MORFOLOGIC CHARACTERIZATION ON MARANDU GRASS PASTURES SUBMITTED TO DEFOLIATION FREQUENCIES AND FERTILIZATION LEVELS
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Ciência animal brasileira (Online) |
Texto Completo: | https://revistas.ufg.br/vet/article/view/e-40460 |
Resumo: | Tillers are the basic units of growth in forage grasses and tillering is responsible for the adaptation and reestablishment of grass after defoliation. Therefore, it is important to understand the morphological changes of tillers due to defoliation environment and fertilization, which are two important pasture management strategies. In this study, we aimed to characterize the morfologic response of marandu grass tillers before nitrogen fertilization and frequency of defoliation for a better understanding of the phenotypic plasticity of this plant. This study was carried out in two experimental years. The treatments in the first year consisted of different cutting intervals (7, 14, 28, 56, and 112 days). In the second year, besides the same cutting intervals, two fertilization conditions were studied: a low level (21.5 kg.ha-1 P and 75 kg.ha-1 N) and a high level (43 kg.ha-1 P and 300 kg.ha-1N). A randomized block design was adopted and in experiment two a factorial scheme with four repetitions was used. In both experiments the responses to stem length, leaf blade length, space between leaf blade and leaf area, and weight of tiller increased with cutting intervals. In experiment two, high doses of fertilization provided larger number of vegetative tillers, space between leaf blades, tiller weight, longer leaves and stems, and higher population densities of reproductive tillers with longer cutting intervals. In conclusion, the defoliation and the nitrogen and phosphorous fertilization produced morphologic modifications in marandu grass tillers suggesting the phenotypic plasticity of this grass. Keywords: cutting interval; nitrogen; phosphorous; Urochloa brizantha. |
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MORFOLOGIC CHARACTERIZATION ON MARANDU GRASS PASTURES SUBMITTED TO DEFOLIATION FREQUENCIES AND FERTILIZATION LEVELSCARACTERIZAÇÃO MORFOLÓGICA EM PASTOS DE CAPIM-MARANDU SUBMETIDOS A FREQUÊNCIAS DE DESFOLHAÇÃO E NÍVEIS DE ADUBAÇÃOAnimal NutritionBrachiaria brizanthadesfolhaçãofósforonitrogênioUrochloa brizantha.Tillers are the basic units of growth in forage grasses and tillering is responsible for the adaptation and reestablishment of grass after defoliation. Therefore, it is important to understand the morphological changes of tillers due to defoliation environment and fertilization, which are two important pasture management strategies. In this study, we aimed to characterize the morfologic response of marandu grass tillers before nitrogen fertilization and frequency of defoliation for a better understanding of the phenotypic plasticity of this plant. This study was carried out in two experimental years. The treatments in the first year consisted of different cutting intervals (7, 14, 28, 56, and 112 days). In the second year, besides the same cutting intervals, two fertilization conditions were studied: a low level (21.5 kg.ha-1 P and 75 kg.ha-1 N) and a high level (43 kg.ha-1 P and 300 kg.ha-1N). A randomized block design was adopted and in experiment two a factorial scheme with four repetitions was used. In both experiments the responses to stem length, leaf blade length, space between leaf blade and leaf area, and weight of tiller increased with cutting intervals. In experiment two, high doses of fertilization provided larger number of vegetative tillers, space between leaf blades, tiller weight, longer leaves and stems, and higher population densities of reproductive tillers with longer cutting intervals. In conclusion, the defoliation and the nitrogen and phosphorous fertilization produced morphologic modifications in marandu grass tillers suggesting the phenotypic plasticity of this grass. Keywords: cutting interval; nitrogen; phosphorous; Urochloa brizantha.Os perfilhos são as unidades básicas de crescimento das gramíneas forrageiras e o perfilhamento é responsável pela adaptação e reestabelecimento da gramínea após a desfolhação. Portanto, é importante conhecer as modificações morfológicas dos perfilhos em função do ambiente de desfolhação e da adubação, duas importantes estratégias de manejo das pastagens. Assim, objetivou-se com este trabalho caracterizar as respostas morfológicas dos perfilhos do capim-marandu, em resposta à adubação e à frequência de desfolhação, para melhor compreensão da plasticidade fenotípica dessa planta. O trabalho foi realizado em dois anos experimentais, em que foram avaliados distintos intervalos de corte (sete, 14, 28, 56 e 112 dias), utilizando-se o delineamento em blocos casualizados, com quatro repetições. No segundo ano, além dos mesmos intervalos de corte avaliados no primeiro ano, também foram estudadas duas condições de adubação, sendo uma baixa (21,5 kg.ha-1 de P e 75 kg.ha-1 de N) e outra alta (43 kg.ha-1 de P e 300 kg.ha-1 de N). No segundo ano, utilizou-se o esquema fatorial. Em ambos os anos, as respostas para comprimento de colmo, comprimento da lâmina foliar, espaço entre as lâminas foliares e área foliar e peso do perfilho foram crescentes com o intervalo de corte. No segundo ano, a alta dose de adubos proporcionou maior número de perfilhos vegetativos, espaço entre lâminas foliares, área foliar, peso de perfilhos, folhas e colmos mais compridos, em comparação à baixa dose de adubos. No segundo ano, houve maior densidade populacional de perfilho reprodutivo com o maior intervalo de corte. A desfolhação e a adubação nitrogenada e fosfatada causam modificações morfológicas nos perfilhos do capim-marandu, indicando a ampla plasticidade fenotípica desta gramínea. Palavras-chave: fósforo; intervalo de corte; nitrogênio; Urochloa brizantha. Universidade Federal de Goiás2017-03-31info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionPesquisa CientíficaResearchapplication/pdftext/htmlhttps://revistas.ufg.br/vet/article/view/e-4046010.1590/cab18040460Brazilian Animal Science/ Ciência Animal Brasileira; Vol. 18 (2017): Continuous publicationCiência Animal Brasileira / Brazilian Animal Science; v. 18 (2017): Publicação contínua1809-68911518-2797reponame:Ciência animal brasileira (Online)instname:Universidade Federal de Goiás (UFG)instacron:UFGporhttps://revistas.ufg.br/vet/article/view/e-40460/22685https://revistas.ufg.br/vet/article/view/e-40460/22686Copyright (c) 2017 Ciência Animal Brasileirainfo:eu-repo/semantics/openAccessMedica, Jéssica Abreu de SáReis, Natani SilvaSantos, Manoel Eduardo Rozalino2023-06-07T18:48:26Zoai:ojs.revistas.ufg.br:article/40460Revistahttps://revistas.ufg.br/vetPUBhttps://revistas.ufg.br/vet/oai||revistacab@gmail.com1809-68911518-2797opendoar:2024-05-21T19:56:13.838156Ciência animal brasileira (Online) - Universidade Federal de Goiás (UFG)true |
dc.title.none.fl_str_mv |
MORFOLOGIC CHARACTERIZATION ON MARANDU GRASS PASTURES SUBMITTED TO DEFOLIATION FREQUENCIES AND FERTILIZATION LEVELS CARACTERIZAÇÃO MORFOLÓGICA EM PASTOS DE CAPIM-MARANDU SUBMETIDOS A FREQUÊNCIAS DE DESFOLHAÇÃO E NÍVEIS DE ADUBAÇÃO |
title |
MORFOLOGIC CHARACTERIZATION ON MARANDU GRASS PASTURES SUBMITTED TO DEFOLIATION FREQUENCIES AND FERTILIZATION LEVELS |
spellingShingle |
MORFOLOGIC CHARACTERIZATION ON MARANDU GRASS PASTURES SUBMITTED TO DEFOLIATION FREQUENCIES AND FERTILIZATION LEVELS Medica, Jéssica Abreu de Sá Animal Nutrition Brachiaria brizantha desfolhação fósforo nitrogênio Urochloa brizantha. |
title_short |
MORFOLOGIC CHARACTERIZATION ON MARANDU GRASS PASTURES SUBMITTED TO DEFOLIATION FREQUENCIES AND FERTILIZATION LEVELS |
title_full |
MORFOLOGIC CHARACTERIZATION ON MARANDU GRASS PASTURES SUBMITTED TO DEFOLIATION FREQUENCIES AND FERTILIZATION LEVELS |
title_fullStr |
MORFOLOGIC CHARACTERIZATION ON MARANDU GRASS PASTURES SUBMITTED TO DEFOLIATION FREQUENCIES AND FERTILIZATION LEVELS |
title_full_unstemmed |
MORFOLOGIC CHARACTERIZATION ON MARANDU GRASS PASTURES SUBMITTED TO DEFOLIATION FREQUENCIES AND FERTILIZATION LEVELS |
title_sort |
MORFOLOGIC CHARACTERIZATION ON MARANDU GRASS PASTURES SUBMITTED TO DEFOLIATION FREQUENCIES AND FERTILIZATION LEVELS |
author |
Medica, Jéssica Abreu de Sá |
author_facet |
Medica, Jéssica Abreu de Sá Reis, Natani Silva Santos, Manoel Eduardo Rozalino |
author_role |
author |
author2 |
Reis, Natani Silva Santos, Manoel Eduardo Rozalino |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Medica, Jéssica Abreu de Sá Reis, Natani Silva Santos, Manoel Eduardo Rozalino |
dc.subject.por.fl_str_mv |
Animal Nutrition Brachiaria brizantha desfolhação fósforo nitrogênio Urochloa brizantha. |
topic |
Animal Nutrition Brachiaria brizantha desfolhação fósforo nitrogênio Urochloa brizantha. |
description |
Tillers are the basic units of growth in forage grasses and tillering is responsible for the adaptation and reestablishment of grass after defoliation. Therefore, it is important to understand the morphological changes of tillers due to defoliation environment and fertilization, which are two important pasture management strategies. In this study, we aimed to characterize the morfologic response of marandu grass tillers before nitrogen fertilization and frequency of defoliation for a better understanding of the phenotypic plasticity of this plant. This study was carried out in two experimental years. The treatments in the first year consisted of different cutting intervals (7, 14, 28, 56, and 112 days). In the second year, besides the same cutting intervals, two fertilization conditions were studied: a low level (21.5 kg.ha-1 P and 75 kg.ha-1 N) and a high level (43 kg.ha-1 P and 300 kg.ha-1N). A randomized block design was adopted and in experiment two a factorial scheme with four repetitions was used. In both experiments the responses to stem length, leaf blade length, space between leaf blade and leaf area, and weight of tiller increased with cutting intervals. In experiment two, high doses of fertilization provided larger number of vegetative tillers, space between leaf blades, tiller weight, longer leaves and stems, and higher population densities of reproductive tillers with longer cutting intervals. In conclusion, the defoliation and the nitrogen and phosphorous fertilization produced morphologic modifications in marandu grass tillers suggesting the phenotypic plasticity of this grass. Keywords: cutting interval; nitrogen; phosphorous; Urochloa brizantha. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-03-31 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Pesquisa Científica Research |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://revistas.ufg.br/vet/article/view/e-40460 10.1590/cab18040460 |
url |
https://revistas.ufg.br/vet/article/view/e-40460 |
identifier_str_mv |
10.1590/cab18040460 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://revistas.ufg.br/vet/article/view/e-40460/22685 https://revistas.ufg.br/vet/article/view/e-40460/22686 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2017 Ciência Animal Brasileira info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2017 Ciência Animal Brasileira |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf text/html |
dc.publisher.none.fl_str_mv |
Universidade Federal de Goiás |
publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.source.none.fl_str_mv |
Brazilian Animal Science/ Ciência Animal Brasileira; Vol. 18 (2017): Continuous publication Ciência Animal Brasileira / Brazilian Animal Science; v. 18 (2017): Publicação contínua 1809-6891 1518-2797 reponame:Ciência animal brasileira (Online) instname:Universidade Federal de Goiás (UFG) instacron:UFG |
instname_str |
Universidade Federal de Goiás (UFG) |
instacron_str |
UFG |
institution |
UFG |
reponame_str |
Ciência animal brasileira (Online) |
collection |
Ciência animal brasileira (Online) |
repository.name.fl_str_mv |
Ciência animal brasileira (Online) - Universidade Federal de Goiás (UFG) |
repository.mail.fl_str_mv |
||revistacab@gmail.com |
_version_ |
1799874789221859328 |