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Registro Completo |
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
13/05/1998 |
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Data da última atualização: |
13/05/1998 |
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Autoria: |
NILAKHE, S. S.; PASCHOAL, G. O.; SILVA, A. A. da; BUAINAIN, C. M.; SOUZA, A. R. R. |
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Afiliação: |
CNPGC. |
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Título: |
Spittlebug eggs: comparasion of sampling efficiency of sample units of different sizes. |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
Pesquisa Agropecuaria Brasileira, Brasilia, v.20, n.11, p.1245-1250, nov. 1985. |
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Idioma: |
Inglês |
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Conteúdo: |
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 75 cm2 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, of 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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Thesagro: |
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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Marc: |
LEADER 01560naa a2200241 a 4500
001 1104624
005 1998-05-13
008 1985 bl uuuu u00u1 u #d
100 1 $aNILAKHE, S. S.
245 $aSpittlebug eggs$bcomparasion of sampling efficiency of sample units of different sizes.
260 $c1985
520 $aThe 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 75 cm2 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, of plots within blocks were significant only in about 20% instances. Nevertheless, choosing of well-distributed sampling sites within the sampling area was suggested.
650 $aCercopidae
650 $apastures
650 $aBrachiaria Decumbens
650 $aDeois Flavopicta
650 $aPastagem
650 $aZulia Entreriana
700 1 $aPASCHOAL, G. O.
700 1 $aSILVA, A. A. da
700 1 $aBUAINAIN, C. M.
700 1 $aSOUZA, A. R. R.
773 $tPesquisa Agropecuaria Brasileira, Brasilia$gv.20, n.11, p.1245-1250, nov. 1985.
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Embrapa Unidades Centrais (AI-SEDE) |
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