidence of rust on fruit. The minimum rust incidence achieved with triadimenol was 12% compared to 84% in the control treatment (water). The initial level of rust on flower buds was particularly high for the tebuconazole treatment, which may have contributed to the ineffective control by this fungicide in the first trial. In the second trial, copper oxychloride sprays were applied when disease incidence on flower buds was low (7%). Azoxystrobin, tebuconazole, triadimenol and mancozeb treatments were started nine days after a second application of copper oxychloride. The fungicides were then applied at bi-weekly intervals and at the same concentrations as in the first trial. Triadimenol was again most effective in controlling rust, although its effect did not greatly differ from that of tebuconazole. The maximum disease incidence in all fungicide treatments was significantly lower than that observed in the control treatment.
650 $afungicides
650 $aPsidium Guajava
653 $aYield losses
700 1 $aSILVEIRA, S. F.
700 1 $aMAFFIA, L. A.
700 1 $aROCABADO, J. M. A.
700 1 $aMUSSI-DIAS, V.
773 $tAustralasian Plant Pathology$gv. 40, n. 1, p. 48-54, 2011.
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Registro original: |
Embrapa Agroindústria Tropical (CNPAT) |
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