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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
09/08/2004 |
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Data da última atualização: |
09/08/2004 |
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Autoria: |
OLIVEIRA, O. C. de; OLIVEIRA, I. P. de; ALVES, B. J. R.; URQUIAGA, S.; BODDEY, R. M. |
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Título: |
Chemical and biological indicators of decline/degradation of Brachiaria pastures in the Brazilian cerrado. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Agriculture Ecosystems & Environment, Amsterdam, v. 103, p. 289-300, 2004. |
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Idioma: |
Inglês |
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Conteúdo: |
Some years after their installation, areas of planted to Brachiaria and other African grasses in the Brazilian savanna ("Cerrado") region show a continuous decline in forage and productivity. If no remedial measures are taken, plant cover decreases, the areas become invaded by weeds and the soil becomes compacted. In Brazil these pastures are described as degraded ("degradada") and this phenomenon has become the major limiting factor to extensive beef production. However, this process is not yet well understood. A series of evaluations were implemented in representative beef production areas in the Cerrado region in order to determine which chemical and biological parameters could best be used as indicators of degradation. Choronosequences of Brachiaria brizantha and Brachiaria decumbens pastures were used in this study. In degraded pastures the lowest quantities of plant litter and organic matter light fraction were observed, which are important pools in nutrient cycling. Soil microbial biomass carbon decreased as pastures age increased. Soil fertility and plant tissue analyses, and potentially mineralisable nitrogen were not suitable indicators of degradation. Physical fractionation by flotation of soil organic matter (SOM) macro-aggregates (>150 mm) differentiated very clearly more recently reformed B. brizantha pastures from a 20-year-old degraded B. decumbens pastures but this technique a lot of time and effort and did not show any very significant changes with age of the reformed pastures. The results of this suggest that the most reliable and simple indicator of pasture decline was found to be the rate of litter deposition, followed by microbial biomass C and pasture regrowth after cutting. MenosSome years after their installation, areas of planted to Brachiaria and other African grasses in the Brazilian savanna ("Cerrado") region show a continuous decline in forage and productivity. If no remedial measures are taken, plant cover decreases, the areas become invaded by weeds and the soil becomes compacted. In Brazil these pastures are described as degraded ("degradada") and this phenomenon has become the major limiting factor to extensive beef production. However, this process is not yet well understood. A series of evaluations were implemented in representative beef production areas in the Cerrado region in order to determine which chemical and biological parameters could best be used as indicators of degradation. Choronosequences of Brachiaria brizantha and Brachiaria decumbens pastures were used in this study. In degraded pastures the lowest quantities of plant litter and organic matter light fraction were observed, which are important pools in nutrient cycling. Soil microbial biomass carbon decreased as pastures age increased. Soil fertility and plant tissue analyses, and potentially mineralisable nitrogen were not suitable indicators of degradation. Physical fractionation by flotation of soil organic matter (SOM) macro-aggregates (>150 mm) differentiated very clearly more recently reformed B. brizantha pastures from a 20-year-old degraded B. decumbens pastures but this technique a lot of time and effort and did not show any very significant changes with age of t... Mostrar Tudo |
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Palavras-Chave: |
Brachiaria grass. |
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Thesagro: |
Brachiaria; Capim Brachiaria; Cerrado; Pastagem; Vegetação. |
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Thesaurus Nal: |
pastures; savannas; vegetation. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02510naa a2200277 a 4500
001 1626284
005 2004-08-09
008 2004 bl --- 0-- u #d
100 1 $aOLIVEIRA, O. C. de
245 $aChemical and biological indicators of decline/degradation of Brachiaria pastures in the Brazilian cerrado.
260 $c2004
520 $aSome years after their installation, areas of planted to Brachiaria and other African grasses in the Brazilian savanna ("Cerrado") region show a continuous decline in forage and productivity. If no remedial measures are taken, plant cover decreases, the areas become invaded by weeds and the soil becomes compacted. In Brazil these pastures are described as degraded ("degradada") and this phenomenon has become the major limiting factor to extensive beef production. However, this process is not yet well understood. A series of evaluations were implemented in representative beef production areas in the Cerrado region in order to determine which chemical and biological parameters could best be used as indicators of degradation. Choronosequences of Brachiaria brizantha and Brachiaria decumbens pastures were used in this study. In degraded pastures the lowest quantities of plant litter and organic matter light fraction were observed, which are important pools in nutrient cycling. Soil microbial biomass carbon decreased as pastures age increased. Soil fertility and plant tissue analyses, and potentially mineralisable nitrogen were not suitable indicators of degradation. Physical fractionation by flotation of soil organic matter (SOM) macro-aggregates (>150 mm) differentiated very clearly more recently reformed B. brizantha pastures from a 20-year-old degraded B. decumbens pastures but this technique a lot of time and effort and did not show any very significant changes with age of the reformed pastures. The results of this suggest that the most reliable and simple indicator of pasture decline was found to be the rate of litter deposition, followed by microbial biomass C and pasture regrowth after cutting.
650 $apastures
650 $asavannas
650 $avegetation
650 $aBrachiaria
650 $aCapim Brachiaria
650 $aCerrado
650 $aPastagem
650 $aVegetação
653 $aBrachiaria grass
700 1 $aOLIVEIRA, I. P. de
700 1 $aALVES, B. J. R.
700 1 $aURQUIAGA, S.
700 1 $aBODDEY, R. M.
773 $tAgriculture Ecosystems & Environment, Amsterdam$gv. 103, p. 289-300, 2004.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Corte. Para informações adicionais entre em contato com cnpgc.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
11/11/2011 |
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Data da última atualização: |
11/11/2011 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
BARROS, J. C.; FIGUEIREDO-NETO, L. F.; ANDREOTTI, R. |
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Afiliação: |
JACQUELINE CAVALCANTE BARROS, CNPGC; LEONARDO F. FIGUEIREDO-NETO, UFMS; RENATO ANDREOTTI E SILVA, CNPGC. |
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Título: |
Neosporosis economic impact on productive system of beef cattle in the Mato Grosso do Sul State, Brazil. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
In: AMERICAN ASSOCIATION OF VETERINARY PARASITOLOGISTS ANNUAL MEETING, 56.; LIVESTOCK INSECT WORKERS CONFERENCE, 55.; INTERNATIONAL SYMPOSIUM ON ECTOPARASITES OF PETS, 11.,2011,ST. LOUIS, MO. Sustainable parasite and vector control: proceedings. St. Louis,MO: American Association of Veterinary Parasitologists, 2011. |
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Páginas: |
p.78 |
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Idioma: |
Inglês |
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Notas: |
Session 11-Cattle protozoa. n. 73. |
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Conteúdo: |
This paper was prepared aiming to evaluate the economic impact of the neosporosis occurrence on productive sector of beef cattle in Mato Grosso do Sul State. |
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Palavras-Chave: |
Bovino de corte; Impacto; Mato Grosos do Sul. |
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Thesagro: |
Neosporose; Sanidade Animal; Sistema de Produção. |
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Categoria do assunto: |
H Saúde e Patologia |
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Marc: |
LEADER 01131naa a2200241 a 4500
001 1905800
005 2011-11-11
008 2011 bl uuuu u00u1 u #d
100 1 $aBARROS, J. C.
245 $aNeosporosis economic impact on productive system of beef cattle in the Mato Grosso do Sul State, Brazil.
260 $c2011
300 $ap.78
500 $aSession 11-Cattle protozoa. n. 73.
520 $aThis paper was prepared aiming to evaluate the economic impact of the neosporosis occurrence on productive sector of beef cattle in Mato Grosso do Sul State.
650 $aNeosporose
650 $aSanidade Animal
650 $aSistema de Produção
653 $aBovino de corte
653 $aImpacto
653 $aMato Grosos do Sul
700 1 $aFIGUEIREDO-NETO, L. F.
700 1 $aANDREOTTI, R.
773 $tIn: AMERICAN ASSOCIATION OF VETERINARY PARASITOLOGISTS ANNUAL MEETING, 56.; LIVESTOCK INSECT WORKERS CONFERENCE, 55.; INTERNATIONAL SYMPOSIUM ON ECTOPARASITES OF PETS, 11.,2011,ST. LOUIS, MO. Sustainable parasite and vector control: proceedings. St. Louis,MO: American Association of Veterinary Parasitologists, 2011.
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