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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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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
10/07/2001 |
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Data da última atualização: |
10/07/2001 |
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Autoria: |
FERREIRA, M.F.; SCHLOSSER, J.F.; NEUJAHR, E.B. |
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Título: |
Patinamento de pneus diagonais de um trator 4 x 2, em funcao da variacao da pressao interna e carga na barra de tracao. |
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Ano de publicação: |
0 |
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Fonte/Imprenta: |
Revista Brasileira de Agrociencia, Pelotas, v.6, n.3, p.254-257, set./dez. 2000. |
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Idioma: |
Português |
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Conteúdo: |
Pelas pesquisas as maiores perdas de enrgia ocorrem no contato roda-solo, assim, o comportamento de um trator agricola 4x2 foi analisado quanto aos niveis de patinamento em funcao de diferentes cargas impostas a barra de tracao e diferentes pressoes internas dos pneus. O objetivo foi conhecer as pressoes internas mais adequadas nos pneus motrizes do trator, proporcionando os menores o patinamentos. Com pneus de tracao diagonais, testou-se sete pressoes internas e tres cargas na barra de tracao do trator. A pressao interna recomendada pelo fabricante, de 110kPa, proporcionou os melhores desempenhos em solo firme e em solo solto. Pressoes internas mais baixas reduziram o patinamento na maioria dos casos estudados. |
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Palavras-Chave: |
Patinamento; Pneu; Tracao motorizada; Trator. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01310naa a2200193 a 4500
001 1017210
005 2001-07-10
008 bl uuuu u00u1 u #d
100 1 $aFERREIRA, M.F.
245 $aPatinamento de pneus diagonais de um trator 4 x 2, em funcao da variacao da pressao interna e carga na barra de tracao.
260 $c0
520 $aPelas pesquisas as maiores perdas de enrgia ocorrem no contato roda-solo, assim, o comportamento de um trator agricola 4x2 foi analisado quanto aos niveis de patinamento em funcao de diferentes cargas impostas a barra de tracao e diferentes pressoes internas dos pneus. O objetivo foi conhecer as pressoes internas mais adequadas nos pneus motrizes do trator, proporcionando os menores o patinamentos. Com pneus de tracao diagonais, testou-se sete pressoes internas e tres cargas na barra de tracao do trator. A pressao interna recomendada pelo fabricante, de 110kPa, proporcionou os melhores desempenhos em solo firme e em solo solto. Pressoes internas mais baixas reduziram o patinamento na maioria dos casos estudados.
653 $aPatinamento
653 $aPneu
653 $aTracao motorizada
653 $aTrator
700 1 $aSCHLOSSER, J.F.
700 1 $aNEUJAHR, E.B.
773 $tRevista Brasileira de Agrociencia, Pelotas$gv.6, n.3, p.254-257, set./dez. 2000.
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
25/01/2017 |
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Data da última atualização: |
25/01/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - B |
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Autoria: |
ARAÚJO, E. R.; ALVES, D. P.; KNOTH, J. R. |
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Título: |
Weather-based decision support reduces the fungicide spraying to control onion downy mildew. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Crop Protection, Amsterdam, v. 92, p. 89-92, 2017. |
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Idioma: |
Inglês |
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Conteúdo: |
Onion downy mildew is a major production constraint. Weather-based decision support has been an
important tool for the rational use of fungicides. The present study established a chemical management
strategy of the disease based on temperature and relative humidity. We defined daily severity values
(DSV) according to temperature range (08e13.9 C; 14e21.9 C; 22e29 C) and relative humidity 90% to
carry out the spraying. The treatments mancozeb/copper oxychloride or metalaxyl-M/chlorothalonil
were applied when the summations of the DSV reached the 6e11 range, or 12e17 range, or 18, besides
weekly sprays using these fungicides or water. The area under disease progress curve (AUDPC) and
yield of commercial bulbs were calculated. In both years evaluated (2014, 2015), we managed to reduce
the number of metalaxyl-M/chlorothalonil sprays without compromising commercial yield. In 2014, the
yield values for all treatments using metalaxyl-M/chlorothalonil were significantly higher than those
which used mancozeb/copper oxychloride and control. In fact, with one spray less the routine weekly
application, yield was 48.203 tons per hectare, while following the routine weekly application it was
42.411 tons per hectare. In 2015, we have reduced the number of metalaxyl-M/chlorothalonil sprays by
20%, while maintaining the same levels of AUDPC and yield. For both years, treatments with mancozeb/
copper oxychloride did not differ from the control (water weekly). The rational use of fungicides is a key
element for establishing an integrated production system of onion. MenosOnion downy mildew is a major production constraint. Weather-based decision support has been an
important tool for the rational use of fungicides. The present study established a chemical management
strategy of the disease based on temperature and relative humidity. We defined daily severity values
(DSV) according to temperature range (08e13.9 C; 14e21.9 C; 22e29 C) and relative humidity 90% to
carry out the spraying. The treatments mancozeb/copper oxychloride or metalaxyl-M/chlorothalonil
were applied when the summations of the DSV reached the 6e11 range, or 12e17 range, or 18, besides
weekly sprays using these fungicides or water. The area under disease progress curve (AUDPC) and
yield of commercial bulbs were calculated. In both years evaluated (2014, 2015), we managed to reduce
the number of metalaxyl-M/chlorothalonil sprays without compromising commercial yield. In 2014, the
yield values for all treatments using metalaxyl-M/chlorothalonil were significantly higher than those
which used mancozeb/copper oxychloride and control. In fact, with one spray less the routine weekly
application, yield was 48.203 tons per hectare, while following the routine weekly application it was
42.411 tons per hectare. In 2015, we have reduced the number of metalaxyl-M/chlorothalonil sprays by
20%, while maintaining the same levels of AUDPC and yield. For both years, treatments with mancozeb/
copper oxychloride did not differ from the control (water weekly). The rational use of fungicides is... Mostrar Tudo |
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Palavras-Chave: |
Allium cepa; Peronospora destructor; Rational management. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02123naa a2200181 a 4500
001 1125929
005 2017-01-25
008 2017 bl uuuu u00u1 u #d
100 1 $aARAÚJO, E. R.
245 $aWeather-based decision support reduces the fungicide spraying to control onion downy mildew.$h[electronic resource]
260 $c2017
520 $aOnion downy mildew is a major production constraint. Weather-based decision support has been an important tool for the rational use of fungicides. The present study established a chemical management strategy of the disease based on temperature and relative humidity. We defined daily severity values (DSV) according to temperature range (08e13.9 C; 14e21.9 C; 22e29 C) and relative humidity 90% to carry out the spraying. The treatments mancozeb/copper oxychloride or metalaxyl-M/chlorothalonil were applied when the summations of the DSV reached the 6e11 range, or 12e17 range, or 18, besides weekly sprays using these fungicides or water. The area under disease progress curve (AUDPC) and yield of commercial bulbs were calculated. In both years evaluated (2014, 2015), we managed to reduce the number of metalaxyl-M/chlorothalonil sprays without compromising commercial yield. In 2014, the yield values for all treatments using metalaxyl-M/chlorothalonil were significantly higher than those which used mancozeb/copper oxychloride and control. In fact, with one spray less the routine weekly application, yield was 48.203 tons per hectare, while following the routine weekly application it was 42.411 tons per hectare. In 2015, we have reduced the number of metalaxyl-M/chlorothalonil sprays by 20%, while maintaining the same levels of AUDPC and yield. For both years, treatments with mancozeb/ copper oxychloride did not differ from the control (water weekly). The rational use of fungicides is a key element for establishing an integrated production system of onion.
653 $aAllium cepa
653 $aPeronospora destructor
653 $aRational management
700 1 $aALVES, D. P.
700 1 $aKNOTH, J. R.
773 $tCrop Protection, Amsterdam$gv. 92, p. 89-92, 2017.
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