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| Registros recuperados : 14 | |
| 1. |  | MOLLER, R.; SÁ, T.; HÖLSCHER, D. Nutrient dynamics in fallow vegetation: an overview of the results from ENV-25. In: GERMAN-BRAZILIAN ON WORKSHOP ON NEOTROPICAL ECOSYSTEMS - ACHIEVEMENTS AND PROSPECTS OF COOPERATIVE RESEARCH, 2000, Hamburg. Proceedings. Geesthacht: GKSS, 2002. p. 252. Editado por Reinhard Lieberei, Helmut Bianchi, Vera Boehm, Christoph Reisdorff. Anexo 1 CD-ROM nº 0084, completo. Publicado também em GERMAN-BRAZILIAN WORKSHOP ON NEOTROPICAL ECOSYSTEMS: ARCHIEMENTS AND PROPECTS OF COOPERATIVE RESEARCH,...| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 8. | | SÁ, T. D. de A.; MOLLER, M. R. F.; HOLSCHER, D.; SOMMER, R. Rainfall partitioning in natural and enriched secondary vegetation under fallow in eastern Amazonia: a quantitative overview. In: GERMAN-BRAZILIAN WORKSHOP ON NEOTROPICAL ECOSYSTEMS - ARCHIEVEMENTS AND PROSPECTS OF COOPERATIVE RESEARCH, 2000, Hamburg. Proceedings. Geesthacht: GKSS, 2002. p. 311-312. Editado por Reinhard Lieberei, Helmut Bianchi, Vera Boehm, Christoph Reisdorff. Anexo 1 CD-ROM nº 0084, completo.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 10. | | SÁ, T. D. A.; HÖLSCHER, D.; ALMEIDA, E.; BASTOS, T. X. Spatial and temporal variability of rainfall partitioning, following two secondary vegetations in Northeastern Pará, Brazil. In: SHIFT-WORKSHOP, 2., 1995, Cuiabá. Summaries of lectures and posters... Cuiabá: UFMT, 1995. p. 219.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 12. | | SÁ, T. D. de A.; ARAUJO, A. C. de; MÖLLER, M. R. F.; HOLSCHER, D.; BASTOS, T. X. Chuva sob dossel ao longo de sucessões vegetais: capoeiras do nordeste do Pará. In: CONGRESSO BRASILEIRO DE AGROMETEOROLOGIA, 11.; REUNIÃO LATINO AMERICANA DE AGROMETEOROLOGIA, 2., 1999, Florianópolis. Programa e resumo de anais. Florianópolis: Sociedade Brasileira de Agrometeorologia, 1999. p. 506. CD-ROM.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 13. | | MOLLER, M. R. F.; SÁ, T. D. de A.; ARAUJO, A. C. de; BASTOS, T. X.; SOMMER, R.; HOLSCHER, D.; BRIENZA JUNIOR, S.; VIELHAUER, K. Qualitative and quantitative patterns of variation in throughfall in spontaneous and enriched secondary vegetation under fallow in Northeastern Para State Brazil. In: SHIFT-WORKSHOP, 3., 1998, Manaus. Program, abstracts of presentation and posters. [S.l.]: SHIFT, 1998. A15.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 14. | | SÁ, T. D. de A.; WICKEL, A. J.; CARVALHO, C. J. R. de; HÖLSCHER, D.; VILHAUER, K.; DENICH, M.; KATO, M. do S. A.; KATO, O. R.; TIPPMANN, R.; SOMMER, R.; BRIENZA JUNIOR, S. Sistemas agroflorestais seqüenciais centrados no manejo de capoeiras- possibilidades de promover o uso sustentável da terra no âmbito da agricultura familiar amazônica. In: CONGRESSO BRASILEIRO DE SISTEMAS AGROFLORESTAIS, 4., 2002, Ilhéus. Resumos expandidos. IIhéus: CEPLAC-CEPEC, 2002.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| Registros recuperados : 14 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
|
Data corrente: |
02/12/1999 |
|
Data da última atualização: |
06/12/2022 |
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Autoria: |
HÖLSCHER, D.; LUDWIG, B.; MÖLLER, R. F.; FÖLSTER, H. |
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Afiliação: |
Institute of Soil Science and Forest Nutrition, University of Göttingen; Institute of Soil Science and Forest Nutrition, University of Göttingen; MARIA REGINA FREIRE MÖLLER, CPATU; Institute of Soil Science and Forest Nutrition, University of Göttingen. |
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Título: |
Dynamic of soil chemical parameters in shifting agriculture in the Eastern Amazon. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Agriculture, Ecosystems and Environment, v. 66, n. 2, p. 153-163, Dec. 1997. |
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Idioma: |
Inglês |
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Conteúdo: |
In Northeast Pará, Brazil, shifting agriculture by land settlers has been practiced for around 100 years. After a common cropping period of 2 years the fields are left fallow for 4 to 8 years. Changes in extractable cations and C, N, and P of soils were studied on six fields which were under different phases of the rotational cycle. The chemical composition of soil solutions was also monitored for a period of 19 months. In topsoils, the differences in C and N contents and extractable Ca and Al could be related to the landuse history expressed as time elapsed since last burn. Repeated sampling on two ?slash and burn? plots, showed significant increases in pH, CEC, extractable K, Ca and Mg, but decreases in extractable Na and Al, C and N content in the plots from 7-year old fallow to the first-year cropping field. Soil solution chemistry at 105 cm depth did not change with increasing fallow age. On the ?slash and burn? field, big variations in solute composition at 10 cm depth were observed during the initial months of the cropping period. In the soil solutions after burning, Ca concentrations ranged from 4.8 to 30.1 mg l?1, but decreased to values between 1.2 and 2.7 mg l?1 within 2 months. Slash burning and subsequent cropping lead to increases of Cl? and NO?3 in the soil solution at 105 cm depth. A small dose of NPK fertilizer (11 kg N ha?1, 13 kg P ha?1 and 17 kg K ha?1) did not increase NO?3 concentration and chloride concentrations at this depth increased to a small extent. After the harvest of cassava, high nitrate concentrations of 11 mg N l?1 were observed. NO?3 and Cl? concentrations on the cropping fields were significantly correlated (n = 350) with the sum of the concentration of the Mb cations (Na, K, Ca, Mg), (NO?3?Mb, r = 0.82; Cl??Mb, r = 0.81). Nitrate also showed significant correlations with protons (r = 0.59) and Al (r = 0.47) concentrations. Ion concentrations in the soil solution can be reduced by agricultural management. During harvest, the aboveground vegetation should not be removed completely in one single step. If clear cutting cannot be avoided, the timing should be chosen as to keep some vegetation with high uptake potential at the beginning of the rainy season. A small dose of NPK-fertilizer stimulated the nutrient uptake by the vegetation and did not enhance nutrient concentrations in the seepage water. MenosIn Northeast Pará, Brazil, shifting agriculture by land settlers has been practiced for around 100 years. After a common cropping period of 2 years the fields are left fallow for 4 to 8 years. Changes in extractable cations and C, N, and P of soils were studied on six fields which were under different phases of the rotational cycle. The chemical composition of soil solutions was also monitored for a period of 19 months. In topsoils, the differences in C and N contents and extractable Ca and Al could be related to the landuse history expressed as time elapsed since last burn. Repeated sampling on two ?slash and burn? plots, showed significant increases in pH, CEC, extractable K, Ca and Mg, but decreases in extractable Na and Al, C and N content in the plots from 7-year old fallow to the first-year cropping field. Soil solution chemistry at 105 cm depth did not change with increasing fallow age. On the ?slash and burn? field, big variations in solute composition at 10 cm depth were observed during the initial months of the cropping period. In the soil solutions after burning, Ca concentrations ranged from 4.8 to 30.1 mg l?1, but decreased to values between 1.2 and 2.7 mg l?1 within 2 months. Slash burning and subsequent cropping lead to increases of Cl? and NO?3 in the soil solution at 105 cm depth. A small dose of NPK fertilizer (11 kg N ha?1, 13 kg P ha?1 and 17 kg K ha?1) did not increase NO?3 concentration and chloride concentrations at this depth increased to a small exte... Mostrar Tudo |
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Palavras-Chave: |
Brasil; Igarapé-Açu; Pará. |
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Thesagro: |
Cultivo Migratório; Mecânica do Solo; Química do Solo. |
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Thesaurus NAL: |
Amazonia; shifting cultivation; soil chemistry; soil mechanics. |
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Categoria do assunto: |
-- |
|
Marc: |
LEADER 03168naa a2200277 a 4500
001 1399998
005 2022-12-06
008 1997 bl uuuu u00u1 u #d
100 1 $aHÖLSCHER, D.
245 $aDynamic of soil chemical parameters in shifting agriculture in the Eastern Amazon.$h[electronic resource]
260 $c1997
520 $aIn Northeast Pará, Brazil, shifting agriculture by land settlers has been practiced for around 100 years. After a common cropping period of 2 years the fields are left fallow for 4 to 8 years. Changes in extractable cations and C, N, and P of soils were studied on six fields which were under different phases of the rotational cycle. The chemical composition of soil solutions was also monitored for a period of 19 months. In topsoils, the differences in C and N contents and extractable Ca and Al could be related to the landuse history expressed as time elapsed since last burn. Repeated sampling on two ?slash and burn? plots, showed significant increases in pH, CEC, extractable K, Ca and Mg, but decreases in extractable Na and Al, C and N content in the plots from 7-year old fallow to the first-year cropping field. Soil solution chemistry at 105 cm depth did not change with increasing fallow age. On the ?slash and burn? field, big variations in solute composition at 10 cm depth were observed during the initial months of the cropping period. In the soil solutions after burning, Ca concentrations ranged from 4.8 to 30.1 mg l?1, but decreased to values between 1.2 and 2.7 mg l?1 within 2 months. Slash burning and subsequent cropping lead to increases of Cl? and NO?3 in the soil solution at 105 cm depth. A small dose of NPK fertilizer (11 kg N ha?1, 13 kg P ha?1 and 17 kg K ha?1) did not increase NO?3 concentration and chloride concentrations at this depth increased to a small extent. After the harvest of cassava, high nitrate concentrations of 11 mg N l?1 were observed. NO?3 and Cl? concentrations on the cropping fields were significantly correlated (n = 350) with the sum of the concentration of the Mb cations (Na, K, Ca, Mg), (NO?3?Mb, r = 0.82; Cl??Mb, r = 0.81). Nitrate also showed significant correlations with protons (r = 0.59) and Al (r = 0.47) concentrations. Ion concentrations in the soil solution can be reduced by agricultural management. During harvest, the aboveground vegetation should not be removed completely in one single step. If clear cutting cannot be avoided, the timing should be chosen as to keep some vegetation with high uptake potential at the beginning of the rainy season. A small dose of NPK-fertilizer stimulated the nutrient uptake by the vegetation and did not enhance nutrient concentrations in the seepage water.
650 $aAmazonia
650 $ashifting cultivation
650 $asoil chemistry
650 $asoil mechanics
650 $aCultivo Migratório
650 $aMecânica do Solo
650 $aQuímica do Solo
653 $aBrasil
653 $aIgarapé-Açu
653 $aPará
700 1 $aLUDWIG, B.
700 1 $aMÖLLER, R. F.
700 1 $aFÖLSTER, H.
773 $tAgriculture, Ecosystems and Environment$gv. 66, n. 2, p. 153-163, Dec. 1997.
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