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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados; Embrapa Gado de Corte; Embrapa Mandioca e Fruticultura; Embrapa Soja; Embrapa Solos; Embrapa Trigo. |
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Data corrente: |
18/12/1995 |
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Data da última atualização: |
10/05/1996 |
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Autoria: |
LOPES, A. S. |
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Título: |
A survey of the fertility status of soils under cerrado vegetation in Brazil. |
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Ano de publicação: |
1975 |
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Fonte/Imprenta: |
Raleigh: North Carolina State University, 1975. |
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Páginas: |
138p. |
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Idioma: |
Inglês |
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Notas: |
Tese Mestrado. |
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Conteúdo: |
Soil under natural "cerrado" vegetation were surveyed for their fertility status. A total of 518 toposoil samples were collected from a 600,000-square kilometer area in central Brazil. The samples were characterized for soil pH, Al, nutrient (including micronutrient), and organic matter levels, effective cation exchange capacity (CEC), texture, and color (hue, value, and chroma). The range, median, and relative frequency distribution were calculated for each soil property. The soils typically have a pH of 4.8 to 5.2 and an organic matter level of 1.5 to 3.0%. They have extremely low values of effective CEC and extractable calcium, magnesium, phosphorus, zinc, and probably copper. The degree of aluminum saturation in the samples, however, was high, as ere the levels of extractable iron and manganese. there was a broad range in the textura of these soils. The natural vegetation was also classified at the site each soil sample was taken, and this was used to estimate productivity. Correlation and regression procedures were conducted to determine the relation between vegetation and the various soil properties. The correlation procedure indicated a positive relation between the amount of vegetation and the following (in order of degree of importance); zinc, magnesium, effective CEC, clacium, pH, phosphorus, potassium, copper, chrom, and organic matter level. There was a negative relation between the amount of vegetation and hue, value, percent aluminum saturation, silt/clay ratio, silt, and iron level. Multiple regression analyses were conducted to further elucidate the relation between amount of vegetation and soil properties. The results indicated that groups of variables were important. They were (1) chemical variables (phosphorus, zinc, and magnesium), (2) texture variables (silt/clay ratio and sand), (3) color variables (hue and chroma). The amount of vegetation was positively related to each of these properties except silt/clay ratio. Additional insight regarding each important chemical variable was obtained by relating the phosphorus, sinc, and magnesium levels to other soil properties. Numerous variables and interactions among variables appeared related to the native phosphorus status of these soils. Manganese level, color variables, and their interactions seemed somwhat more important than other variables, and their interactions seemed somwhat more important than other variables in this case. The zinc status of these soils was largely related to cation exchange capacity and factors associated with it, such as organic matter and soil pH. Zinc level was also generally higher if the manganese level in the soil was high. This may be an indication of differences in parent material. The magnesium status of these soils was found to be very closely related to the cation exchange capacity, calcium level, and percent aluminum saturation MenosSoil under natural "cerrado" vegetation were surveyed for their fertility status. A total of 518 toposoil samples were collected from a 600,000-square kilometer area in central Brazil. The samples were characterized for soil pH, Al, nutrient (including micronutrient), and organic matter levels, effective cation exchange capacity (CEC), texture, and color (hue, value, and chroma). The range, median, and relative frequency distribution were calculated for each soil property. The soils typically have a pH of 4.8 to 5.2 and an organic matter level of 1.5 to 3.0%. They have extremely low values of effective CEC and extractable calcium, magnesium, phosphorus, zinc, and probably copper. The degree of aluminum saturation in the samples, however, was high, as ere the levels of extractable iron and manganese. there was a broad range in the textura of these soils. The natural vegetation was also classified at the site each soil sample was taken, and this was used to estimate productivity. Correlation and regression procedures were conducted to determine the relation between vegetation and the various soil properties. The correlation procedure indicated a positive relation between the amount of vegetation and the following (in order of degree of importance); zinc, magnesium, effective CEC, clacium, pH, phosphorus, potassium, copper, chrom, and organic matter level. There was a negative relation between the amount of vegetation and hue, value, percent aluminum saturation, silt/... Mostrar Tudo |
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Palavras-Chave: |
Tese. |
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Thesagro: |
Cerrado; Fertilidade do Solo; Solo. |
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Thesaurus Nal: |
Brazil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03398nam a2200193 a 4500
001 1551753
005 1996-05-10
008 1975 bl uuuu m 00u1 u #d
100 1 $aLOPES, A. S.
245 $aA survey of the fertility status of soils under cerrado vegetation in Brazil.
260 $aRaleigh: North Carolina State University$c1975
300 $a138p.
500 $aTese Mestrado.
520 $aSoil under natural "cerrado" vegetation were surveyed for their fertility status. A total of 518 toposoil samples were collected from a 600,000-square kilometer area in central Brazil. The samples were characterized for soil pH, Al, nutrient (including micronutrient), and organic matter levels, effective cation exchange capacity (CEC), texture, and color (hue, value, and chroma). The range, median, and relative frequency distribution were calculated for each soil property. The soils typically have a pH of 4.8 to 5.2 and an organic matter level of 1.5 to 3.0%. They have extremely low values of effective CEC and extractable calcium, magnesium, phosphorus, zinc, and probably copper. The degree of aluminum saturation in the samples, however, was high, as ere the levels of extractable iron and manganese. there was a broad range in the textura of these soils. The natural vegetation was also classified at the site each soil sample was taken, and this was used to estimate productivity. Correlation and regression procedures were conducted to determine the relation between vegetation and the various soil properties. The correlation procedure indicated a positive relation between the amount of vegetation and the following (in order of degree of importance); zinc, magnesium, effective CEC, clacium, pH, phosphorus, potassium, copper, chrom, and organic matter level. There was a negative relation between the amount of vegetation and hue, value, percent aluminum saturation, silt/clay ratio, silt, and iron level. Multiple regression analyses were conducted to further elucidate the relation between amount of vegetation and soil properties. The results indicated that groups of variables were important. They were (1) chemical variables (phosphorus, zinc, and magnesium), (2) texture variables (silt/clay ratio and sand), (3) color variables (hue and chroma). The amount of vegetation was positively related to each of these properties except silt/clay ratio. Additional insight regarding each important chemical variable was obtained by relating the phosphorus, sinc, and magnesium levels to other soil properties. Numerous variables and interactions among variables appeared related to the native phosphorus status of these soils. Manganese level, color variables, and their interactions seemed somwhat more important than other variables, and their interactions seemed somwhat more important than other variables in this case. The zinc status of these soils was largely related to cation exchange capacity and factors associated with it, such as organic matter and soil pH. Zinc level was also generally higher if the manganese level in the soil was high. This may be an indication of differences in parent material. The magnesium status of these soils was found to be very closely related to the cation exchange capacity, calcium level, and percent aluminum saturation
650 $aBrazil
650 $aCerrado
650 $aFertilidade do Solo
650 $aSolo
653 $aTese
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Registro original: |
Embrapa Cerrados (CPAC) |
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| Registros recuperados : 685 | |
| 4. |  | LOPES, A. C. A. Análise de sementes de hortaliças. In: GUEDES, I. M. R.; VIDAL, M. C. (Ed.). Curso internacional sobre produção sustentável de hortaliças: módulo 2 produção sustentável de hortaliças. Embrapa: Brasília, DF, 2012. p. 38-41.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Hortaliças. |
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| 5. | | LOPES, A. de M. Arroz de sequeiro no Estado do Pará. In: EMBRAPA AMAZÔNIA ORIENTAL. Programa de melhoramento genético e de adaptação de espécies vegetais para a Amazônia Oriental. Belém, PA, 1999. p. 49-55. (Embrapa Amazônia Oriental. Documentos, 16).| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 6. | | LOPES, A. de M. Arroz de várzea no Estado do Pará. In: EMBRAPA AMAZÔNIA ORIENTAL. Programa de melhoramento genético e de adaptação de espécies vegetais para a Amazônia Oriental. Belém, PA, 1999. p. 57-63. (Embrapa Amazônia Oriental. Documentos, 16).| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 7. | | LOPES, A. C. Ardume, picância, pungência. In: RIBEIRO, C. S. da C.; LOPES, A. C.; CARVALHO, S. I. de; HENZ, G. P.; REIFSCHNEIDER, F. J. B. (Ed.). Pimentas Capsicum. Brasília, DF: Embrapa Hortaliças, 2008. p. 25-30| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Hortaliças. |
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| 11. | | LOPES, A. C. A. Amostragem em sementes de hortaliças In: CURSO SOBRE TECNOLOGIA DE PRODUÇÃO DE SEMENTES DE HORTALIÇAS, 9., 2009, Juazeiro, Petrolina. Palestras... Brasília, DF: Embrapa Hortaliças, 2009. CD-ROM.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Hortaliças. |
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| Registros recuperados : 685 | |
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