| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Pecuária Sudeste. |
|
Data corrente: |
31/07/2012 |
|
Data da última atualização: |
16/02/2023 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Autoria: |
SANTOS, P. M.; THORNTON, B.; CORSI, M. |
|
Afiliação: |
PATRICIA MENEZES SANTOS, CPPSE; BARRY THORNTON, THE JAMES HUTTON INSTITUE/ ABERDEEN; MOACIR CORSI, PROF. DO DEPARTAMENTO DE ZOOTECNIA - ESALQ/PIRACICABA. |
|
Título: |
Adaptation of the C4 grass Panicum maximum to defoliation is related to plasticity of N uptake, mobilisation and allocation patterns. |
|
Ano de publicação: |
2012 |
|
Fonte/Imprenta: |
Scientia Agricola, v. 69, n. 5, p. 293-299, sep./oct. 2012. |
|
DOI: |
https://doi.org/10.1590/S0103-90162012000500002 |
|
Idioma: |
Inglês |
|
Conteúdo: |
Dry mass production and persistence of Panicum maximum pastures depends on nitrogen supply. Defoliation influences N uptake and allocation patterns yet its effects on plasticity of N dynamics in P. maximum have not been investigated. Stable isotopes of N (15N) were used in order to test the hypothesis that defoliation in terms of proportion of the leaf area removed effects N mobilisation, uptake and allocation patterns in P. maximum. The plants were initially cut weekly to a height of either 0.15 m or 0.30 m for seven weeks. Eight weeks after the first defoliation, all plants were defoliated for a final time to remove 0, 25, 50, 75 or 100 % of the area of each individual leaf blade of the main tiller. Root N uptake was reduced when all leaf area was removed, but more lenient defoliation improved N uptake due to a positive effect on specific N uptake. Young leaves, side tillers and roots were the main sinks for N from root uptake. Roots of P. maximum became a net source of N for mobilisation immediately after severe defoliation. Root uptake was the main source of N for new growth in P. maximum plants. Allocation pattern of mobilised N was different from that of N derived from root uptake. It was concluded that adaptation of P. maximum to defoliation is related to plasticity of N uptake, mobilisation and allocation, but changes in N dynamics did not offset negative impacts of complete defoliation of the plants. |
|
Palavras-Chave: |
Clipping height; Guineagrass; Organic reserves; Tropical grass. |
|
Thesaurus Nal: |
regrowth. |
|
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
|
URL: |
https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/930067/1/PROCI2012.00099.pdf
|
|
Marc: |
null
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
Registro Completo
|
Biblioteca(s): |
Embrapa Acre. |
|
Data corrente: |
06/01/2006 |
|
Data da última atualização: |
05/07/2024 |
|
Tipo da produção científica: |
Resumo em Anais de Congresso |
|
Autoria: |
OLIVEIRA, M. V. N. d'. |
|
Afiliação: |
MARCUS VINICIO NEVES D OLIVEIRA, CPAF-AC. |
|
Título: |
Sustainable forest management for small farmers in Acre state in the Brazilian Amazon. |
|
Ano de publicação: |
2000 |
|
Fonte/Imprenta: |
In: SIMPÓSIO INTERNACIONAL DA IUFRO, 2000, Belém, PA. Manejo integrado de florestas úmidas neotropicais por indústrias e comunidades: aplicando resultados de pesquisa, envolvendo atores e definindo políticas públicas: resumos. Belém, PA: IUFRO, 2000. |
|
Páginas: |
p. 48. |
|
Idioma: |
Inglês |
|
Conteúdo: |
This paper has the aim of presenting a forest management system to be applied on small farms, especially in the settlement projects of the Brazilian Amazon. |
|
Palavras-Chave: |
Acre; Manejo florestal. |
|
Thesaurus NAL: |
Amazonia. |
|
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
|
URL: |
https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/503642/1/12486.pdf
|
|
Marc: |
null
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Acre (CPAF-AC) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
