Qualidade fisiológica de sementes e tamanho de amostra de azevém submetido a manejos de pastejo animal

Detalhes bibliográficos
Autor(a) principal: Müller, Caren Alessandra
Data de Publicação: 2020
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Manancial - Repositório Digital da UFSM
dARK ID: ark:/26339/001300000cmk8
Texto Completo: http://repositorio.ufsm.br/handle/1/23186
Resumo: Ryegrass (Lolium multiflorum Lam) is used worldwide as pasture for animal feed, is considered one of the best pastures to supply the forage shortage during the winter period in the Rio Grande do Sul. Seed production usually occurs in specific areas for this purpose and those submitted to animal grazing, which can result in low physiological quality. The objective of this study was to study the physical and physiological quality of ryegrass seeds from different positions on the ear, harvested with different degrees of physiological maturity and submitted or not to continuous stocking animal grazing for 90 days, as well as to determine the sample size, in a number of plants, for characters morphological and productive. Ryegrass ears were harvested at random, in two areas of 10 hectares each, at 13, 20, 27, 31 and 35 days after 50% of the plants were in anthesis (DAA), is divided into upper, middle and lower thirds, proportional to the size of the ear, in areas with and without animal grazing, considering for the analysis of variance, a factorial 5 x 3 x 2. The seeds were submitted to the germination pattern, length of the aerial part and root, dry mass of seedling and mass of a thousand seeds. Plants were also collected and measured to evaluate morphological and productive traits: plant height, fresh and dry plant mass, number of ears per plant, ear size, number of spikelets per ear and plants per square meter, to perform the dimensioning sample through an iterative process with 2000 resamples with replacement. There was an interaction between the factors for the evaluated characters, with a higher index of germination speed, vigor and mass of a thousand seeds for the middle third of the ear at 27 DAA. The highest averages for seed germination were obtained for the upper and middle thirds at 27 and 31 DAA, in the area without animal grazing. In the grazed area, the highest germination was obtained at 35 DAA, with a delay in maturation in relation to the non-grazed area. The sample size of 306 and 218 plants, for areas with and without animal grazing, respectively, are sufficient to evaluate ryegrass morphological and productive characters. Continuous animal grazing decreases the physiological quality of seeds and the mass of a thousand seeds, occurring physiological maturity between 27 and 31 DAA in the area without animal grazing and between 31 and 35 DAA in the area with animal grazing.
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spelling Qualidade fisiológica de sementes e tamanho de amostra de azevém submetido a manejos de pastejo animalPhysiological quality seeds and sample size in ryegrass submitted to animal pasture managementDimensionamento amostralL. multiflorumPosicionamento na espigaSample sizingLolium multiflorumSpike positioningCNPQ::CIENCIAS AGRARIAS::AGRONOMIARyegrass (Lolium multiflorum Lam) is used worldwide as pasture for animal feed, is considered one of the best pastures to supply the forage shortage during the winter period in the Rio Grande do Sul. Seed production usually occurs in specific areas for this purpose and those submitted to animal grazing, which can result in low physiological quality. The objective of this study was to study the physical and physiological quality of ryegrass seeds from different positions on the ear, harvested with different degrees of physiological maturity and submitted or not to continuous stocking animal grazing for 90 days, as well as to determine the sample size, in a number of plants, for characters morphological and productive. Ryegrass ears were harvested at random, in two areas of 10 hectares each, at 13, 20, 27, 31 and 35 days after 50% of the plants were in anthesis (DAA), is divided into upper, middle and lower thirds, proportional to the size of the ear, in areas with and without animal grazing, considering for the analysis of variance, a factorial 5 x 3 x 2. The seeds were submitted to the germination pattern, length of the aerial part and root, dry mass of seedling and mass of a thousand seeds. Plants were also collected and measured to evaluate morphological and productive traits: plant height, fresh and dry plant mass, number of ears per plant, ear size, number of spikelets per ear and plants per square meter, to perform the dimensioning sample through an iterative process with 2000 resamples with replacement. There was an interaction between the factors for the evaluated characters, with a higher index of germination speed, vigor and mass of a thousand seeds for the middle third of the ear at 27 DAA. The highest averages for seed germination were obtained for the upper and middle thirds at 27 and 31 DAA, in the area without animal grazing. In the grazed area, the highest germination was obtained at 35 DAA, with a delay in maturation in relation to the non-grazed area. The sample size of 306 and 218 plants, for areas with and without animal grazing, respectively, are sufficient to evaluate ryegrass morphological and productive characters. Continuous animal grazing decreases the physiological quality of seeds and the mass of a thousand seeds, occurring physiological maturity between 27 and 31 DAA in the area without animal grazing and between 31 and 35 DAA in the area with animal grazing.Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqO azevém (Lolium multiflorum Lam) é utilizado mundialmente como pastagem para alimentação animal, sendo considerado uma das melhores pastagens para suprir o vazio forrageiro durante o período de inverno no Rio Grande do Sul. A produção de sementes normalmente ocorre em áreas específicas para tal fim e aquelas submetidas ao pastejo animal, o que pode acarretar em baixa qualidade fisiológica. Objetivou-se estudar a qualidade física e fisiológica de sementes de azevém de diferentes posições na espiga, colhidas com diferentes graus de maturidade fisiológica e submetidas ou não ao pastejo animal de lotação contínua por 90 dias, assim como, determinar o tamanho de amostra, em número de plantas, para caracteres morfológicos e produtivos. Foram colhidas espigas de azevém de forma aleatória, em duas áreas de 10 hectares cada, aos 13, 20, 27, 31 e 35 dias após 50% das plantas estarem em antese (DAA), sendo fracionadas em terços superior, médio e inferior, proporcional ao tamanho da espiga, em áreas com e sem pastejo animal, considerando para a análise de variância, um fatorial 5 x 3 x 2. As sementes foram submetidas ao teste padrão de germinação, comprimento da parte aérea e raiz, massa seca de plântula e massa de mil sementes. Também foram coletadas e mensuradas plantas para avaliação de caracteres morfológicos e produtivos: estatura de plantas, fitomassa fresca e seca de plantas, número de espigas por plantas, tamanho de espiga, número de espiguetas por espiga e plantas por m-2, para realizar o dimensionamento amostral por meio de um processo iterativo com 2000 reamostragens com reposição. Observou-se interação entre os fatores para os caracteres avaliados, apresentando maior índice de velocidade de germinação, vigor e massa de mil sementes para o terço médio da espiga aos 27 DAA. As maiores médias para germinação de sementes foram obtidas para os terços superior e médio aos 27 e 31 DAA, na área sem pastejo animal. Na área pastejada, a maior germinação foi obtida aos 35 DAA, observando-se atraso na maturação em relação a área não pastejada. O tamanho de amostra de 306 e 218 plantas, para áreas com e sem pastejo animal, respectivamente, são suficientes para avaliar caracteres morfológicos e produtivo de azevém. O pastejo animal contínuo diminui a qualidade fisiológica de sementes e a massa de mil sementes, ocorrendo maturidade fisiológica entre 27 e 31 DAA na área sem pastejo animal e entre 31 e 35 DAA na área com pastejo animal.Universidade Federal de Santa MariaBrasilAgronomiaUFSMPrograma de Pós-Graduação em AgronomiaCentro de Ciências RuraisLopes, Sidinei Joséhttp://lattes.cnpq.br/7533347017859354Nunes, Ubirajara RussiSoares, André BrugnaraMüller, Caren Alessandra2021-12-07T17:23:28Z2021-12-07T17:23:28Z2020-09-25info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://repositorio.ufsm.br/handle/1/23186ark:/26339/001300000cmk8porAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM2022-06-29T13:53:33Zoai:repositorio.ufsm.br:1/23186Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2022-06-29T13:53:33Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false
dc.title.none.fl_str_mv Qualidade fisiológica de sementes e tamanho de amostra de azevém submetido a manejos de pastejo animal
Physiological quality seeds and sample size in ryegrass submitted to animal pasture management
title Qualidade fisiológica de sementes e tamanho de amostra de azevém submetido a manejos de pastejo animal
spellingShingle Qualidade fisiológica de sementes e tamanho de amostra de azevém submetido a manejos de pastejo animal
Müller, Caren Alessandra
Dimensionamento amostral
L. multiflorum
Posicionamento na espiga
Sample sizing
Lolium multiflorum
Spike positioning
CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
title_short Qualidade fisiológica de sementes e tamanho de amostra de azevém submetido a manejos de pastejo animal
title_full Qualidade fisiológica de sementes e tamanho de amostra de azevém submetido a manejos de pastejo animal
title_fullStr Qualidade fisiológica de sementes e tamanho de amostra de azevém submetido a manejos de pastejo animal
title_full_unstemmed Qualidade fisiológica de sementes e tamanho de amostra de azevém submetido a manejos de pastejo animal
title_sort Qualidade fisiológica de sementes e tamanho de amostra de azevém submetido a manejos de pastejo animal
author Müller, Caren Alessandra
author_facet Müller, Caren Alessandra
author_role author
dc.contributor.none.fl_str_mv Lopes, Sidinei José
http://lattes.cnpq.br/7533347017859354
Nunes, Ubirajara Russi
Soares, André Brugnara
dc.contributor.author.fl_str_mv Müller, Caren Alessandra
dc.subject.por.fl_str_mv Dimensionamento amostral
L. multiflorum
Posicionamento na espiga
Sample sizing
Lolium multiflorum
Spike positioning
CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
topic Dimensionamento amostral
L. multiflorum
Posicionamento na espiga
Sample sizing
Lolium multiflorum
Spike positioning
CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
description Ryegrass (Lolium multiflorum Lam) is used worldwide as pasture for animal feed, is considered one of the best pastures to supply the forage shortage during the winter period in the Rio Grande do Sul. Seed production usually occurs in specific areas for this purpose and those submitted to animal grazing, which can result in low physiological quality. The objective of this study was to study the physical and physiological quality of ryegrass seeds from different positions on the ear, harvested with different degrees of physiological maturity and submitted or not to continuous stocking animal grazing for 90 days, as well as to determine the sample size, in a number of plants, for characters morphological and productive. Ryegrass ears were harvested at random, in two areas of 10 hectares each, at 13, 20, 27, 31 and 35 days after 50% of the plants were in anthesis (DAA), is divided into upper, middle and lower thirds, proportional to the size of the ear, in areas with and without animal grazing, considering for the analysis of variance, a factorial 5 x 3 x 2. The seeds were submitted to the germination pattern, length of the aerial part and root, dry mass of seedling and mass of a thousand seeds. Plants were also collected and measured to evaluate morphological and productive traits: plant height, fresh and dry plant mass, number of ears per plant, ear size, number of spikelets per ear and plants per square meter, to perform the dimensioning sample through an iterative process with 2000 resamples with replacement. There was an interaction between the factors for the evaluated characters, with a higher index of germination speed, vigor and mass of a thousand seeds for the middle third of the ear at 27 DAA. The highest averages for seed germination were obtained for the upper and middle thirds at 27 and 31 DAA, in the area without animal grazing. In the grazed area, the highest germination was obtained at 35 DAA, with a delay in maturation in relation to the non-grazed area. The sample size of 306 and 218 plants, for areas with and without animal grazing, respectively, are sufficient to evaluate ryegrass morphological and productive characters. Continuous animal grazing decreases the physiological quality of seeds and the mass of a thousand seeds, occurring physiological maturity between 27 and 31 DAA in the area without animal grazing and between 31 and 35 DAA in the area with animal grazing.
publishDate 2020
dc.date.none.fl_str_mv 2020-09-25
2021-12-07T17:23:28Z
2021-12-07T17:23:28Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://repositorio.ufsm.br/handle/1/23186
dc.identifier.dark.fl_str_mv ark:/26339/001300000cmk8
url http://repositorio.ufsm.br/handle/1/23186
identifier_str_mv ark:/26339/001300000cmk8
dc.language.iso.fl_str_mv por
language por
dc.rights.driver.fl_str_mv Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal de Santa Maria
Brasil
Agronomia
UFSM
Programa de Pós-Graduação em Agronomia
Centro de Ciências Rurais
publisher.none.fl_str_mv Universidade Federal de Santa Maria
Brasil
Agronomia
UFSM
Programa de Pós-Graduação em Agronomia
Centro de Ciências Rurais
dc.source.none.fl_str_mv reponame:Manancial - Repositório Digital da UFSM
instname:Universidade Federal de Santa Maria (UFSM)
instacron:UFSM
instname_str Universidade Federal de Santa Maria (UFSM)
instacron_str UFSM
institution UFSM
reponame_str Manancial - Repositório Digital da UFSM
collection Manancial - Repositório Digital da UFSM
repository.name.fl_str_mv Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)
repository.mail.fl_str_mv atendimento.sib@ufsm.br||tedebc@gmail.com
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