Spittlebug eggs: comparison of sampling efficiency of sample units of different sizes

Detalhes bibliográficos
Autor(a) principal: Nilakhe, Shashank S.
Data de Publicação: 2014
Outros Autores: Paschoal, Gustavo O., Silva, Alcir A. da, Buainain, Conceição M., Souza, Antonia R. R.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/16327
Resumo: The sampling efficiency of three sample units was compared to determine spittlebug egg densities in pastures of Brachiaria decumbens Stapf. To obtain the same level of precision, the total pasture area to be examined increased by 1.5 times when size of the sample unit was increased from 75 to 150 cm2, and by 2.5 times when it was increased to 225 cm2 . Using the 75cm2 unit, the number of samples necessary for 10%, 15% and 20% levels of precision were estimated to be 170, 82 and 48, respectively. The distribution pattern of egg counts per 75 cm2 of the pasture, fitted the negative binomial series. A study of sampling variation within 1 ha pastures, showed that differences between blocks, or plots within blocks were significant only in about 20% instances. Nevertheless, choosing of well-distributed sampling sites within the sampling area was suggested.
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spelling Spittlebug eggs: comparison of sampling efficiency of sample units of different sizesOvos de cigarrinhas-das-pastagens: comparação de eficiência de amostragem em relação ao tamanho das amostraszulia entreriana; deois flavopicta; cercopidae; brachiaria decumbens; pasturezulia entreriana; deois flavopicta; cercopidae;brachiaria decumbens; pastagemThe sampling efficiency of three sample units was compared to determine spittlebug egg densities in pastures of Brachiaria decumbens Stapf. To obtain the same level of precision, the total pasture area to be examined increased by 1.5 times when size of the sample unit was increased from 75 to 150 cm2, and by 2.5 times when it was increased to 225 cm2 . Using the 75cm2 unit, the number of samples necessary for 10%, 15% and 20% levels of precision were estimated to be 170, 82 and 48, respectively. The distribution pattern of egg counts per 75 cm2 of the pasture, fitted the negative binomial series. A study of sampling variation within 1 ha pastures, showed that differences between blocks, or plots within blocks were significant only in about 20% instances. Nevertheless, choosing of well-distributed sampling sites within the sampling area was suggested.Foram comparados três diferentes tamanhos de amostras em relação à eficiência da amostragem para se determinar a densidade de ovos de cigarrinhas em pastagens de Brachiaria decumbens Stapf. Para se obter um mesmo nível de precisão, a área de pastagem a ser examinada aumentou 1,5 vez quando o tamanho da unidade de amostragem aumentou de 75 para 150cm2 e de 2,4 vezes quando o aumento foi para 225cm2. Uma estimativa mostrou a necessidade de 170 amostras para se obter um nível de 10% de precisão, 82 para 15% e 48 para 20%. O número de ovos por unidade de 75cm2 de área de pastagem mostrou uma distribuição do tipo binomial negativa. Um estudo sobre a variação na amostragem nas áreas de 1 ha de pastagens mostrou que as diferenças entre os blocos, ou parcelas dentro dos blocos, foram significativas somente em cerca de 20% dos casos. Contudo, tomada de amostras bem distribuídas dentro da área de amostragem foi sugerida.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraNilakhe, Shashank S.Paschoal, Gustavo O.Silva, Alcir A. daBuainain, Conceição M.Souza, Antonia R. R.2014-04-16info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/16327Pesquisa Agropecuaria Brasileira; v.20, n.11, nov. 1985; 1245-1250Pesquisa Agropecuária Brasileira; v.20, n.11, nov. 1985; 1245-12501678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAenghttps://seer.sct.embrapa.br/index.php/pab/article/view/16327/10541info:eu-repo/semantics/openAccess2014-04-16T19:38:12Zoai:ojs.seer.sct.embrapa.br:article/16327Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-04-16T19:38:12Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Spittlebug eggs: comparison of sampling efficiency of sample units of different sizes
Ovos de cigarrinhas-das-pastagens: comparação de eficiência de amostragem em relação ao tamanho das amostras
title Spittlebug eggs: comparison of sampling efficiency of sample units of different sizes
spellingShingle Spittlebug eggs: comparison of sampling efficiency of sample units of different sizes
Nilakhe, Shashank S.
zulia entreriana; deois flavopicta; cercopidae; brachiaria decumbens; pasture
zulia entreriana; deois flavopicta; cercopidae;brachiaria decumbens; pastagem
title_short Spittlebug eggs: comparison of sampling efficiency of sample units of different sizes
title_full Spittlebug eggs: comparison of sampling efficiency of sample units of different sizes
title_fullStr Spittlebug eggs: comparison of sampling efficiency of sample units of different sizes
title_full_unstemmed Spittlebug eggs: comparison of sampling efficiency of sample units of different sizes
title_sort Spittlebug eggs: comparison of sampling efficiency of sample units of different sizes
author Nilakhe, Shashank S.
author_facet Nilakhe, Shashank S.
Paschoal, Gustavo O.
Silva, Alcir A. da
Buainain, Conceição M.
Souza, Antonia R. R.
author_role author
author2 Paschoal, Gustavo O.
Silva, Alcir A. da
Buainain, Conceição M.
Souza, Antonia R. R.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Nilakhe, Shashank S.
Paschoal, Gustavo O.
Silva, Alcir A. da
Buainain, Conceição M.
Souza, Antonia R. R.
dc.subject.por.fl_str_mv zulia entreriana; deois flavopicta; cercopidae; brachiaria decumbens; pasture
zulia entreriana; deois flavopicta; cercopidae;brachiaria decumbens; pastagem
topic zulia entreriana; deois flavopicta; cercopidae; brachiaria decumbens; pasture
zulia entreriana; deois flavopicta; cercopidae;brachiaria decumbens; pastagem
description The sampling efficiency of three sample units was compared to determine spittlebug egg densities in pastures of Brachiaria decumbens Stapf. To obtain the same level of precision, the total pasture area to be examined increased by 1.5 times when size of the sample unit was increased from 75 to 150 cm2, and by 2.5 times when it was increased to 225 cm2 . Using the 75cm2 unit, the number of samples necessary for 10%, 15% and 20% levels of precision were estimated to be 170, 82 and 48, respectively. The distribution pattern of egg counts per 75 cm2 of the pasture, fitted the negative binomial series. A study of sampling variation within 1 ha pastures, showed that differences between blocks, or plots within blocks were significant only in about 20% instances. Nevertheless, choosing of well-distributed sampling sites within the sampling area was suggested.
publishDate 2014
dc.date.none.fl_str_mv 2014-04-16
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/16327
url https://seer.sct.embrapa.br/index.php/pab/article/view/16327
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/16327/10541
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.20, n.11, nov. 1985; 1245-1250
Pesquisa Agropecuária Brasileira; v.20, n.11, nov. 1985; 1245-1250
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Agropecuária Brasileira (Online)
collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pab@sct.embrapa.br || sct.pab@embrapa.br
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