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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
15/06/2010 |
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Data da última atualização: |
17/06/2010 |
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Autoria: |
VALLADARES, G. S. |
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Título: |
Caracterização química e granulométrica de solos do Golfão maranhense.
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Acta Amazonica, Manaus, AM, v. 39, n. 4, p. 922-934, dez. 2009. |
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Idioma: |
Português |
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Conteúdo: |
A área de estudo corresponde aos campos flúvio-marinhos com risco de inundação e presença de solos hidromórficos da região do Golfão Maranhense. Os solos dessa região apresentam algum impedimento a drenagem, proximidade com o mar (fonte de sais), condições favoráveis a inundação e aos processos de evaporação. Este conjunto de fatores pode elevar as concentrações de sais solúveis e inviabilizar ou reduzir a produtividade. Foram coletadas 38 amostras de solo em 22 pontos com trado holandês a profundidades variáveis, normalmente de 0 a 20 e de 30 a 50 cm. As amostras foram secas ao ar e analisados atributos químicos e granulométricos. Os solos do golfão maranhense apresentam grande variabilidade e predominam os com argila de atividade alta, alta soma de bases e altos teores de hidrogênio e alumínio. Os teores de magnésio são predominantes em relação aos de cálcio. Apesar da maioria dos solos apresentarem textura argilosa a granulometria é bastante variável. Mesmo com altos teores de magnésio e de sódio o grau de floculação das amostras pode ser considerado alto. Os solos do Golfão Maranhense não se encontram salinizados, porém é necessário manejá-los de maneira adequada para não promover sua salinização.
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Palavras-Chave: |
Argila de atividade alta; Planícies inundáveis; Solo hidromórfico. |
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Categoria do assunto: |
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Marc: |
LEADER 01747naa a2200157 a 4500
001 1070384
005 2010-06-17
008 2009 bl uuuu u00u1 u #d
100 1 $aVALLADARES, G. S.
245 $aCaracterização química e granulométrica de solos do Golfão maranhense.
260 $c2009
520 $aA área de estudo corresponde aos campos flúvio-marinhos com risco de inundação e presença de solos hidromórficos da região do Golfão Maranhense. Os solos dessa região apresentam algum impedimento a drenagem, proximidade com o mar (fonte de sais), condições favoráveis a inundação e aos processos de evaporação. Este conjunto de fatores pode elevar as concentrações de sais solúveis e inviabilizar ou reduzir a produtividade. Foram coletadas 38 amostras de solo em 22 pontos com trado holandês a profundidades variáveis, normalmente de 0 a 20 e de 30 a 50 cm. As amostras foram secas ao ar e analisados atributos químicos e granulométricos. Os solos do golfão maranhense apresentam grande variabilidade e predominam os com argila de atividade alta, alta soma de bases e altos teores de hidrogênio e alumínio. Os teores de magnésio são predominantes em relação aos de cálcio. Apesar da maioria dos solos apresentarem textura argilosa a granulometria é bastante variável. Mesmo com altos teores de magnésio e de sódio o grau de floculação das amostras pode ser considerado alto. Os solos do Golfão Maranhense não se encontram salinizados, porém é necessário manejá-los de maneira adequada para não promover sua salinização.
653 $aArgila de atividade alta
653 $aPlanícies inundáveis
653 $aSolo hidromórfico
773 $tActa Amazonica, Manaus, AM$gv. 39, n. 4, p. 922-934, dez. 2009.
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
09/07/2018 |
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Data da última atualização: |
09/07/2018 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
RAMOS, J. C.; BERTOL, I.; BANDEIRA, D. H.; BARBOSA, F. T.; ZANGISKI, F. |
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Título: |
PATH COEFFICIENT ANALYSIS, A DIFFERENT APPROACH TO IDENTIFY SOIL QUALITY INDICATORS. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
In: CONGRESO SOBRE USO Y MANEJO DEL SUELO, 8., 2018, Corunã, Espanha. Resumos... Coruña, Espanha: Universidade da Coruña, 2018. p. 93 |
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Idioma: |
Inglês |
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Conteúdo: |
The susceptibility to water erosion is inherent to soil quality. Soil quality indicators related to the
reduction of water erosion can help in the decision of which management to adopt, however, the
studies with this purpose are scarce. The aim of this research was to try identify soil quality
indicators with a view to reducing water erosion, with the aid of path coefficient analysis. The
research was carried out in the field between May 2011 and April 2013, in southern Brazil, on a
Humic Dystrudept. In simulated rainfall conditions, the following treatments were studied: 1) no‐
tilled soil, cultivated and covered by residue of ryegrass (Loliummultiflorum) (HCR); 2) no‐tilled
soil, cultivated and covered by residue of vetch (Vicia sativa) (HCV); 3) cultivated and scarified soil
containing ryegrass roots (HRR); 4) cultivated and scarified soil containing vetch roots (HRV); 5)
bare and chiseled soil(BHR). Eight simulated rainfalls events with controlled intensity (65 mm h‐1)
for 90 minutes of duration were applied in each treatment. Were quantified the residue coverage,
surface roughness, soil and water losses, flow velocity and soil physical attributes. By means of
path coefficient analysis it was verified that the coverage and surface roughness, water infiltration
rate and total organic C present a greater direct or indirect relation with soil and water losses and
with the runoff velocity than the others soil variables. Those variables were indicative of soil
quality as to its resistance to water erosion. In a rough soil, the total organic C, the root mass and
the macroporosity of the soil are more important as indicators for soil resistance to water erosion,
while in the presence of soil coverage by cultural residues these properties are less relevant for
the same purpose. MenosThe susceptibility to water erosion is inherent to soil quality. Soil quality indicators related to the
reduction of water erosion can help in the decision of which management to adopt, however, the
studies with this purpose are scarce. The aim of this research was to try identify soil quality
indicators with a view to reducing water erosion, with the aid of path coefficient analysis. The
research was carried out in the field between May 2011 and April 2013, in southern Brazil, on a
Humic Dystrudept. In simulated rainfall conditions, the following treatments were studied: 1) no‐
tilled soil, cultivated and covered by residue of ryegrass (Loliummultiflorum) (HCR); 2) no‐tilled
soil, cultivated and covered by residue of vetch (Vicia sativa) (HCV); 3) cultivated and scarified soil
containing ryegrass roots (HRR); 4) cultivated and scarified soil containing vetch roots (HRV); 5)
bare and chiseled soil(BHR). Eight simulated rainfalls events with controlled intensity (65 mm h‐1)
for 90 minutes of duration were applied in each treatment. Were quantified the residue coverage,
surface roughness, soil and water losses, flow velocity and soil physical attributes. By means of
path coefficient analysis it was verified that the coverage and surface roughness, water infiltration
rate and total organic C present a greater direct or indirect relation with soil and water losses and
with the runoff velocity than the others soil variables. Those variables were indicative of so... Mostrar Tudo |
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Palavras-Chave: |
No tillage; Soil conservation; soil properties. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02502naa a2200205 a 4500
001 1127499
005 2018-07-09
008 2018 bl uuuu u00u1 u #d
100 1 $aRAMOS, J. C.
245 $aPATH COEFFICIENT ANALYSIS, A DIFFERENT APPROACH TO IDENTIFY SOIL QUALITY INDICATORS.$h[electronic resource]
260 $c2018
520 $aThe susceptibility to water erosion is inherent to soil quality. Soil quality indicators related to the reduction of water erosion can help in the decision of which management to adopt, however, the studies with this purpose are scarce. The aim of this research was to try identify soil quality indicators with a view to reducing water erosion, with the aid of path coefficient analysis. The research was carried out in the field between May 2011 and April 2013, in southern Brazil, on a Humic Dystrudept. In simulated rainfall conditions, the following treatments were studied: 1) no‐ tilled soil, cultivated and covered by residue of ryegrass (Loliummultiflorum) (HCR); 2) no‐tilled soil, cultivated and covered by residue of vetch (Vicia sativa) (HCV); 3) cultivated and scarified soil containing ryegrass roots (HRR); 4) cultivated and scarified soil containing vetch roots (HRV); 5) bare and chiseled soil(BHR). Eight simulated rainfalls events with controlled intensity (65 mm h‐1) for 90 minutes of duration were applied in each treatment. Were quantified the residue coverage, surface roughness, soil and water losses, flow velocity and soil physical attributes. By means of path coefficient analysis it was verified that the coverage and surface roughness, water infiltration rate and total organic C present a greater direct or indirect relation with soil and water losses and with the runoff velocity than the others soil variables. Those variables were indicative of soil quality as to its resistance to water erosion. In a rough soil, the total organic C, the root mass and the macroporosity of the soil are more important as indicators for soil resistance to water erosion, while in the presence of soil coverage by cultural residues these properties are less relevant for the same purpose.
653 $aNo tillage
653 $aSoil conservation
653 $asoil properties
700 1 $aBERTOL, I.
700 1 $aBANDEIRA, D. H.
700 1 $aBARBOSA, F. T.
700 1 $aZANGISKI, F.
773 $tIn: CONGRESO SOBRE USO Y MANEJO DEL SUELO, 8., 2018, Corunã, Espanha. Resumos... Coruña, Espanha: Universidade da Coruña, 2018. p. 93
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