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12. | | MORAES, A. S.; GREGO, C. R.; FASIABEN, M. do C. R.; OLIVEIRA, O. C. de. Evolução da cultura da soja na agropecuária brasileira segundo os censos agropecuários 2006 e 2017. In: CONGRESSO DA SOCIEDADE BRASILEIRA DE ECONOMIA, ADMINISTRAÇÃO E SOCIOLOGIA RURAL, 61., 2023, Piracicaba. Agropecuária do futuro: tecnologia, sustentabilidade e a segurança alimentar: anais. Piracicaba: ESALQ/USP, 2023. 20 p. SOBER 2023. GT07. Biblioteca(s): Embrapa Agricultura Digital; Embrapa Soja. |
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19. | | URQUIAGA, S.; RESENDE, A. S. de; QUEIROZ, J. G.; ALVES, B. J. R.; OLIVEIRA, O. C. de; BODDEY, R. M. Efeito residual, a longo prazo, da queima, aplicações de vinhaça e adubo nitrogenado no rendimento da cana-de-açucar. IN: CONGRESSO BRASILEIRO DE CIÊNÇIA DO SOLO, 25., 1995, Viçosa, MG. Resumos expandidos. Viçosa: UFV, 1995. v.2, p. 767-769. Biblioteca(s): Embrapa Tabuleiros Costeiros. |
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Registros recuperados : 61 | |
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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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