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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Leite. Para informações adicionais entre em contato com cnpgl.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
21/08/2021 |
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Data da última atualização: |
21/08/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MONTEIRO, R. A. C.; CONGIO, G. F. de S.; SBRISSIA, A. F.; SILVA, S. C. da. |
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Afiliação: |
ROBERTA APARECIDA C MONTEIRO, CNPGL; GUILHERMO FRANCKLIN DE SOUZA CONGIO, Colombian Corporation for Agricultural Research; ANDRÉ FISCHER SBRISSIA, Universidade Federal de Santa Catarina; SILA CARNEIRO DA SILVA, Escola Superior de Agricultura "Luiz de Queiroz". |
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Título: |
Growth of Megathyrsus maximus cv. Mombaça as affected by grazing strategies and environmental seasonality. II. Dynamics of herbage accumulation. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Crop & Pasture Science, v. 72, p. 66-74, 2021. |
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DOI: |
https://doi.org/10.1071/CP20199 |
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Idioma: |
Inglês |
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Conteúdo: |
For tropical forage grasses, leaves are the main morphological component accumulated at the beginning of regrowth, and as leaf area index increases, plants change their growth pattern, allocating more resources to stem elongation as a means of optimising light capture. We hypothesised that, for Momba¸ca guineagrass, stem elongation and leaf senescence rate play a major role in determining net herbage accumulation rate (NHAR) and that senescence would be the key factor driving the reduction in NHAR when regrowth is interrupted beyond the critical leaf area index, that is, when canopy light interception (LI) exceeds 95%. Treatments corresponded to all combinations of two levels of pre-grazing canopy LI during regrowth (LI95% and LIMax) and two post-grazing heights (30 and 50 cm), and were allocated to experimental units according to a randomised complete block design with four replications. Measurements were performed throughout contrasting climatic conditions during four seasons from January 2001 to February 2002. Overall, spring and the two summers were the seasons when rates of leaf appearance, leaf elongation and leaf growth rate were higher, and leaf lifespan was smaller; the inverse occurred during autumn-winter. Despite the lack of statistically significant differences in NHAR between LI treatments during some seasons of the year, the ratio of leaf growth rate to NHAR was consistently higher for LI95% than LIMax. The pre-grazing target of LI95% was also efficient for decreasing stem elongation and leaf senescence rate. Increased senescence on individual tillers was the key driver generating modifications in the patterns of variation in NHAR beyond the critical leaf area index, suggesting that there is no advantage in extending the regrowth period when the main objective is to maximise leaf growth rate or NHAR. MenosFor tropical forage grasses, leaves are the main morphological component accumulated at the beginning of regrowth, and as leaf area index increases, plants change their growth pattern, allocating more resources to stem elongation as a means of optimising light capture. We hypothesised that, for Momba¸ca guineagrass, stem elongation and leaf senescence rate play a major role in determining net herbage accumulation rate (NHAR) and that senescence would be the key factor driving the reduction in NHAR when regrowth is interrupted beyond the critical leaf area index, that is, when canopy light interception (LI) exceeds 95%. Treatments corresponded to all combinations of two levels of pre-grazing canopy LI during regrowth (LI95% and LIMax) and two post-grazing heights (30 and 50 cm), and were allocated to experimental units according to a randomised complete block design with four replications. Measurements were performed throughout contrasting climatic conditions during four seasons from January 2001 to February 2002. Overall, spring and the two summers were the seasons when rates of leaf appearance, leaf elongation and leaf growth rate were higher, and leaf lifespan was smaller; the inverse occurred during autumn-winter. Despite the lack of statistically significant differences in NHAR between LI treatments during some seasons of the year, the ratio of leaf growth rate to NHAR was consistently higher for LI95% than LIMax. The pre-grazing target of LI95% was also efficient for de... Mostrar Tudo |
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Palavras-Chave: |
Canopy light interception; Capim Mombaça; Ecofisiologia; Estresse abiótico; Interceptação da luz. |
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Thesagro: |
Capim Colonião; Gramínea Forrageira; Manejo; Morfogênese; Pastejo; Variação Sazonal. |
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Thesaurus Nal: |
Abiotic stress; Ecophysiology; Grazing management; Morphogenesis. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 02926naa a2200349 a 4500
001 2133784
005 2021-08-21
008 2021 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1071/CP20199$2DOI
100 1 $aMONTEIRO, R. A. C.
245 $aGrowth of Megathyrsus maximus cv. Mombaça as affected by grazing strategies and environmental seasonality. II. Dynamics of herbage accumulation.$h[electronic resource]
260 $c2021
520 $aFor tropical forage grasses, leaves are the main morphological component accumulated at the beginning of regrowth, and as leaf area index increases, plants change their growth pattern, allocating more resources to stem elongation as a means of optimising light capture. We hypothesised that, for Momba¸ca guineagrass, stem elongation and leaf senescence rate play a major role in determining net herbage accumulation rate (NHAR) and that senescence would be the key factor driving the reduction in NHAR when regrowth is interrupted beyond the critical leaf area index, that is, when canopy light interception (LI) exceeds 95%. Treatments corresponded to all combinations of two levels of pre-grazing canopy LI during regrowth (LI95% and LIMax) and two post-grazing heights (30 and 50 cm), and were allocated to experimental units according to a randomised complete block design with four replications. Measurements were performed throughout contrasting climatic conditions during four seasons from January 2001 to February 2002. Overall, spring and the two summers were the seasons when rates of leaf appearance, leaf elongation and leaf growth rate were higher, and leaf lifespan was smaller; the inverse occurred during autumn-winter. Despite the lack of statistically significant differences in NHAR between LI treatments during some seasons of the year, the ratio of leaf growth rate to NHAR was consistently higher for LI95% than LIMax. The pre-grazing target of LI95% was also efficient for decreasing stem elongation and leaf senescence rate. Increased senescence on individual tillers was the key driver generating modifications in the patterns of variation in NHAR beyond the critical leaf area index, suggesting that there is no advantage in extending the regrowth period when the main objective is to maximise leaf growth rate or NHAR.
650 $aAbiotic stress
650 $aEcophysiology
650 $aGrazing management
650 $aMorphogenesis
650 $aCapim Colonião
650 $aGramínea Forrageira
650 $aManejo
650 $aMorfogênese
650 $aPastejo
650 $aVariação Sazonal
653 $aCanopy light interception
653 $aCapim Mombaça
653 $aEcofisiologia
653 $aEstresse abiótico
653 $aInterceptação da luz
700 1 $aCONGIO, G. F. de S.
700 1 $aSBRISSIA, A. F.
700 1 $aSILVA, S. C. da
773 $tCrop & Pasture Science$gv. 72, p. 66-74, 2021.
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Registro original: |
Embrapa Gado de Leite (CNPGL) |
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URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Tabuleiros Costeiros. |
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Data corrente: |
10/11/2010 |
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Data da última atualização: |
17/01/2011 |
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Autoria: |
COSTA, J. L. da S.; OLIVEIRA, V. C. de; VIANA, F. M. P.; LEAL, E. C.; WARWICK, D. R. N. |
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Afiliação: |
JEFFERSON LUIS DA SILVA COSTA, CPATC; EDNA CASTILHO LEAL, CPATC; DULCE REGINA NUNES WARWICK, CPATC. |
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Título: |
Aprimoramento do conhecimento científico e desenvolvimento de tecnologias para o controle das principais doenças do coqueiro. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Aracaju: Embrapa Tabuleiros Costeiros, 2002. |
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Páginas: |
117 p. |
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Série: |
(Embrapa Tabuleiros Costeiros. Documentos, 39). |
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Idioma: |
Português |
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Conteúdo: |
Queima das folhas e lixa do coqueiro; Controle químico e biológico; Manipulação e estudos dos causadores de doenças foliares; Epidemiologia da podridão seca. |
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Palavras-Chave: |
Controle de doença; Coqueiro; Doença folhiar. |
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Thesagro: |
Coco; Doença de Planta. |
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Categoria do assunto: |
-- |
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URL: |
https://www.cpatc.embrapa.br/download/Documentos39.pdf
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Marc: |
LEADER 00928nam a2200241 a 4500
001 1866689
005 2011-01-17
008 2002 bl uuuu 00u1 u #d
100 1 $aCOSTA, J. L. da S.
245 $aAprimoramento do conhecimento científico e desenvolvimento de tecnologias para o controle das principais doenças do coqueiro.$h[electronic resource]
260 $aAracaju: Embrapa Tabuleiros Costeiros$c2002
300 $a117 p.
490 $a(Embrapa Tabuleiros Costeiros. Documentos, 39).
520 $aQueima das folhas e lixa do coqueiro; Controle químico e biológico; Manipulação e estudos dos causadores de doenças foliares; Epidemiologia da podridão seca.
650 $aCoco
650 $aDoença de Planta
653 $aControle de doença
653 $aCoqueiro
653 $aDoença folhiar
700 1 $aOLIVEIRA, V. C. de
700 1 $aVIANA, F. M. P.
700 1 $aLEAL, E. C.
700 1 $aWARWICK, D. R. N.
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Embrapa Tabuleiros Costeiros (CPATC) |
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