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Registro Completo |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
25/10/2005 |
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Data da última atualização: |
25/10/2005 |
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Autoria: |
ARGOLO, P. S.; NORONHA, A. C. da S.; OLIVEIRA, V. de S. de; FUKUDA, W. M. G. |
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Afiliação: |
UFBA; EMBRAPA-CNPMF. |
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Título: |
Aspectos da biologia e preferência para alimentação e oviposição de Mononychellus tanajoa (Bondar, 1938) em quatro variedades de mandioca. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Magistra, Cruz das Almas, v.17, n.1, p. 23-27, jan./abr. 2005. |
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ISSN: |
0102-5333 |
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Idioma: |
Português |
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Conteúdo: |
Estudou-se a biologia e a preferência do ácaro verde da mandioca, Mononychellus tanajoa (Bondar, 1938) (Acari:Tetranychidae), em variedades de mandioca (Manihot esculenta Crantz). O estudo foi conduzido em laboratório, a 2±1°C, 56±2% de umidade relativa e 12 horas de fotofase. Foram utilizadas quatro variedades de mandioca: Pretinha, Engana Ladrão, Do Céu e Sacai. Os períodos de ovo-adulto variaram de 11,7 a 12,4 dias. O percentual de sobrevivência dos estádios imaturos foi maior na variedade Pretinha (76,7%). O menor período de oviposição e de longevidade de fêmeas ocorreu na variedade Do Céu em 4,9 e 5,7 dias, respectivamente, diferindo significativamente em relação às demais variedades. A razão sexual variou de 57% a 82% de fêmeas. No ensaio de preferência para alimentação e oviposição, maior número de ovos foi verificado na variedade Sacai (5,9), seguida da variedade Pretinha (5,0), entretanto não foi constatada diferença significativa entre as variedades testadas. |
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Thesagro: |
Ácaro Verde; Manihot Esculenta. |
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Thesaurus Nal: |
Acari. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01661naa a2200205 a 4500
001 1653038
005 2005-10-25
008 2005 bl uuuu u00u1 u #d
022 $a0102-5333
100 1 $aARGOLO, P. S.
245 $aAspectos da biologia e preferência para alimentação e oviposição de Mononychellus tanajoa (Bondar, 1938) em quatro variedades de mandioca.
260 $c2005
520 $aEstudou-se a biologia e a preferência do ácaro verde da mandioca, Mononychellus tanajoa (Bondar, 1938) (Acari:Tetranychidae), em variedades de mandioca (Manihot esculenta Crantz). O estudo foi conduzido em laboratório, a 2±1°C, 56±2% de umidade relativa e 12 horas de fotofase. Foram utilizadas quatro variedades de mandioca: Pretinha, Engana Ladrão, Do Céu e Sacai. Os períodos de ovo-adulto variaram de 11,7 a 12,4 dias. O percentual de sobrevivência dos estádios imaturos foi maior na variedade Pretinha (76,7%). O menor período de oviposição e de longevidade de fêmeas ocorreu na variedade Do Céu em 4,9 e 5,7 dias, respectivamente, diferindo significativamente em relação às demais variedades. A razão sexual variou de 57% a 82% de fêmeas. No ensaio de preferência para alimentação e oviposição, maior número de ovos foi verificado na variedade Sacai (5,9), seguida da variedade Pretinha (5,0), entretanto não foi constatada diferença significativa entre as variedades testadas.
650 $aAcari
650 $aÁcaro Verde
650 $aManihot Esculenta
700 1 $aNORONHA, A. C. da S.
700 1 $aOLIVEIRA, V. de S. de
700 1 $aFUKUDA, W. M. G.
773 $tMagistra, Cruz das Almas$gv.17, n.1, p. 23-27, jan./abr. 2005.
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Agrobiologia. Para informações adicionais entre em contato com cnpab.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
29/12/1999 |
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Data da última atualização: |
31/05/2007 |
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Autoria: |
CANTARUTTI, R. B.; TARRE, R.; MACEDO, R.; CADISCH, G.; REZENDE, C. de P.; PEREIRA, J. M.; BRAGA, J. M.; GOMIDE, J. A.; FERREIRA, E.; ALVES, B. J. R.; URQUIAGA, S.; BODDEY, R. M. |
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Título: |
The effect of grazing intensity and the presence of a forage legume on nitrogen dynamics in Brachiaria pastures in the Atlantic forest region of the South of Bahia, Brazil. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Nutrient Cycling in Agroecossytems, Netherlands, v. 64, p. 257-271, 2002. |
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Idioma: |
Inglês |
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Conteúdo: |
It has been shown that with careful grazing management and addition of p and K. but not N. fertilisers Brachiaria pastures are able to maintain sustainable live weight gains over many years. However. standard on-farm practice. which generally involves high stocking rates. leads after a few years to pasture decline due mainly to N deficiency for grass regrowth. To generate an understanding of the mechanism of pasture decline and possible management options to mitigate this process. a study was performed in the Atlantic forest region of the south of Bahia state to study the N dynamics in pastures of Brachiaria humidicola subject to three different stocking rates of beef cattle. with and without the presence of the forage legume Desmodium ovalifolium. Despite the fact that the C:N ratio of the deposited litter was high (60 to 70) the rate of decomposition was very rapid (k --0.07 9 g-l day-1) and annual rates of N turnover through the litter pathway were between 105 and 170 kg N ha-1 year-1. In the grass-only pastures as stocking rate increased from 2 to 3 head ha -1. N recycled in the litter decreased by 11 %. but a further increase to 4 head ha-1 decreased N recycling by 30% suggesting that beyond a certain critical level higher grazing stocking rates would lead to pasture decline if there was no N addition. High stocking rates decreased the proportion of the legume in the sward. but at all rates the concentration of N in both the green and dead grass in the forage on offer and in the litter was higher in the mixed sward. The presence of the legume caused a decrease in the C:N ratio of the microbial biomass while both soil N minera1isation and nitrification increased. This increased rate of turnover of the microbia1 biomass and the contribution of N2 fixation to the legume resulted in large increases in the N recycled via litter deposition ranging from 42 to 155 kg N ha-1 year-1. MenosIt has been shown that with careful grazing management and addition of p and K. but not N. fertilisers Brachiaria pastures are able to maintain sustainable live weight gains over many years. However. standard on-farm practice. which generally involves high stocking rates. leads after a few years to pasture decline due mainly to N deficiency for grass regrowth. To generate an understanding of the mechanism of pasture decline and possible management options to mitigate this process. a study was performed in the Atlantic forest region of the south of Bahia state to study the N dynamics in pastures of Brachiaria humidicola subject to three different stocking rates of beef cattle. with and without the presence of the forage legume Desmodium ovalifolium. Despite the fact that the C:N ratio of the deposited litter was high (60 to 70) the rate of decomposition was very rapid (k --0.07 9 g-l day-1) and annual rates of N turnover through the litter pathway were between 105 and 170 kg N ha-1 year-1. In the grass-only pastures as stocking rate increased from 2 to 3 head ha -1. N recycled in the litter decreased by 11 %. but a further increase to 4 head ha-1 decreased N recycling by 30% suggesting that beyond a certain critical level higher grazing stocking rates would lead to pasture decline if there was no N addition. High stocking rates decreased the proportion of the legume in the sward. but at all rates the concentration of N in both the green and dead grass in the forage on offer a... Mostrar Tudo |
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Thesagro: |
Brachiaria; Leguminosa Forrageira. |
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Thesaurus NAL: |
forage legumes. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02805naa a2200289 a 4500
001 1624177
005 2007-05-31
008 2002 bl --- 0-- u #d
100 1 $aCANTARUTTI, R. B.
245 $aThe effect of grazing intensity and the presence of a forage legume on nitrogen dynamics in Brachiaria pastures in the Atlantic forest region of the South of Bahia, Brazil.
260 $c2002
520 $aIt has been shown that with careful grazing management and addition of p and K. but not N. fertilisers Brachiaria pastures are able to maintain sustainable live weight gains over many years. However. standard on-farm practice. which generally involves high stocking rates. leads after a few years to pasture decline due mainly to N deficiency for grass regrowth. To generate an understanding of the mechanism of pasture decline and possible management options to mitigate this process. a study was performed in the Atlantic forest region of the south of Bahia state to study the N dynamics in pastures of Brachiaria humidicola subject to three different stocking rates of beef cattle. with and without the presence of the forage legume Desmodium ovalifolium. Despite the fact that the C:N ratio of the deposited litter was high (60 to 70) the rate of decomposition was very rapid (k --0.07 9 g-l day-1) and annual rates of N turnover through the litter pathway were between 105 and 170 kg N ha-1 year-1. In the grass-only pastures as stocking rate increased from 2 to 3 head ha -1. N recycled in the litter decreased by 11 %. but a further increase to 4 head ha-1 decreased N recycling by 30% suggesting that beyond a certain critical level higher grazing stocking rates would lead to pasture decline if there was no N addition. High stocking rates decreased the proportion of the legume in the sward. but at all rates the concentration of N in both the green and dead grass in the forage on offer and in the litter was higher in the mixed sward. The presence of the legume caused a decrease in the C:N ratio of the microbial biomass while both soil N minera1isation and nitrification increased. This increased rate of turnover of the microbia1 biomass and the contribution of N2 fixation to the legume resulted in large increases in the N recycled via litter deposition ranging from 42 to 155 kg N ha-1 year-1.
650 $aforage legumes
650 $aBrachiaria
650 $aLeguminosa Forrageira
700 1 $aTARRE, R.
700 1 $aMACEDO, R.
700 1 $aCADISCH, G.
700 1 $aREZENDE, C. de P.
700 1 $aPEREIRA, J. M.
700 1 $aBRAGA, J. M.
700 1 $aGOMIDE, J. A.
700 1 $aFERREIRA, E.
700 1 $aALVES, B. J. R.
700 1 $aURQUIAGA, S.
700 1 $aBODDEY, R. M.
773 $tNutrient Cycling in Agroecossytems, Netherlands$gv. 64, p. 257-271, 2002.
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