Gas exchange in Massai grass fertilized with nitrogen and grazed by sheep.

The knowledge of gas exchanges in forage plants is essential for a better understanding of the process of forage biomass production in pasture. This study evaluated the gas exchange in massai grass fertilized with increasing levels of nitrogen fertilizer (control - without nitrogen fertilizer; 400;...

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Detalhes bibliográficos
Autores: LOPES, M. N., CÂNDIDO, M. J. D., POMPEU, R. C. F. F., SILVA, R. G. da, LACERDA, C. F. de, BEZERRA, M. A., MORAIS NETO, L. B. de, CARNEIRO, M. S. de S.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2020
País:Brasil
Recursos:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
Repositorio:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
Idioma:inglés
OAI Identifier:oai:www.alice.cnptia.embrapa.br:doc/1122658
Acesso em linha:http://www.alice.cnptia.embrapa.br/alice/handle/doc/1122658
http://dx.doi.org/10.14393/BJ-v36n1a2020-42411
Access Level:acceso abierto
Palavra-chave:Chlorophyll relative index
Leaf photosynthesis
Nitrogen fertilization
Capim Massai
Brazilian Northeast
Gramínea Forrageira
Panicum Maximum
Forage grasses
Biomass production
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repository_id_str
spelling Gas exchange in Massai grass fertilized with nitrogen and grazed by sheep.Chlorophyll relative indexLeaf photosynthesisNitrogen fertilizationCapim MassaiBrazilian NortheastGramínea ForrageiraPanicum MaximumForage grassesBiomass productionThe knowledge of gas exchanges in forage plants is essential for a better understanding of the process of forage biomass production in pasture. This study evaluated the gas exchange in massai grass fertilized with increasing levels of nitrogen fertilizer (control - without nitrogen fertilizer; 400; 800 and 1200 kg ha-1 year-1) and under rotational grazing by sheep, in a completely randomized design with repeated measures in time. The rest period was approximately 1.5 new leaves per tiller, as determined in the pre-test at the beginning of the experiment, providing interval of 22; 18; 16 and 13 days for the levels 0.0 - control; 400; 800 and 1200 kg ha-1 year-1 nitrogen, respectively. The animals used to lower the sward height to the recommended residual height were sheep (½ Morada Nova x ½ undefined breed), placed in paddocks of 42.3 m2 . As the animals grazed, the height of the sward was monitored with a ruler until the canopy reached the recommended residual height of approximately 15 cm, corresponding to the residual LAI of exit of the animals from the paddock at approximately 1.5, as determined in a pre-test to set up the experiment. The variables stomatal conductance, leaf photosynthesis rate, leaf carbon dioxide concentration, photosynthesis/transpiration ratio, chlorophyll relative index and nitrogen sufficiency index revealed a positive linear response to nitrogen fertilization. Nitrogen fertilization level at 1200 kg ha-1 year-1 caused an increment of 92.3% in leaf photosynthesis rate in relation to the control. The leaf temperature and photosynthesis/conductance ratio were reduced with increasing nitrogen levels. The leaf transpiration showed a quadratic response with maximum point with increasing nitrogen levels. Nitrogen fertilization favor the gas exchange in massai grass up to the last level tested. [Trocas gasosas em capim-massai adubado com nitrogênio e pastejado por ovinos].MARCOS NEVES LOPES; MAGNO JOSÉ DUARTE CÂNDIDO; ROBERTO CLAUDIO FERNANDES F POMPEU, CNPC; RODRIGO GREGÓRIO DA SILVA; CLAUDIVAN FEITOSA DE LACERDA; MARLOS ALVES BEZERRA, CNPAT; LUIZ BARRETO DE MORAIS NETO; MARIA SOCORRO DE SOUZA CARNEIRO.2020-12-15T09:02:37Z2020-12-15T09:02:37Z2020-05-272020info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleBioscience Journal, v. 36, n. 1, p. 152-160, Jan./Feb. 2020.http://www.alice.cnptia.embrapa.br/alice/handle/doc/1122658http://dx.doi.org/10.14393/BJ-v36n1a2020-42411enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPALOPES, M. N.CÂNDIDO, M. J. D.POMPEU, R. C. F. F.SILVA, R. G. daLACERDA, C. F. deBEZERRA, M. A.MORAIS NETO, L. B. deCARNEIRO, M. S. de S.2020-12-15T09:02:45Zoai:www.alice.cnptia.embrapa.br:doc/1122658Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542020-12-15T09:02:45Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Gas exchange in Massai grass fertilized with nitrogen and grazed by sheep.
title Gas exchange in Massai grass fertilized with nitrogen and grazed by sheep.
spellingShingle Gas exchange in Massai grass fertilized with nitrogen and grazed by sheep.
LOPES, M. N.
Chlorophyll relative index
Leaf photosynthesis
Nitrogen fertilization
Capim Massai
Brazilian Northeast
Gramínea Forrageira
Panicum Maximum
Forage grasses
Biomass production
title_short Gas exchange in Massai grass fertilized with nitrogen and grazed by sheep.
title_full Gas exchange in Massai grass fertilized with nitrogen and grazed by sheep.
title_fullStr Gas exchange in Massai grass fertilized with nitrogen and grazed by sheep.
title_full_unstemmed Gas exchange in Massai grass fertilized with nitrogen and grazed by sheep.
title_sort Gas exchange in Massai grass fertilized with nitrogen and grazed by sheep.
dc.creator.none.fl_str_mv LOPES, M. N.
CÂNDIDO, M. J. D.
POMPEU, R. C. F. F.
SILVA, R. G. da
LACERDA, C. F. de
BEZERRA, M. A.
MORAIS NETO, L. B. de
CARNEIRO, M. S. de S.
author LOPES, M. N.
author_facet LOPES, M. N.
CÂNDIDO, M. J. D.
POMPEU, R. C. F. F.
SILVA, R. G. da
LACERDA, C. F. de
BEZERRA, M. A.
MORAIS NETO, L. B. de
CARNEIRO, M. S. de S.
author_role author
author2 CÂNDIDO, M. J. D.
POMPEU, R. C. F. F.
SILVA, R. G. da
LACERDA, C. F. de
BEZERRA, M. A.
MORAIS NETO, L. B. de
CARNEIRO, M. S. de S.
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv MARCOS NEVES LOPES; MAGNO JOSÉ DUARTE CÂNDIDO; ROBERTO CLAUDIO FERNANDES F POMPEU, CNPC; RODRIGO GREGÓRIO DA SILVA; CLAUDIVAN FEITOSA DE LACERDA; MARLOS ALVES BEZERRA, CNPAT; LUIZ BARRETO DE MORAIS NETO; MARIA SOCORRO DE SOUZA CARNEIRO.
dc.subject.por.fl_str_mv Chlorophyll relative index
Leaf photosynthesis
Nitrogen fertilization
Capim Massai
Brazilian Northeast
Gramínea Forrageira
Panicum Maximum
Forage grasses
Biomass production
topic Chlorophyll relative index
Leaf photosynthesis
Nitrogen fertilization
Capim Massai
Brazilian Northeast
Gramínea Forrageira
Panicum Maximum
Forage grasses
Biomass production
description The knowledge of gas exchanges in forage plants is essential for a better understanding of the process of forage biomass production in pasture. This study evaluated the gas exchange in massai grass fertilized with increasing levels of nitrogen fertilizer (control - without nitrogen fertilizer; 400; 800 and 1200 kg ha-1 year-1) and under rotational grazing by sheep, in a completely randomized design with repeated measures in time. The rest period was approximately 1.5 new leaves per tiller, as determined in the pre-test at the beginning of the experiment, providing interval of 22; 18; 16 and 13 days for the levels 0.0 - control; 400; 800 and 1200 kg ha-1 year-1 nitrogen, respectively. The animals used to lower the sward height to the recommended residual height were sheep (½ Morada Nova x ½ undefined breed), placed in paddocks of 42.3 m2 . As the animals grazed, the height of the sward was monitored with a ruler until the canopy reached the recommended residual height of approximately 15 cm, corresponding to the residual LAI of exit of the animals from the paddock at approximately 1.5, as determined in a pre-test to set up the experiment. The variables stomatal conductance, leaf photosynthesis rate, leaf carbon dioxide concentration, photosynthesis/transpiration ratio, chlorophyll relative index and nitrogen sufficiency index revealed a positive linear response to nitrogen fertilization. Nitrogen fertilization level at 1200 kg ha-1 year-1 caused an increment of 92.3% in leaf photosynthesis rate in relation to the control. The leaf temperature and photosynthesis/conductance ratio were reduced with increasing nitrogen levels. The leaf transpiration showed a quadratic response with maximum point with increasing nitrogen levels. Nitrogen fertilization favor the gas exchange in massai grass up to the last level tested. [Trocas gasosas em capim-massai adubado com nitrogênio e pastejado por ovinos].
publishDate 2020
dc.date.none.fl_str_mv 2020-12-15T09:02:37Z
2020-12-15T09:02:37Z
2020-05-27
2020
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv Bioscience Journal, v. 36, n. 1, p. 152-160, Jan./Feb. 2020.
http://www.alice.cnptia.embrapa.br/alice/handle/doc/1122658
http://dx.doi.org/10.14393/BJ-v36n1a2020-42411
identifier_str_mv Bioscience Journal, v. 36, n. 1, p. 152-160, Jan./Feb. 2020.
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/1122658
http://dx.doi.org/10.14393/BJ-v36n1a2020-42411
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
collection Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
repository.name.fl_str_mv Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv cg-riaa@embrapa.br
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score 15,301629

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