Spittlebug eggs: comparison of sampling efficiency of sample units of different sizes
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , |
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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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 |
_version_ |
1793416706089025536 |