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Registro Completo |
Biblioteca(s): |
Embrapa Agrobiologia. |
Data corrente: |
09/08/2004 |
Data da última atualização: |
09/08/2004 |
Autoria: |
OLIVEIRA, O. C. de; OLIVEIRA, I. P. de; ALVES, B. J. R.; URQUIAGA, S.; BODDEY, R. M. |
Título: |
Chemical and biological indicators of decline/degradation of Brachiaria pastures in the Brazilian cerrado. |
Ano de publicação: |
2004 |
Fonte/Imprenta: |
Agriculture Ecosystems & Environment, Amsterdam, v. 103, p. 289-300, 2004. |
Idioma: |
Inglês |
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 |
Palavras-Chave: |
Brachiaria grass. |
Thesagro: |
Brachiaria; Capim Brachiaria; Cerrado; Pastagem; Vegetação. |
Thesaurus Nal: |
pastures; savannas; vegetation. |
Categoria do assunto: |
-- |
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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Registros recuperados : 243 | |
142. | | SILVA, J. G. da; KLUTHCOUSKI, J.; STONE, L. F.; AIDAR, H.; OLIVEIRA, I. P. de; FERREIRA, E. Desempenho de semeadoras-adubadoras no estabelecimento da cultura do arroz de sequeiro. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 33, n. 1, p. 63-70, jan. 1998.Tipo: Artigo em Periódico Indexado |
Biblioteca(s): Embrapa Arroz e Feijão; Embrapa Unidades Centrais. |
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144. | | COSTA, K. A. de P.; FAQUIN, V.; OLIVEIRA, I. P. de; SEVERIANO, E. da C.; OLIVEIRA, M. A. de. Doses e fontes de nitrogênio na nutrição mineral do capim-marandu. Ciência Animal Brasileira, Goiânia, v. 10, n. 1, p. 115-123, jan./mar. 2009.Biblioteca(s): Embrapa Arroz e Feijão. |
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145. | | COSTA, K. A. de P.; FAQUIN, V.; OLIVEIRA, I. P. de; RODRIGUES, C.; SEVERIANO, E. da C. Doses e fontes de nitrogênio em pastagem de capim-marandu. I. alterações nas características químicas do solo. Revista Brasileira de Ciência do Solo, Viçosa, MG, v. 32, n. 4, p. 1591-1599, jul./ago. 2008.Biblioteca(s): Embrapa Arroz e Feijão. |
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146. | | COSTA, K. A. de P.; FAQUIN, V.; OLIVEIRA, I. P. de; ARAÚJO, J. L.; RODRIGUES, R. B. Doses e fontes de nitrogênio em pastagem de capim-marandu. II. nutrição nitrogenada da planta. Revista Brasileira de Ciência do Solo, Viçosa, MG, v. 32, n. 4, p. 1601-1607, jul./ago. 2008.Biblioteca(s): Embrapa Arroz e Feijão. |
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147. | | OLIVEIRA, I. P. de; BATISTA, I.; MENEZES, C. E. G.; PEREIRA, M. G.; CORREIA, M. E. F. Avaliação sazonal da macrofauna edáfica sob fragmentos florestais em diferentes estádios sucessionais e pasto misto manejado no bioma Mata Atlântica-RJ. In: JORNADA DE INICIAÇÃO CIENTÍFICA DA UNIVERSIDADE FEDERAL RURAL DO RIO DE JANEIRO, 18., 2008, Seropédica, RJ. Seropédica, RJ, 2008. Parceria: UFRRJTipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Agrobiologia. |
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149. | | YOKOYAMA, L. P.; VIANA FILHO, A.; BALBINO, L. C.; OLIVEIRA, I. P. de; BARCELLOS, A. de O. Técnicas de renovação/recuperação de pastagens em consórcio com culturas anuais - avaliação econômica. In: REUNIÃO NACIONAL DE PESQUISA DE ARROZ, 6., 1998, Goiânia. Perspectivas para a cultura dos arroz nos ecossistemas de várzeas e terras altas: resumos expandidos. Goiânia: Embrapa-CNPAF, 1998. v. 1. p. 492-495. (Embrapa-CNPAF. Documentos, 85).Tipo: Artigo em Anais de Congresso |
Biblioteca(s): Embrapa Arroz e Feijão. |
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151. | | OLIVEIRA, I. P. de; OLIVEIRA, R. M. de; AIDAR, H.; KLUTHCOUSKI, J.; THUNG, M.; FARIA, C. D. de. Variações no pH do solo e produtividade do feijão-comum, em plantio direto irrigado, sobre várias coberturas mortas. In: CONGRESSO NACIONAL DE PESQUISA DE FEIJÃO, 7., 2002, Viçosa, MG. Resumos expandidos. Viçosa: UFV; DFT, 2002. p. 712-714.Biblioteca(s): Embrapa Arroz e Feijão. |
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152. | | THUNG, M.; AIDAR, H.; OLIVEIRA, I. P. de; KLUTHCOUSKI, J.; CABRERA, J. L. D.; CARNEIRO, G. E. S. Evaluation of large seeded bean in Brazil. Annual Report of the Bean Improvement Cooperative, East Lansing, v. 43, p. 140-141, Mar. 2000.Tipo: Artigo em Periódico Indexado | Circulação/Nível: Nacional - B |
Biblioteca(s): Embrapa Arroz e Feijão. |
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154. | | COSTA, K. A. de P.; ARAUJO, J. L.; FAQUIN, V.; OLIVEIRA, I. P. de; FIGUEIREDO, F. C.; GOMES, K. W. Extração de macronutrientes pela fitomassa do capim-xaraés "xaraés" em função de doses de nitrogênio e potássio. Ciência Rural, v. 38, n. 4, p. 1162-1166, jul. 2008.Tipo: Artigo em Periódico Indexado |
Biblioteca(s): Embrapa Arroz e Feijão. |
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156. | | KLUTHCOUSKI, J.; OLIVEIRA, I. P. de; THUNG, M.; AIDAR, H.; SANTOS, R. S. M.; SILVA, J. G. da; COBUCCI, T. Effect of different land preparations on soil microorganism population and seed treatments with fungicides on bean production in No till farming. Annual Report of the Bean Improvement Cooperative, East Lansing, v. 43, p. 148-149, Mar. 2000.Tipo: Artigo em Periódico Indexado | Circulação/Nível: Nacional - B |
Biblioteca(s): Embrapa Arroz e Feijão. |
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157. | | ARAÚJO, J. P. P. de; WATT, E. E.; OLIVEIRA, I. P. de; CHAGAS, J. M.; VIEIRA, R. F. Influência da incorporação de adubo verde e da aplicação de fósforo na produção e qualidade do grão de caupi. In: REUNIÃO NACIONAL DE PESQUISA DE CAUPI, 1., 1982, Goiânia. Resumos...Goiânia: EMBRAPA-CNPAF, 1982. p. 266-268. (EMBRAPA-CNPAF. Documentos, 4).Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Arroz e Feijão. |
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Registros recuperados : 243 | |
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