| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Meio-Norte. |
|
Data corrente: |
14/04/2010 |
|
Data da última atualização: |
21/06/2022 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Autoria: |
GALVÃO, S. R. da S.; SALCEDO, I. H. |
|
Afiliação: |
Sandra Regina da Silva Galvão, Embrapa Meio-Norte; Ignacio Hernan Salcedo, Universidade Federal de Pernambuco. |
|
Título: |
Soil phosphorus fractions in sandy soils amended with cattle manure for long periods. |
|
Ano de publicação: |
2009 |
|
Fonte/Imprenta: |
Revista Brasileira de Ciência do Solo, Viçosa, MG, v. 33, n. 3, p. 613-622, maio/jun. 2009. |
|
Idioma: |
Português |
|
Conteúdo: |
Phosphorus fractions were determined in soil samples from areas fertilized or not with farmyard cattle manure (FYM) and in samples of FYM used in the semi-arid region of Paraiba state, Brazil. Soil samples were taken from the 0?20; 20?40 and 40?60 cm layers of 18 cultivated areas, which, according to interviews with farmers, had been treated with 12 to 20 t ha-1 FYM annually, for the past 2 to 40 years. Soil samples were also collected from four unfertilized pasture areas as controls. Phosphorus in the soil samples was sequentially extracted with water (Pw), resin (Pres), NaHCO3 (Pibic and Pobic), NaOH (Pihid and Pohid), H2SO4 (Pacid) and, finally, by digestion with H2SO4/H2O2 (Presd). Nine FYM samples were extracted with water, resin, Mehlich-1, H2SO4, NaOH or digestion with H2SO4/H2O2, not sequentially, and the extracts analyzed for P. The sampled areas had homogeneous, sandy and P-deficient soils; increases in total soil P (Pt) above the mean value of the control areas (up to 274 mg kg-1 in the 0?20 cm layer of the most P-enriched samples) were therefore attributed to FYM applications, which was the only external P input in the region. Regression analysis was used to study the relationship between soil P fractions and Pt. The Pacid fraction, related to Ca-P forms, showed the greatest increases (p < 0.01) as a result of FYM applications, rising from 8.4 mg kg-1 in a non-fertilized sample to 43.8 mg kg-1 in the sample with the highest Pt content. The sum of Pw, Pres and Pibic, considered as labile P, showed comparable increases with Pacid, while Pihid showed the smallest increase due to FYM applications. Organic P forms also increased, more so the fraction Pohid, considered less labile, than the more labile one, Pobic. The residual P fraction was practically half of Pt, independently of the Pt value. Increases in labile P, Pacid and organic P were justified by the high average concentration of Pw (36 %), Pacid (34 %), and Pohid (30 %) in the FYM. Significant changes in the proportion of P forms among soil layers indicated the downward movement of P in organic forms. MenosPhosphorus fractions were determined in soil samples from areas fertilized or not with farmyard cattle manure (FYM) and in samples of FYM used in the semi-arid region of Paraiba state, Brazil. Soil samples were taken from the 0?20; 20?40 and 40?60 cm layers of 18 cultivated areas, which, according to interviews with farmers, had been treated with 12 to 20 t ha-1 FYM annually, for the past 2 to 40 years. Soil samples were also collected from four unfertilized pasture areas as controls. Phosphorus in the soil samples was sequentially extracted with water (Pw), resin (Pres), NaHCO3 (Pibic and Pobic), NaOH (Pihid and Pohid), H2SO4 (Pacid) and, finally, by digestion with H2SO4/H2O2 (Presd). Nine FYM samples were extracted with water, resin, Mehlich-1, H2SO4, NaOH or digestion with H2SO4/H2O2, not sequentially, and the extracts analyzed for P. The sampled areas had homogeneous, sandy and P-deficient soils; increases in total soil P (Pt) above the mean value of the control areas (up to 274 mg kg-1 in the 0?20 cm layer of the most P-enriched samples) were therefore attributed to FYM applications, which was the only external P input in the region. Regression analysis was used to study the relationship between soil P fractions and Pt. The Pacid fraction, related to Ca-P forms, showed the greatest increases (p < 0.01) as a result of FYM applications, rising from 8.4 mg kg-1 in a non-fertilized sample to 43.8 mg kg-1 in the sample with the highest Pt content. The sum of Pw, Pres and Pib... Mostrar Tudo |
|
Palavras-Chave: |
Organic phosphorus; Phosphorus leaching; Water soluble phosphorus. |
|
Categoria do assunto: |
-- |
|
URL: |
https://www.scielo.br/pdf/rbcs/v33n3/v33n3a14.pdf
|
|
Marc: |
LEADER 02657naa a2200169 a 4500
001 1664276
005 2022-06-21
008 2009 bl uuuu u00u1 u #d
100 1 $aGALVÃO, S. R. da S.
245 $aSoil phosphorus fractions in sandy soils amended with cattle manure for long periods.
260 $c2009
520 $aPhosphorus fractions were determined in soil samples from areas fertilized or not with farmyard cattle manure (FYM) and in samples of FYM used in the semi-arid region of Paraiba state, Brazil. Soil samples were taken from the 0?20; 20?40 and 40?60 cm layers of 18 cultivated areas, which, according to interviews with farmers, had been treated with 12 to 20 t ha-1 FYM annually, for the past 2 to 40 years. Soil samples were also collected from four unfertilized pasture areas as controls. Phosphorus in the soil samples was sequentially extracted with water (Pw), resin (Pres), NaHCO3 (Pibic and Pobic), NaOH (Pihid and Pohid), H2SO4 (Pacid) and, finally, by digestion with H2SO4/H2O2 (Presd). Nine FYM samples were extracted with water, resin, Mehlich-1, H2SO4, NaOH or digestion with H2SO4/H2O2, not sequentially, and the extracts analyzed for P. The sampled areas had homogeneous, sandy and P-deficient soils; increases in total soil P (Pt) above the mean value of the control areas (up to 274 mg kg-1 in the 0?20 cm layer of the most P-enriched samples) were therefore attributed to FYM applications, which was the only external P input in the region. Regression analysis was used to study the relationship between soil P fractions and Pt. The Pacid fraction, related to Ca-P forms, showed the greatest increases (p < 0.01) as a result of FYM applications, rising from 8.4 mg kg-1 in a non-fertilized sample to 43.8 mg kg-1 in the sample with the highest Pt content. The sum of Pw, Pres and Pibic, considered as labile P, showed comparable increases with Pacid, while Pihid showed the smallest increase due to FYM applications. Organic P forms also increased, more so the fraction Pohid, considered less labile, than the more labile one, Pobic. The residual P fraction was practically half of Pt, independently of the Pt value. Increases in labile P, Pacid and organic P were justified by the high average concentration of Pw (36 %), Pacid (34 %), and Pohid (30 %) in the FYM. Significant changes in the proportion of P forms among soil layers indicated the downward movement of P in organic forms.
653 $aOrganic phosphorus
653 $aPhosphorus leaching
653 $aWater soluble phosphorus
700 1 $aSALCEDO, I. H.
773 $tRevista Brasileira de Ciência do Solo, Viçosa, MG$gv. 33, n. 3, p. 613-622, maio/jun. 2009.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Meio-Norte (CPAMN) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
Registro Completo
|
Biblioteca(s): |
Embrapa Acre. |
|
Data corrente: |
17/10/2003 |
|
Data da última atualização: |
22/05/2023 |
|
Autoria: |
FIGUEIREDO, E. O. |
|
Afiliação: |
EVANDRO ORFANO FIGUEIREDO, CPAF-Acre. |
|
Título: |
Recomendações para a poda em reflorestamentos de Sumaúma (Ceiba pentandra (L) Gaertn). |
|
Ano de publicação: |
2001 |
|
Fonte/Imprenta: |
Rio Branco, AC: Embrapa Acre, 2001. |
|
Páginas: |
2 p. |
|
Série: |
(Embrapa Acre. Instruções técnicas, 36). |
|
ISSN: |
0104-9038 |
|
Idioma: |
Português |
|
Conteúdo: |
Este estudo compara três diferentes procedimentos de condução da desrama em reflorestamento de sumaúma. |
|
Palavras-Chave: |
Mafumeira; Reforestación; Samaúma. |
|
Thesagro: |
Ceiba Pentandra; Paineira; Poda; Reflorestamento; Silvicultura. |
|
Thesaurus NAL: |
Kapok; Pruning; Reforestation; Silviculture. |
|
Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CPAF-AC/4496/1/it36.pdf
|
|
Marc: |
LEADER 00893nam a2200289 a 4500
001 1495887
005 2023-05-22
008 2001 bl uuuu u0uu1 u #d
022 $a0104-9038
100 1 $aFIGUEIREDO, E. O.
245 $aRecomendações para a poda em reflorestamentos de Sumaúma (Ceiba pentandra (L) Gaertn).$h[electronic resource]
260 $aRio Branco, AC: Embrapa Acre$c2001
300 $a2 p.
490 $a(Embrapa Acre. Instruções técnicas, 36).
520 $aEste estudo compara três diferentes procedimentos de condução da desrama em reflorestamento de sumaúma.
650 $aKapok
650 $aPruning
650 $aReforestation
650 $aSilviculture
650 $aCeiba Pentandra
650 $aPaineira
650 $aPoda
650 $aReflorestamento
650 $aSilvicultura
653 $aMafumeira
653 $aReforestación
653 $aSamaúma
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Acre (CPAF-AC) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
