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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal; Embrapa Trigo. |
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Data corrente: |
04/03/1999 |
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Data da última atualização: |
04/03/1999 |
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Autoria: |
OJENIYI, S. O.; DEXTER, A. R. |
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Afiliação: |
Waite Agricultural Research Institute, Glen Osmond, South Australia. |
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Título: |
Effect of soil structure on soil water status. |
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Ano de publicação: |
1984 |
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Fonte/Imprenta: |
Soil & Tillage Research, v.4, n.4, p.371-379, 1984. |
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Idioma: |
Inglês |
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Conteúdo: |
Although the need for research into soil structural features responsible for water loss from soil is recognised, the research has been hampered by the lack of suitable techniquesfor measuring in situ soil macrostructure. Therefore, in a field experiment, structural parameters obtained from eight differently tilled (loam) soils in winter and spring were correlated with gravimetric soil water content (at 5 and 10-cm depths) and evaporative water loss during daylight hours. Percentage of voids and aggregates of different sizes, mean aggregate size, mean void size and macroporosity percentage were all calculated from structural data obtained from sectioned blocks of soil that were impregnated with paraffin wax in the field. Significant negative correlations were observed between soil water content, and percentage of 4-8 and 8-16-nm voids, mean aggregate size and macroporosity percentage, especially in winter when there are long periods without precipitation. However, inverse relationships were detected between evaporative water loss during daylight hours on selected days and mean aggregate size, mean void size and macroporosity percentage. But evaporative water loss during daylight hours apparently did not influence water content of bare soil with coarse strucutre at the surface. |
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Palavras-Chave: |
Estrutura; Structure. |
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Thesagro: |
Água; Solo. |
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Thesaurus Nal: |
soil; water. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01786naa a2200205 a 4500
001 1793963
005 1999-03-04
008 1984 bl --- 0-- u #d
100 1 $aOJENIYI, S. O.
245 $aEffect of soil structure on soil water status.
260 $c1984
520 $aAlthough the need for research into soil structural features responsible for water loss from soil is recognised, the research has been hampered by the lack of suitable techniquesfor measuring in situ soil macrostructure. Therefore, in a field experiment, structural parameters obtained from eight differently tilled (loam) soils in winter and spring were correlated with gravimetric soil water content (at 5 and 10-cm depths) and evaporative water loss during daylight hours. Percentage of voids and aggregates of different sizes, mean aggregate size, mean void size and macroporosity percentage were all calculated from structural data obtained from sectioned blocks of soil that were impregnated with paraffin wax in the field. Significant negative correlations were observed between soil water content, and percentage of 4-8 and 8-16-nm voids, mean aggregate size and macroporosity percentage, especially in winter when there are long periods without precipitation. However, inverse relationships were detected between evaporative water loss during daylight hours on selected days and mean aggregate size, mean void size and macroporosity percentage. But evaporative water loss during daylight hours apparently did not influence water content of bare soil with coarse strucutre at the surface.
650 $asoil
650 $awater
650 $aÁgua
650 $aSolo
653 $aEstrutura
653 $aStructure
700 1 $aDEXTER, A. R.
773 $tSoil & Tillage Research$gv.4, n.4, p.371-379, 1984.
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Registro original: |
Embrapa Pantanal (CPAP) |
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