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Registro Completo |
Biblioteca(s): |
Embrapa Agrobiologia. |
Data corrente: |
29/12/1999 |
Data da última atualização: |
31/05/2007 |
Autoria: |
CANTARUTTI, R. B.; TARRE, R.; MACEDO, R.; CADISCH, G.; REZENDE, C. de P.; PEREIRA, J. M.; BRAGA, J. M.; GOMIDE, J. A.; FERREIRA, E.; ALVES, B. J. R.; URQUIAGA, S.; BODDEY, R. M. |
Título: |
The effect of grazing intensity and the presence of a forage legume on nitrogen dynamics in Brachiaria pastures in the Atlantic forest region of the South of Bahia, Brazil. |
Ano de publicação: |
2002 |
Fonte/Imprenta: |
Nutrient Cycling in Agroecossytems, Netherlands, v. 64, p. 257-271, 2002. |
Idioma: |
Inglês |
Conteúdo: |
It has been shown that with careful grazing management and addition of p and K. but not N. fertilisers Brachiaria pastures are able to maintain sustainable live weight gains over many years. However. standard on-farm practice. which generally involves high stocking rates. leads after a few years to pasture decline due mainly to N deficiency for grass regrowth. To generate an understanding of the mechanism of pasture decline and possible management options to mitigate this process. a study was performed in the Atlantic forest region of the south of Bahia state to study the N dynamics in pastures of Brachiaria humidicola subject to three different stocking rates of beef cattle. with and without the presence of the forage legume Desmodium ovalifolium. Despite the fact that the C:N ratio of the deposited litter was high (60 to 70) the rate of decomposition was very rapid (k --0.07 9 g-l day-1) and annual rates of N turnover through the litter pathway were between 105 and 170 kg N ha-1 year-1. In the grass-only pastures as stocking rate increased from 2 to 3 head ha -1. N recycled in the litter decreased by 11 %. but a further increase to 4 head ha-1 decreased N recycling by 30% suggesting that beyond a certain critical level higher grazing stocking rates would lead to pasture decline if there was no N addition. High stocking rates decreased the proportion of the legume in the sward. but at all rates the concentration of N in both the green and dead grass in the forage on offer and in the litter was higher in the mixed sward. The presence of the legume caused a decrease in the C:N ratio of the microbial biomass while both soil N minera1isation and nitrification increased. This increased rate of turnover of the microbia1 biomass and the contribution of N2 fixation to the legume resulted in large increases in the N recycled via litter deposition ranging from 42 to 155 kg N ha-1 year-1. MenosIt has been shown that with careful grazing management and addition of p and K. but not N. fertilisers Brachiaria pastures are able to maintain sustainable live weight gains over many years. However. standard on-farm practice. which generally involves high stocking rates. leads after a few years to pasture decline due mainly to N deficiency for grass regrowth. To generate an understanding of the mechanism of pasture decline and possible management options to mitigate this process. a study was performed in the Atlantic forest region of the south of Bahia state to study the N dynamics in pastures of Brachiaria humidicola subject to three different stocking rates of beef cattle. with and without the presence of the forage legume Desmodium ovalifolium. Despite the fact that the C:N ratio of the deposited litter was high (60 to 70) the rate of decomposition was very rapid (k --0.07 9 g-l day-1) and annual rates of N turnover through the litter pathway were between 105 and 170 kg N ha-1 year-1. In the grass-only pastures as stocking rate increased from 2 to 3 head ha -1. N recycled in the litter decreased by 11 %. but a further increase to 4 head ha-1 decreased N recycling by 30% suggesting that beyond a certain critical level higher grazing stocking rates would lead to pasture decline if there was no N addition. High stocking rates decreased the proportion of the legume in the sward. but at all rates the concentration of N in both the green and dead grass in the forage on offer a... Mostrar Tudo |
Thesagro: |
Brachiaria; Leguminosa Forrageira. |
Thesaurus Nal: |
forage legumes. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02805naa a2200289 a 4500 001 1624177 005 2007-05-31 008 2002 bl --- 0-- u #d 100 1 $aCANTARUTTI, R. B. 245 $aThe effect of grazing intensity and the presence of a forage legume on nitrogen dynamics in Brachiaria pastures in the Atlantic forest region of the South of Bahia, Brazil. 260 $c2002 520 $aIt has been shown that with careful grazing management and addition of p and K. but not N. fertilisers Brachiaria pastures are able to maintain sustainable live weight gains over many years. However. standard on-farm practice. which generally involves high stocking rates. leads after a few years to pasture decline due mainly to N deficiency for grass regrowth. To generate an understanding of the mechanism of pasture decline and possible management options to mitigate this process. a study was performed in the Atlantic forest region of the south of Bahia state to study the N dynamics in pastures of Brachiaria humidicola subject to three different stocking rates of beef cattle. with and without the presence of the forage legume Desmodium ovalifolium. Despite the fact that the C:N ratio of the deposited litter was high (60 to 70) the rate of decomposition was very rapid (k --0.07 9 g-l day-1) and annual rates of N turnover through the litter pathway were between 105 and 170 kg N ha-1 year-1. In the grass-only pastures as stocking rate increased from 2 to 3 head ha -1. N recycled in the litter decreased by 11 %. but a further increase to 4 head ha-1 decreased N recycling by 30% suggesting that beyond a certain critical level higher grazing stocking rates would lead to pasture decline if there was no N addition. High stocking rates decreased the proportion of the legume in the sward. but at all rates the concentration of N in both the green and dead grass in the forage on offer and in the litter was higher in the mixed sward. The presence of the legume caused a decrease in the C:N ratio of the microbial biomass while both soil N minera1isation and nitrification increased. This increased rate of turnover of the microbia1 biomass and the contribution of N2 fixation to the legume resulted in large increases in the N recycled via litter deposition ranging from 42 to 155 kg N ha-1 year-1. 650 $aforage legumes 650 $aBrachiaria 650 $aLeguminosa Forrageira 700 1 $aTARRE, R. 700 1 $aMACEDO, R. 700 1 $aCADISCH, G. 700 1 $aREZENDE, C. de P. 700 1 $aPEREIRA, J. M. 700 1 $aBRAGA, J. M. 700 1 $aGOMIDE, J. A. 700 1 $aFERREIRA, E. 700 1 $aALVES, B. J. R. 700 1 $aURQUIAGA, S. 700 1 $aBODDEY, R. M. 773 $tNutrient Cycling in Agroecossytems, Netherlands$gv. 64, p. 257-271, 2002.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Registros recuperados : 25 | |
21. | | CANTARUTTI, R. B.; TARRE, R.; MACEDO, R.; CADISCH, G.; REZENDE, C. de P.; PEREIRA, J. M.; BRAGA, J. M.; GOMIDE, J. A.; FERREIRA, E.; ALVES, B. J. R.; URQUIAGA, S.; BODDEY, R. M. The effect of grazing intensity and the presence of a forage legume on nitrogen dynamics in Brachiaria pastures in the Atlantic forest region of the South of Bahia, Brazil. Nutrient Cycling in Agroecossytems, Netherlands, v. 64, p. 257-271, 2002.Biblioteca(s): Embrapa Agrobiologia. |
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22. | | RAMALHO, I. O.; REZENDE, C. de P.; PEREIRA, J. M.; SANTOS, C. A. dos; MONTEIRO, R. C.; ALVES, B. J. R.; CARVALÇHO, I. das N. O. de; URQUIAGA, S.; BODDEY, R. M. Deposition and decomposition of litter in periods of grazing and rest of a tropical pasture under rotational grazing. Ciência Rural, v. 49, n. 12, Epub Dec. 02, 2019 Título em Português: Deposição e decomposição de serapilheira em períodos de pastejo e descanso de uma pastagem tropical sob pastejo rotativo.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
Biblioteca(s): Embrapa Agrobiologia. |
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23. | | BODDEY, R. M.; MACEDO, R.; TARRÉ, R. M.; FERREIRA, E.; OLIVEIRA, O. C. de; REZENDE, C. de P.; CANTARUTTI, R. B.; PEREIRA, J. M.; ALVES, B. J. R.; URQUIAGA, S. Nitrogen cycling in Brachiaria pastures: the key to understanding the process of pasture decline. Agriculture Ecosystems & Environment, Amsterdam, v. 103, p. 389-403, 2004.Biblioteca(s): Embrapa Agrobiologia. |
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24. | | HOMEM, B. G. C.; LIMA, I. B. G. de; SPASIANI, P. P.; GUIMARÃES, B. C.; GUIMARÃES, G. D.; BERNARDES, T. F.; REZENDE, C. de P.; BODDEY, R. M.; CASAGRANDE, D. R. N-fertiliser application or legume integration enhances N cycling in tropical pastures. Nutrient Cycling in Agroecosystems, Published 02 September 2021.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
Biblioteca(s): Embrapa Agrobiologia. |
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25. | | SOUZA, W. dos S.; REZENDE, C. de P.; PEREIRA, J. M.; MONTEIRO, R. C.; SANTOS, C. A. dos; MACEDO, R. de O.; ALECRIM, F. B.; PINHEIRO, E. F. M.; CAMPOS, D. V. B. de; URQUIAGA, S.; ALVES, B. J. R.; BODDEY, R. M. Can N2 fixation by forage legumes build soil organic matter to rival fertilizer N in a tropical forest biome? Geoderma Regional, v. 33, e00646, Jun. 2023.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 3 |
Biblioteca(s): Embrapa Agrobiologia; Embrapa Solos. |
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Registros recuperados : 25 | |
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