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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
28/12/2016 |
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Data da última atualização: |
28/12/2016 |
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Autoria: |
QUEIROZ, J. S. de; NORTON, B. E. |
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Afiliação: |
João Stacishin de Queiroz; Brien E. Norton. |
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Título: |
An assessment of an indigenous soil classification used in the caatinga region of Ceara State, Northeast Brazil. |
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Ano de publicação: |
1992 |
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Fonte/Imprenta: |
Agricultural Systems, v. 39 n. 3, p. 289-305, 1992. |
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DOI: |
10.1016/0308-521X(92)90101-S |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: An indigenous soil classification used in the caatinga region of Ceara State, Northeast Brazil, was mastered in the course of a resource inventory in the Acarau Valley. This paper considers its validity using (1) its usefulness as a tool for objectively grouping soils; and (2) the strength of the link between soil quality and class membership. Cluster analyses using morphological attributes from 36 profiles were used to determine how well the classification met the first criterion; percentage moisture equivalent and pH values were examined to assess the classification in terms of the second criterion. The classification's limitations and potential for wider geographic application were assessed in conjunction with a farm survey covering a larger portion of Ceara State. The cluster analyses produced three major clusters that corresponded closely to the broad classes of the indigenous soil classification. This corroborated the validity of the indigenous classification as a tool for objectively grouping morphologically similar soils. However, it was noticed that class names, although extensively used, may have different meanings in physiographically contrasting regions. Because of this it is necessary to establish the local relationship between class name and soil characteristics. Intra-cluster percentage moisture equivalent and pH values varied widely but tended to concentrate in relatively narrow areas of the range of values for all three clusters. This demonstrated the usefulness of the indigenous classification as a framework to group soils physicochemically. MenosAbstract: An indigenous soil classification used in the caatinga region of Ceara State, Northeast Brazil, was mastered in the course of a resource inventory in the Acarau Valley. This paper considers its validity using (1) its usefulness as a tool for objectively grouping soils; and (2) the strength of the link between soil quality and class membership. Cluster analyses using morphological attributes from 36 profiles were used to determine how well the classification met the first criterion; percentage moisture equivalent and pH values were examined to assess the classification in terms of the second criterion. The classification's limitations and potential for wider geographic application were assessed in conjunction with a farm survey covering a larger portion of Ceara State. The cluster analyses produced three major clusters that corresponded closely to the broad classes of the indigenous soil classification. This corroborated the validity of the indigenous classification as a tool for objectively grouping morphologically similar soils. However, it was noticed that class names, although extensively used, may have different meanings in physiographically contrasting regions. Because of this it is necessary to establish the local relationship between class name and soil characteristics. Intra-cluster percentage moisture equivalent and pH values varied widely but tended to concentrate in relatively narrow areas of the range of values for all three clusters. This demonstrated ... Mostrar Tudo |
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Palavras-Chave: |
Acarau Valley; Brasil; Ceará; Indigenous lands; Região Nordeste; Terra Indígena; Vale do Acaraú. |
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Thesagro: |
Caatinga; Classificação do solo; Vegetação. |
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Thesaurus Nal: |
Soil classification. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02401naa a2200277 a 4500
001 2059556
005 2016-12-28
008 1992 bl uuuu u00u1 u #d
024 7 $a10.1016/0308-521X(92)90101-S$2DOI
100 1 $aQUEIROZ, J. S. de
245 $aAn assessment of an indigenous soil classification used in the caatinga region of Ceara State, Northeast Brazil.
260 $c1992
520 $aAbstract: An indigenous soil classification used in the caatinga region of Ceara State, Northeast Brazil, was mastered in the course of a resource inventory in the Acarau Valley. This paper considers its validity using (1) its usefulness as a tool for objectively grouping soils; and (2) the strength of the link between soil quality and class membership. Cluster analyses using morphological attributes from 36 profiles were used to determine how well the classification met the first criterion; percentage moisture equivalent and pH values were examined to assess the classification in terms of the second criterion. The classification's limitations and potential for wider geographic application were assessed in conjunction with a farm survey covering a larger portion of Ceara State. The cluster analyses produced three major clusters that corresponded closely to the broad classes of the indigenous soil classification. This corroborated the validity of the indigenous classification as a tool for objectively grouping morphologically similar soils. However, it was noticed that class names, although extensively used, may have different meanings in physiographically contrasting regions. Because of this it is necessary to establish the local relationship between class name and soil characteristics. Intra-cluster percentage moisture equivalent and pH values varied widely but tended to concentrate in relatively narrow areas of the range of values for all three clusters. This demonstrated the usefulness of the indigenous classification as a framework to group soils physicochemically.
650 $aSoil classification
650 $aCaatinga
650 $aClassificação do solo
650 $aVegetação
653 $aAcarau Valley
653 $aBrasil
653 $aCeará
653 $aIndigenous lands
653 $aRegião Nordeste
653 $aTerra Indígena
653 $aVale do Acaraú
700 1 $aNORTON, B. E.
773 $tAgricultural Systems$gv. 39 n. 3, p. 289-305, 1992.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Algodão. Para informações adicionais entre em contato com cnpa.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Algodão. |
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Data corrente: |
22/01/2008 |
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Data da última atualização: |
22/01/2008 |
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Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
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Circulação/Nível: |
-- - -- |
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Autoria: |
FERREIRA, G. B.; SEVERINO, L. S. |
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Afiliação: |
Gilvan Barbosa Ferreira, Embrapa Algodão; Liv Soares Severino, Embrapa Algodão. |
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Título: |
Nutrición y fertilidad del suelo. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
In: SEVERINO, L. S.; MILANI, M.; BELTRÃO, N. E. de M. Ricino : el productor pregunta, la Embrapa responde. Brasília, DF : Embrapa Información Tecnológica, 2007. |
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Páginas: |
p. 43-78 |
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Série: |
(Colección 500 preguntas, 500 respuestas). |
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ISBN: |
978-85-7383-390-4 |
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Idioma: |
Espanhol |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00558naa a2200157 a 4500
001 1276335
005 2008-01-22
008 2007 bl uuuu u00u1 u #d
020 $a978-85-7383-390-4
100 1 $aFERREIRA, G. B.
245 $aNutrición y fertilidad del suelo.
260 $c2007
300 $ap. 43-78
490 $a(Colección 500 preguntas, 500 respuestas).
700 1 $aSEVERINO, L. S.
773 $tIn: SEVERINO, L. S.; MILANI, M.; BELTRÃO, N. E. de M. Ricino : el productor pregunta, la Embrapa responde. Brasília, DF : Embrapa Información Tecnológica, 2007.
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Embrapa Algodão (CNPA) |
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