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| Registros recuperados : 185 | |
| Registros recuperados : 185 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
25/03/2002 |
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Data da última atualização: |
31/03/2017 |
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Autoria: |
NILAKHE, S. S.; PASCHOAL, G. O.; SILVA, A. A. da; CORINI, P. S. |
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Título: |
Sampling efficiency of different sample units and procedures to sample spittlebug eggs. |
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Ano de publicação: |
1988 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF. v. 23, n. 3, p. 213-218, mar. 1988. |
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Idioma: |
Inglês |
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Conteúdo: |
A sampling study of spittlebug eggs in pastures of Brachiaria decumbens Stapf was conducted by using samples of 25, 50 and 75 cm2 of the pasture. The sampling efficiency of three sample units was compared by calculating the number of samples necessary to obtain a certain level of precision (proportion of standard error to mean expressed as a percentage). The sampling efficiency of 50 cm2 sample unit was poor in comparsion to 25 and 75 cm2. To obtain the same level of precision e.g., 20%, the total pasture area to be examined was slightly smaller for 75 cm2 unit than for 25 cm2 at lower egg density (1/25 cm2); however, such advantage of the 75 cm disappeared at egg density of 4/25 cm2. Based on theis finding and the fact that fewer samples would be taken inthe case of 75 cm than the 25 cm2 unit, the use of fomer was suggested. The distribution pattern of number of eggs per 25 or 50 cm2 of pature fitted the negative binomial series. |
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Palavras-Chave: |
pasture. |
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Thesagro: |
Brachiaria; Brachiaria Decumbens; Deois flavopicta; Pastagem; Zulia entreriana. |
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Thesaurus NAL: |
Cercopidae; Pastures. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/158383/1/Samppling-efficiency-of-different.pdf
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Marc: |
LEADER 01667naa a2200253 a 4500
001 1106690
005 2017-03-31
008 1988 bl uuuu u00u1 u #d
100 1 $aNILAKHE, S. S.
245 $aSampling efficiency of different sample units and procedures to sample spittlebug eggs.
260 $c1988
520 $aA sampling study of spittlebug eggs in pastures of Brachiaria decumbens Stapf was conducted by using samples of 25, 50 and 75 cm2 of the pasture. The sampling efficiency of three sample units was compared by calculating the number of samples necessary to obtain a certain level of precision (proportion of standard error to mean expressed as a percentage). The sampling efficiency of 50 cm2 sample unit was poor in comparsion to 25 and 75 cm2. To obtain the same level of precision e.g., 20%, the total pasture area to be examined was slightly smaller for 75 cm2 unit than for 25 cm2 at lower egg density (1/25 cm2); however, such advantage of the 75 cm disappeared at egg density of 4/25 cm2. Based on theis finding and the fact that fewer samples would be taken inthe case of 75 cm than the 25 cm2 unit, the use of fomer was suggested. The distribution pattern of number of eggs per 25 or 50 cm2 of pature fitted the negative binomial series.
650 $aCercopidae
650 $aPastures
650 $aBrachiaria
650 $aBrachiaria Decumbens
650 $aDeois flavopicta
650 $aPastagem
650 $aZulia entreriana
653 $apasture
700 1 $aPASCHOAL, G. O.
700 1 $aSILVA, A. A. da
700 1 $aCORINI, P. S.
773 $tPesquisa Agropecuária Brasileira, Brasília, DF.$gv. 23, n. 3, p. 213-218, mar. 1988.
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Registro original: |
Embrapa Unidades Centrais (AI-SEDE) |
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