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144. | | LUDEWIGS, T.; ARCO VERDE, M. F.; SOUZA, S. G. A. de; FERNANDES, E. C. M. Ocorrencia e distribuicao de especies do genero Vismia em capoeiras de terra firme na Amazonia Ocidental. In: CONGRESSO BRASILEIRO SOBRE SISTEMAS AGROFLORESTAIS, 1.; ENCONTRO SOBRE SISTEMAS AGROFLORESTAIS NOS PAÍSES DO MERCOSUL, 1., 1994, Porto Velho. Anais. Colombo: EMBRAPA-CNPF, 1994. v. 2, p. 467. (EMBRAPA-CNPF. Documentos, 27). Biblioteca(s): Embrapa Florestas. |
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148. | | FERNANDES, E. C. M.; WANDELLI, E. V.; PERIN, R.; SOUSA, S. G. A. de. Restoring productivity to degraded pasture lands in the Amazon through agroforestry practices. In: UPHOFF, N.; BALL, A. S.; FERNANDES, E.; HERREN, H.; HUSSON, O.; LAING, M.; PALM, C.; PRETTY, J.; SANCHEZ, P.; SANGINGA, N.; THIES, J. (Ed.). Biological approaches to sustainable soil systems. Boca Raton: CRC, 2006. p. 305-321. (Books in soils, plants, and the environment, v. 113). Biblioteca(s): Embrapa Amazônia Ocidental. |
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150. | | SCHWENDENER, C. M.; LEHMANN, J.; RONDON, M.; WANDELLI, E.; FERNANDES, E. Soil mineral N dynamics beneath mixtures of leaves form legume and fruit trees in Central Amazonian multi-strata agroforests. Acta Amazonica, Manaus, v. 37, n. 3, p. 313-320, set. 2007. Biblioteca(s): Embrapa Florestas. |
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151. | | SCHWENDENER, C. M.; LEHMANN, J.; RONDON, M.; WANDELLI, E.; FERNANDES, E. Soil mineral N dynamics beneath mixtures of leaves from legume and fruit trees in Central Amazonian multi-strata agroforests. Acta Amazônica, Manaus, v. 37, n. 3, p. 313-320, set. 2007. Biblioteca(s): Embrapa Amazônia Ocidental. |
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152. | | ARCO-VERDE, M. F.; MATOS, J. C. de S.; FERNANDES, E. C. M. Selecao de especies de leguminosas arboreas para areas de terra firme na Amazonia Ocidental. In: CONGRESSO BRASILEIRO SOBRE SISTEMAS AGROFLORESTAIS, 1.; ENCONTRO SOBRE SISTEMAS AGROFLORESTAIS NOS PAÍSES DO MERCOSUL, 1., 1994, Porto Velho. Anais. Colombo: EMBRAPA-CNPF, 1994. v. 2, p. 469. (EMBRAPA-CNPF. Documentos, 27). Tema Central: Sistemas Agroflorestais no Desenvolvimento Sustentável. v.2 Trabalhos voluntarios. Editores Luciano J. Montoya e Moacir J.S. Medrado. Biblioteca(s): Embrapa Florestas. |
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154. | | WANDELLI, E. V.; FERNANDES, E.; SOUSA, S. G. A. de; PERIN, R.; COSTA, J. R. da. Serviços ambientais e produtos de sistemas agroflorestais e da vegetação secundária no processo de recuperação de áreas degradadas na Amazônia Central. In: CONGRESSO BRASILEIRO DE SISTEMAS AGROFLORESTAIS, 5., 2004, Curitiba. SAFs: desenvolvimento com proteção ambiental: anais. Colombo: Embrapa Florestas, 2004. 1 CD-ROM. (Embrapa Florestas. Documentos, 98). Trabalhos orais. Sessão Temática IV. Biblioteca(s): Embrapa Amazônia Ocidental. |
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159. | | QUEIROZ NETO, J. P. de; SAKAMOTO, A. Y.; LUCATI, H. M.; FERNANDES, E.; CAPELLARI, B. Solos de cordilheiras, baias e lagoas salinas na area do Leque (Pantanal da Nhecolandia, MS). In: SEMANA DE ESTUDOS DE GEOGRAFIA DO CEUL-UFMS, 8.; ENCONTRO SUL-MATO-GROSSENSE DE GEOGRAFOS, 8., 1997, Tres Lagoas. Anais... Tres Lagoas: CEUL / UFMS, 1997. p.14-18. Biblioteca(s): Embrapa Pantanal. |
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Registros recuperados : 393 | |
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Registro Completo
Biblioteca(s): |
Embrapa Acre. |
Data corrente: |
21/02/2020 |
Data da última atualização: |
02/07/2021 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
B - 5 |
Autoria: |
RUEDA, B. L.; McROBERTS, K. C.; BLAKE, R. W.; NICHOLSON, C. F.; VALENTIM, J. F.; FERNANDES, E. C. M. |
Afiliação: |
B. L. Rueda; K. C. McRoberts; R. W. Blake; C. F. Nicholson; JUDSON FERREIRA VALENTIM, CPAF-AC; E. C. M. Fernandes. |
Título: |
Nutrient status of cattle grazing systems in the western brazilian Amazon. |
Ano de publicação: |
2020 |
Fonte/Imprenta: |
Cogent Food & Agriculture, v. 6, 1722350, 2020. |
ISSN: |
2331-1932 |
DOI: |
10.1080/23311932.2020.1722350 |
Idioma: |
Inglês |
Conteúdo: |
Low-input cultivated pastures to feed cattle have dominated land use after forest clearing for decades in the western Brazilian Amazon. This study was undertaken to help understand the inherent nutrient supply dynamics underwriting cattle performance on three farms in the state of Acre. We assessed soil chemical and physical properties associated over time with different land uses following forest clearing. This information permitted specifying a conceptual model of nutrient stocks and flows under the observed grazing system, which produced insights about the dynamics of soil nutrient degradation. Above ground forage mass, topsoil nutrient concentrations and soil bulk density were measured. Land covers were Brachiaria spp. grasses, a grass-Pueraria phaseoloides mix, cropland and forest. Most soil nutrient parameters initially decreased after clearing, gradually recovering over time with grass-only pastures; however, 20 yr-old pastures had 20% less forage mass. Most pasture system nutrients on these farms resided in topsoil and roots, where large stocks of mature forage supported soil fertility with recycled nutrients from litter. Estimates of partial topsoil nutrient balances were negative. This suggested that corresponding nutrient stocks and the accumulation of forage mass were probably maintained primarily through the sum of inflows from cattle excreta, the subsoil, soil organic matter, and litter mineralization with scant input of commercial fertilizer. Therefore, herd management to increase animal system productivity via higher stocking rates on vegetatively younger forage requires monitoring of nutrient stocks and flows and fertilization that assures replenishment of the nutrients extracted. Otherwise, rapid depletion of soil nutrient stocks will lead to system degradation and failure. MenosLow-input cultivated pastures to feed cattle have dominated land use after forest clearing for decades in the western Brazilian Amazon. This study was undertaken to help understand the inherent nutrient supply dynamics underwriting cattle performance on three farms in the state of Acre. We assessed soil chemical and physical properties associated over time with different land uses following forest clearing. This information permitted specifying a conceptual model of nutrient stocks and flows under the observed grazing system, which produced insights about the dynamics of soil nutrient degradation. Above ground forage mass, topsoil nutrient concentrations and soil bulk density were measured. Land covers were Brachiaria spp. grasses, a grass-Pueraria phaseoloides mix, cropland and forest. Most soil nutrient parameters initially decreased after clearing, gradually recovering over time with grass-only pastures; however, 20 yr-old pastures had 20% less forage mass. Most pasture system nutrients on these farms resided in topsoil and roots, where large stocks of mature forage supported soil fertility with recycled nutrients from litter. Estimates of partial topsoil nutrient balances were negative. This suggested that corresponding nutrient stocks and the accumulation of forage mass were probably maintained primarily through the sum of inflows from cattle excreta, the subsoil, soil organic matter, and litter mineralization with scant input of commercial fertilizer. Therefore, herd m... Mostrar Tudo |
Palavras-Chave: |
Acre; Amazonia Occidental; Amazônia Ocidental; Estatus nutricional; Fertilidad del suelo; Nutrición animal; Pastoreando; Western Amazon. |
Thesagro: |
Estado Nutricional; Fertilidade do Solo; Nutrição Animal; Pastagem. |
Thesaurus NAL: |
Animal nutrition; Grazing; Nutritional status; Soil fertility. |
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/211166/1/26979.pdf
|
Marc: |
LEADER 02941naa a2200397 a 4500 001 2120545 005 2021-07-02 008 2020 bl uuuu u00u1 u #d 022 $a2331-1932 024 7 $a10.1080/23311932.2020.1722350$2DOI 100 1 $aRUEDA, B. L. 245 $aNutrient status of cattle grazing systems in the western brazilian Amazon.$h[electronic resource] 260 $c2020 520 $aLow-input cultivated pastures to feed cattle have dominated land use after forest clearing for decades in the western Brazilian Amazon. This study was undertaken to help understand the inherent nutrient supply dynamics underwriting cattle performance on three farms in the state of Acre. We assessed soil chemical and physical properties associated over time with different land uses following forest clearing. This information permitted specifying a conceptual model of nutrient stocks and flows under the observed grazing system, which produced insights about the dynamics of soil nutrient degradation. Above ground forage mass, topsoil nutrient concentrations and soil bulk density were measured. Land covers were Brachiaria spp. grasses, a grass-Pueraria phaseoloides mix, cropland and forest. Most soil nutrient parameters initially decreased after clearing, gradually recovering over time with grass-only pastures; however, 20 yr-old pastures had 20% less forage mass. Most pasture system nutrients on these farms resided in topsoil and roots, where large stocks of mature forage supported soil fertility with recycled nutrients from litter. Estimates of partial topsoil nutrient balances were negative. This suggested that corresponding nutrient stocks and the accumulation of forage mass were probably maintained primarily through the sum of inflows from cattle excreta, the subsoil, soil organic matter, and litter mineralization with scant input of commercial fertilizer. Therefore, herd management to increase animal system productivity via higher stocking rates on vegetatively younger forage requires monitoring of nutrient stocks and flows and fertilization that assures replenishment of the nutrients extracted. Otherwise, rapid depletion of soil nutrient stocks will lead to system degradation and failure. 650 $aAnimal nutrition 650 $aGrazing 650 $aNutritional status 650 $aSoil fertility 650 $aEstado Nutricional 650 $aFertilidade do Solo 650 $aNutrição Animal 650 $aPastagem 653 $aAcre 653 $aAmazonia Occidental 653 $aAmazônia Ocidental 653 $aEstatus nutricional 653 $aFertilidad del suelo 653 $aNutrición animal 653 $aPastoreando 653 $aWestern Amazon 700 1 $aMcROBERTS, K. C. 700 1 $aBLAKE, R. W. 700 1 $aNICHOLSON, C. F. 700 1 $aVALENTIM, J. F. 700 1 $aFERNANDES, E. C. M. 773 $tCogent Food & Agriculture$gv. 6, 1722350, 2020.
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Embrapa Acre (CPAF-AC) |
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