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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
13/06/2011 |
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Data da última atualização: |
13/06/2011 |
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Autoria: |
PARRA, J. R. P. |
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Afiliação: |
JOSÉ ROBERTO R. PARRA, ESALQ - USP. |
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Título: |
Reações alérgicas resultantes de trabalhos com colônias de artrópodos em laboratório. |
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Ano de publicação: |
1981 |
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Fonte/Imprenta: |
Ecossistema, v. 6, p. 147-149, set. 1981. |
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Idioma: |
Português |
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Conteúdo: |
Fontes de alergia no levantamento realizado pela Entomological Society of America (ESA). Espécies de Lepidoptera causadoras de alergia e respectiva porcentagem levantamento da ESA. Causas de alergia. Tipo de reação alérgica. |
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Thesagro: |
Alergia. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00611naa a2200133 a 4500
001 1891208
005 2011-06-13
008 1981 bl --- 0-- u #d
100 1 $aPARRA, J. R. P.
245 $aReações alérgicas resultantes de trabalhos com colônias de artrópodos em laboratório.
260 $c1981
520 $aFontes de alergia no levantamento realizado pela Entomological Society of America (ESA). Espécies de Lepidoptera causadoras de alergia e respectiva porcentagem levantamento da ESA. Causas de alergia. Tipo de reação alérgica.
650 $aAlergia
773 $tEcossistema$gv. 6, p. 147-149, set. 1981.
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Embrapa Soja (CNPSO) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Soja. Para informações adicionais entre em contato com valeria.cardoso@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
06/12/2011 |
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Data da última atualização: |
03/08/2017 |
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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: |
CONTE, O.; LEVIEN, R.; DEBIASI, H.; STURMER, S. L. K.; MAZURANA, M.; MULLER, J. |
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Afiliação: |
OSMAR CONTE, UFRGS; RENATO LEVIEN, UFRGS; HENRIQUE DEBIASI, CNPSO; SIDINEI LEANDRO KLOCKNER STURMER, UFRGS; MICHAEL MAZURANA, UFRGS; JÔNATAN MULLER, UFRGS. |
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Título: |
Soil disturbance index as an indicator of seed drill efficiency in no-tillage agrosystems. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Soil & Tillage Research, Amsterdam, v. 114, n. 1, p. 37-42, 2011. |
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DOI: |
http://dx.doi.org/10.1016/j.still.2011.03.007 |
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Idioma: |
Inglês |
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Conteúdo: |
In no-tillage agroecosystems, furrow openers prepare the seed line to place the seeds and fertilizers, and this event represents a unique opportunity to disturb the soil in this kind of crop system. Shanks are used to promote an appropriate soil physical condition, and, in case of soil compaction problems, shanks are used more frequently and at deeper layers of the soil profile. However, this deeper use causes greater draught and does not appropriately disturb the soil because narrow shanks have limited depth performance (critical depth). Here, we tested the operation of shanks in Oxisol and Alfisol. We assessed the shank performance 618 cm of depth, and we evaluated several soil disturbance parameters, such as area of groove, effective depth, and volume, as well as the demand of power force. Based on this evaluation, we calculated the specific power demand and the disturbance index, which is obtained from the ratio of disturbed area and maximum depth. With increasing depth of operation, the specific power demand increased in both soil types, while the disturbance index remaining approximately constant in the Oxisol and decreasing in the Alfisol. In the latter soil type, the shanks operated at more than 12 cm deep, and the lower disturbance index indicated a loss of efficiency in the soil disturbance. Therefore, the disturbance index is an efficient indicator of both the performance of seed drill shanks and the soil disturbance in no-till systems. |
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Thesagro: |
Solo. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02079naa a2200205 a 4500
001 1908690
005 2017-08-03
008 2011 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.1016/j.still.2011.03.007$2DOI
100 1 $aCONTE, O.
245 $aSoil disturbance index as an indicator of seed drill efficiency in no-tillage agrosystems.
260 $c2011
520 $aIn no-tillage agroecosystems, furrow openers prepare the seed line to place the seeds and fertilizers, and this event represents a unique opportunity to disturb the soil in this kind of crop system. Shanks are used to promote an appropriate soil physical condition, and, in case of soil compaction problems, shanks are used more frequently and at deeper layers of the soil profile. However, this deeper use causes greater draught and does not appropriately disturb the soil because narrow shanks have limited depth performance (critical depth). Here, we tested the operation of shanks in Oxisol and Alfisol. We assessed the shank performance 618 cm of depth, and we evaluated several soil disturbance parameters, such as area of groove, effective depth, and volume, as well as the demand of power force. Based on this evaluation, we calculated the specific power demand and the disturbance index, which is obtained from the ratio of disturbed area and maximum depth. With increasing depth of operation, the specific power demand increased in both soil types, while the disturbance index remaining approximately constant in the Oxisol and decreasing in the Alfisol. In the latter soil type, the shanks operated at more than 12 cm deep, and the lower disturbance index indicated a loss of efficiency in the soil disturbance. Therefore, the disturbance index is an efficient indicator of both the performance of seed drill shanks and the soil disturbance in no-till systems.
650 $aSolo
700 1 $aLEVIEN, R.
700 1 $aDEBIASI, H.
700 1 $aSTURMER, S. L. K.
700 1 $aMAZURANA, M.
700 1 $aMULLER, J.
773 $tSoil & Tillage Research, Amsterdam$gv. 114, n. 1, p. 37-42, 2011.
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