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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte; Embrapa Mandioca e Fruticultura; Embrapa Solos. |
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Data corrente: |
13/11/1997 |
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Data da última atualização: |
15/01/2014 |
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Autoria: |
VOLKWEISS, S. J. |
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Título: |
factors affecting phosphate sorption by soils and minerals. |
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Ano de publicação: |
1973 |
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Fonte/Imprenta: |
University of Wisconsin, 1973. |
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Idioma: |
Inglês
Português |
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Notas: |
Tese Doutorado. |
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Conteúdo: |
The objectives of this research were to study the P sorption characteristics of soils and the effects of pH and of cation type and concentration on P sorption by soils and minerals. In an attempt to characterize the nature and properties of P sorption sites of soils, P sorption isotherms in a 0.1 N NaC1 system were obtained for six limed and unlimed agricultural soils from Rio Grande do Sul, Brazil. The equilibration time was 48 hours and the concentration of P in the final solution varied from near zero to 20 ugP/ml. Langmuir plots (c/x vs c) of the data resulted in curvilinear and/or multi-straight line relationships suggesting the presence of 2 or more populations of sites with different affinities for P. An iterative multiple regression analysis computer program that assumes that each population of site follows the Langmuir equation was used to analyze the sorption data. Three populations of sites with different affinities for P were detected and the Langmuir constants, k (binding energy term) and b (sorption maximum) were estimated for each population of sites. The median and range for values of k (ml/ug P) and b (ugP/g) for the three populations of site were in decreasing order of affinity for P:K1 = 140, (40-2870) and b1=120 (8-370); K2=2.4, (0.63-10) and b2=174, (25-704); and K3 =0.095, (0.051-0.27) and b3=763 (131-1460). On the average, the total number of P sorption sites (total) was made up of 10% of sites with high affinity for P, 22% with moderate and 68% with low affinity.............................. MenosThe objectives of this research were to study the P sorption characteristics of soils and the effects of pH and of cation type and concentration on P sorption by soils and minerals. In an attempt to characterize the nature and properties of P sorption sites of soils, P sorption isotherms in a 0.1 N NaC1 system were obtained for six limed and unlimed agricultural soils from Rio Grande do Sul, Brazil. The equilibration time was 48 hours and the concentration of P in the final solution varied from near zero to 20 ugP/ml. Langmuir plots (c/x vs c) of the data resulted in curvilinear and/or multi-straight line relationships suggesting the presence of 2 or more populations of sites with different affinities for P. An iterative multiple regression analysis computer program that assumes that each population of site follows the Langmuir equation was used to analyze the sorption data. Three populations of sites with different affinities for P were detected and the Langmuir constants, k (binding energy term) and b (sorption maximum) were estimated for each population of sites. The median and range for values of k (ml/ug P) and b (ugP/g) for the three populations of site were in decreasing order of affinity for P:K1 = 140, (40-2870) and b1=120 (8-370); K2=2.4, (0.63-10) and b2=174, (25-704); and K3 =0.095, (0.051-0.27) and b3=763 (131-1460). On the average, the total number of P sorption sites (total) was made up of 10% of sites with high affinity for P, 22% with moderate and 68% with l... Mostrar Tudo |
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Palavras-Chave: |
Solos. |
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Thesagro: |
Fertilidade; Física; Química. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01965nam a2200169 a 4500
001 1321690
005 2014-01-15
008 1973 bl uuuu m 00u1 u #d
100 1 $aVOLKWEISS, S. J.
245 $afactors affecting phosphate sorption by soils and minerals.
260 $aUniversity of Wisconsin$c1973
500 $aTese Doutorado.
520 $aThe objectives of this research were to study the P sorption characteristics of soils and the effects of pH and of cation type and concentration on P sorption by soils and minerals. In an attempt to characterize the nature and properties of P sorption sites of soils, P sorption isotherms in a 0.1 N NaC1 system were obtained for six limed and unlimed agricultural soils from Rio Grande do Sul, Brazil. The equilibration time was 48 hours and the concentration of P in the final solution varied from near zero to 20 ugP/ml. Langmuir plots (c/x vs c) of the data resulted in curvilinear and/or multi-straight line relationships suggesting the presence of 2 or more populations of sites with different affinities for P. An iterative multiple regression analysis computer program that assumes that each population of site follows the Langmuir equation was used to analyze the sorption data. Three populations of sites with different affinities for P were detected and the Langmuir constants, k (binding energy term) and b (sorption maximum) were estimated for each population of sites. The median and range for values of k (ml/ug P) and b (ugP/g) for the three populations of site were in decreasing order of affinity for P:K1 = 140, (40-2870) and b1=120 (8-370); K2=2.4, (0.63-10) and b2=174, (25-704); and K3 =0.095, (0.051-0.27) and b3=763 (131-1460). On the average, the total number of P sorption sites (total) was made up of 10% of sites with high affinity for P, 22% with moderate and 68% with low affinity..............................
650 $aFertilidade
650 $aFísica
650 $aQuímica
653 $aSolos
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Amapá; Embrapa Meio Ambiente; Embrapa Recursos Genéticos e Biotecnologia; Embrapa Rondônia. |
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Data corrente: |
28/07/2023 |
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Data da última atualização: |
08/08/2023 |
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Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
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Autoria: |
MARTINS, K.; THOMAS, E.; WADT, L. H. de O.; CORVERA-COMRINGER, R. C.; PAPPAS, M. de C. R.; GUEDES, M. C.; COSTA, P. da. |
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Afiliação: |
KARINA MARTINS, UNIVERSIDADE FEDERAL DE SÃO CARLOS; EVERT THOMAS, BIOVERSITY INTERNATIONAL; LUCIA HELENA DE OLIVEIRA WADT, CPAF-RO; RONALD CORVERA GOMRINGER, INSTITUTO DE INVESTIGACIONES DE LA AMAZONÍA PERUANA; MARILIA DE CASTRO RODRIGUES PAPPAS, Cenargen; MARCELINO CARNEIRO GUEDES, CPAF-AP; PATRICIA DA COSTA, CNPMA. |
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Título: |
Conservação genética e sua importância. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
In: WADT, L. H. de O.; MAROCCOLO, J. F.; GUEDES, M. C.; SILVA, K. E. da (ed.). Castanha-da-amazônia: estudos sobre a espécie e sua cadeia de valor. Brasília, DF: Embrapa, 2023. |
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Páginas: |
cap. 1, p. 17-34. |
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Idioma: |
Português |
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Notas: |
V. 4: Melhoramento genético e cultivo. ODS 2, ODS 3, ODS 8, ODS 11, ODS 12, ODS 13, ODS 17. |
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Conteúdo: |
Este capítulo apresenta o estado da arte do conhecimento sobre diversidade genética e consanguinidade em populações adultas e regenerantes de castanheira-da-amazônia, com o intuito de discutir os riscos potenciais para as populações futuras. |
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Palavras-Chave: |
Castanha da amazônia; Produto florestal não madeireiro (PFNM); Selo ODS 11; Selo ODS 12; Selo ODS 13; Selo ODS 17; Selo ODS 2; Selo ODS 3; Selo ODS 8. |
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Thesagro: |
Agricultura Familiar; Agricultura Sustentável; Bertholletia Excelsa; Cadeia Produtiva; Castanha do Para; Consangüinidade; Conservação; Recurso Genético; Variação Genética. |
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Thesaurus NAL: |
Amazonia; Brazil nuts; Family farms; Genetic variation; Kinship; Nontimber forest products; Supply chain; Sustainable forestry. |
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Categoria do assunto: |
G Melhoramento Genético |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1155429/1/cpafro-18976.pdf
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Marc: |
LEADER 01906naa a2200529 a 4500
001 2155429
005 2023-08-08
008 2023 bl uuuu u00u1 u #d
100 1 $aMARTINS, K.
245 $aConservação genética e sua importância.$h[electronic resource]
260 $c2023
300 $acap. 1, p. 17-34.
500 $aV. 4: Melhoramento genético e cultivo. ODS 2, ODS 3, ODS 8, ODS 11, ODS 12, ODS 13, ODS 17.
520 $aEste capítulo apresenta o estado da arte do conhecimento sobre diversidade genética e consanguinidade em populações adultas e regenerantes de castanheira-da-amazônia, com o intuito de discutir os riscos potenciais para as populações futuras.
650 $aAmazonia
650 $aBrazil nuts
650 $aFamily farms
650 $aGenetic variation
650 $aKinship
650 $aNontimber forest products
650 $aSupply chain
650 $aSustainable forestry
650 $aAgricultura Familiar
650 $aAgricultura Sustentável
650 $aBertholletia Excelsa
650 $aCadeia Produtiva
650 $aCastanha do Para
650 $aConsangüinidade
650 $aConservação
650 $aRecurso Genético
650 $aVariação Genética
653 $aCastanha da amazônia
653 $aProduto florestal não madeireiro (PFNM)
653 $aSelo ODS 11
653 $aSelo ODS 12
653 $aSelo ODS 13
653 $aSelo ODS 17
653 $aSelo ODS 2
653 $aSelo ODS 3
653 $aSelo ODS 8
700 1 $aTHOMAS, E.
700 1 $aWADT, L. H. de O.
700 1 $aCORVERA-COMRINGER, R. C.
700 1 $aPAPPAS, M. de C. R.
700 1 $aGUEDES, M. C.
700 1 $aCOSTA, P. da
773 $tIn: WADT, L. H. de O.; MAROCCOLO, J. F.; GUEDES, M. C.; SILVA, K. E. da (ed.). Castanha-da-amazônia: estudos sobre a espécie e sua cadeia de valor. Brasília, DF: Embrapa, 2023.
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Registro original: |
Embrapa Rondônia (CPAF-RO) |
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