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Registro Completo |
Biblioteca(s): |
Embrapa Solos. |
Data corrente: |
22/11/2002 |
Data da última atualização: |
09/03/2023 |
Tipo da produção científica: |
Documentos |
Autoria: |
CARVALHO, A. P. de; LARACH, J. O. I.; JACOMINE, P. K. T.; CAMARGO, M. N. (comp.). |
Afiliação: |
AMERICO PEREIRA DE CARVALHO, CNPS; JORGE OLMOS ITURRI LARACH, CNPS; PAULO KLINGER TITO JACOMINE, CNPS; MARCELO NUNES CAMARGO, CNPS. |
Título: |
Critérios para distinção de classes de solos e de fases de unidades de mapeamento: normas em uso pelo SNLCS. |
Ano de publicação: |
1988 |
Fonte/Imprenta: |
Rio de Janeiro: EMBRAPA-SNLCS, 1988. |
Páginas: |
67 p. |
Série: |
(EMBRAPA-SNLCS. Documentos, 11). |
ISSN: |
0103-0523 |
Idioma: |
Português |
Conteúdo: |
Critérios para distinção de classes de solos; Critérios para distinção de fases de unidades de mapeamento. |
Thesagro: |
Análise do Solo; Classificação do Solo; Solo. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/36148/1/criterios.pdf
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Marc: |
LEADER 00756nam a2200217 a 4500 001 1337549 005 2023-03-09 008 1988 bl uuuu 00u1 u #d 022 $a0103-0523 100 1 $aCARVALHO, A. P. de 245 $aCritérios para distinção de classes de solos e de fases de unidades de mapeamento$bnormas em uso pelo SNLCS. 260 $aRio de Janeiro: EMBRAPA-SNLCS$c1988 300 $a67 p. 490 $a(EMBRAPA-SNLCS. Documentos, 11). 520 $aCritérios para distinção de classes de solos; Critérios para distinção de fases de unidades de mapeamento. 650 $aAnálise do Solo 650 $aClassificação do Solo 650 $aSolo 700 1 $aLARACH, J. O. I. 700 1 $aJACOMINE, P. K. T. 700 1 $aCAMARGO, M. N.
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Embrapa Solos (CNPS) |
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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
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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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