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| Registros recuperados : 33 | |
| 14. |  | MACHADO, L. C.; CRUVINEL, P. E.; RODRIGUES, V. G. S. Desenvolvimento de um método para a avaliação de impactos ambientais decorrentes de possíveis derivas observadas na aplicação aérea de agrotóxicos. In: JORNADA CIENTÍFICA - EMBRAPA SÃO CARLOS, 9., 2017, São Carlos, SP. Anais... São Carlos: Embrapa Pecuária Sudeste: Embrapa Instrumentação, 2017. p. 29. Editores técnicos: Alexandre Berndt, Ana Rita de Araujo Nogueira, Bianca Baccili Zanotto Vigna, Juliana Gonçalves Costa, Lea Chapaval, Manuel Antonio Chagas Jacinto, Patricia Menezes Santos. (Embrapa Pecuária Sudeste, Documentos, 126).| Biblioteca(s): Embrapa Instrumentação. |
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| 16. | | ERPEN, J. G.; VINCENZI, M. L.; MACHADO, L. C. P.; CEZAR, I. M. Disponibilidade de fósforo em solos de pastagens manejados em sistemas convencional e pastoreio racional voisin em Deodápolis - MS. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 41., 2004, Campo Grande, MS. A produção animal e a segurança alimentar: anais dos simpósios e dos resumos. Campo Grande, MS: Sociedade Brasileira de Zootecnia: Embrapa Gado de Corte, 2004. 4 p. FORR 284. 1 CD-ROM. CNPGC.| Biblioteca(s): Embrapa Gado de Corte. |
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| 20. | | ERPEN, J. G.; VINCENZI, M. L.; MACHADO, L. C. P.; CEZAR, I. M. Rede de informações e a tomada de decisão em fazendeiros do sistema convencional e Pastoreiro Racional Voisin, na região de Dourados-MS. In: CONGRESSO INTERNACIONAL DE ZOOTECNIA, 7.; CONGRESSO NACIONAL DE ZOOTECNIA, 10.; REUNIÃO NACIONAL DE ENSINO DE ZOOTECNIA, 11.; FÓRUM DE ENTIDADES DE ZOOTECNIA, 28.; FÓRUM DE COORDENADORES DE CURSOS DE ZOOTECNIA DAS UNIVERSIDADES BRASILEIRAS, 1., 2005, Campo Grande, MS. Produção animal e responsabilidade: [anais]. Campo Grande, MS: ABZ: UEMS: UFMS: CPAP: MAPA, 2005. Zootec 2005 4 p. 1 CD-ROM. Zootec 2005.| Biblioteca(s): Embrapa Gado de Corte. |
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| Registros recuperados : 33 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Acre. |
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Data corrente: |
21/02/2020 |
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Data da última atualização: |
02/07/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 5 |
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Autoria: |
RUEDA, B. L.; McROBERTS, K. C.; BLAKE, R. W.; NICHOLSON, C. F.; VALENTIM, J. F.; FERNANDES, E. C. M. |
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Afiliação: |
B. L. Rueda; K. C. McRoberts; R. W. Blake; C. F. Nicholson; JUDSON FERREIRA VALENTIM, CPAF-AC; E. C. M. Fernandes. |
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Título: |
Nutrient status of cattle grazing systems in the western brazilian Amazon. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Cogent Food & Agriculture, v. 6, 1722350, 2020. |
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ISSN: |
2331-1932 |
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DOI: |
10.1080/23311932.2020.1722350 |
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Idioma: |
Inglês |
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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 |
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Palavras-Chave: |
Acre; Amazonia Occidental; Amazônia Ocidental; Estatus nutricional; Fertilidad del suelo; Nutrición animal; Pastoreando; Western Amazon. |
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Thesagro: |
Estado Nutricional; Fertilidade do Solo; Nutrição Animal; Pastagem. |
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Thesaurus NAL: |
Animal nutrition; Grazing; Nutritional status; Soil fertility. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/211166/1/26979.pdf
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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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