| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Amazônia Ocidental; Embrapa Mandioca e Fruticultura. |
|
Data corrente: |
27/04/2000 |
|
Data da última atualização: |
27/04/2000 |
|
Autoria: |
HATHEWAY, W. H.; WILLIAMS, E. J. |
|
Afiliação: |
Rockefeller Foundation, Agricultural Field Staff, and the Institute of Statistics Raleigh, North Carolina, U.S.A. |
|
Título: |
Efficient estimation of the relationship between plot size and the variability of crop yields. |
|
Ano de publicação: |
1958 |
|
Fonte/Imprenta: |
Biometrics, p.207-222, 1958. |
|
Idioma: |
Inglês |
|
Conteúdo: |
The optimum size of plot in field experimentation depends on the relationship between fixed costs and costs varying with number of units, and on soil variability. Perhaps the most useful measure of soil hetero geneity yet devised is that of Smith [1938], who showed empirically that the logarithm of the variance between plots of a given size was linearly related to the logarithm of the size of the plot. In the presentpaper we consider only the relationship between size and variability. The objects of the paper are, firstly, to show efficient estimates of the constants in this relationship may be determined, and secondly, to illustrate a general method of determining efficient linear estimates when the data are, as in the present instance, correlated and of unequal variability. |
|
Palavras-Chave: |
Culturas. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 01191naa a2200145 a 4500
001 1648770
005 2000-04-27
008 1958 bl --- 0-- u #d
100 1 $aHATHEWAY, W. H.
245 $aEfficient estimation of the relationship between plot size and the variability of crop yields.
260 $c1958
520 $aThe optimum size of plot in field experimentation depends on the relationship between fixed costs and costs varying with number of units, and on soil variability. Perhaps the most useful measure of soil hetero geneity yet devised is that of Smith [1938], who showed empirically that the logarithm of the variance between plots of a given size was linearly related to the logarithm of the size of the plot. In the presentpaper we consider only the relationship between size and variability. The objects of the paper are, firstly, to show efficient estimates of the constants in this relationship may be determined, and secondly, to illustrate a general method of determining efficient linear estimates when the data are, as in the present instance, correlated and of unequal variability.
653 $aCulturas
700 1 $aWILLIAMS, E. J.
773 $tBiometrics, p.207-222, 1958.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
Registro Completo
|
Biblioteca(s): |
Embrapa Algodão. |
|
Data corrente: |
15/03/2016 |
|
Data da última atualização: |
15/03/2016 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
A - 1 |
|
Autoria: |
FERNANDES, F. S.; RAMALHO, F. de S.; MALAQUIAS, J. B.; GODOY, W. A. C.; SANTOS, B. D. B. |
|
Afiliação: |
FRANCISCO SALES FERNANDES, USP/ESALQ; FRANCISCO DE SOUZA RAMALHO, CNPA; JOSE BRUNO MALAQUIAS, CNPA; WESLEY AUGUSTO CONDE GODOY, USP/ESALQ; BÁRBARA DAVIS BRITO SANTOS, BOLSISTA DO CNPq. |
|
Título: |
Interspecific associations between cycloneda sanguinea and two aphid species (Aphis gossypii and Hyadaphis foeniculi) in Sole-crop and fennel-cotton intercropping systems. |
|
Ano de publicação: |
2015 |
|
Fonte/Imprenta: |
Plos One, v. 10, n.8, Aug. 2015. |
|
Idioma: |
Inglês |
|
Conteúdo: |
Aphids cause significant damage to crop plants. Studies regarding predator-prey relationships in fennel (Foeniculum vulgare Mill.) and cotton (Gossypium hirsutum L.) crops are important for understanding essential ecological interactions in the context of intercropping and for establishing pest management programs for aphids. This study evaluated the association among Hyadaphis foeniculi (Passerini) (Hemiptera: Aphididae), Aphis gossypii Glover (Hemiptera: Aphididae) and Cycloneda sanguinea (L.) (Coleoptera: Coccinellidae) in cotton with coloured fibres, fennel and cotton intercropped with fennel. Association analysis was used to investigate whether the presence or absence of prey and predator species can indicate possible interactions between aphids and ladybugs. Significant associations among both apterous and alate H. foeniculi and C. sanguinea were observed in both the fennel and fennel-cotton intercropping systems. The similarity analysis showed that the presence of aphids and ladybugs in the same system is significantly dependent on the type of crop. A substantial amount of evidence indicates that the presence of the ladybug C. sanguinea, is associated with apterous or alate A. gossypii and H. foeniculi in fennel-cotton intercropping system. We recommend that future research vising integrated aphid management taking into account these associations for take decisions. |
|
Palavras-Chave: |
Gossypium hirsutum L; Hyadaphis foeniculi. |
|
Thesagro: |
Aphis gossypii; Cycloneda sanguinea; Foeniculum vulgare. |
|
Thesaurus NAL: |
cotton. |
|
Categoria do assunto: |
-- |
|
URL: |
https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/1041018/1/Interspecificassociationsbetweencyclonedasanguinea....pdf
|
|
Marc: |
LEADER 02178naa a2200241 a 4500
001 2041018
005 2016-03-15
008 2015 bl uuuu u00u1 u #d
100 1 $aFERNANDES, F. S.
245 $aInterspecific associations between cycloneda sanguinea and two aphid species (Aphis gossypii and Hyadaphis foeniculi) in Sole-crop and fennel-cotton intercropping systems.$h[electronic resource]
260 $c2015
520 $aAphids cause significant damage to crop plants. Studies regarding predator-prey relationships in fennel (Foeniculum vulgare Mill.) and cotton (Gossypium hirsutum L.) crops are important for understanding essential ecological interactions in the context of intercropping and for establishing pest management programs for aphids. This study evaluated the association among Hyadaphis foeniculi (Passerini) (Hemiptera: Aphididae), Aphis gossypii Glover (Hemiptera: Aphididae) and Cycloneda sanguinea (L.) (Coleoptera: Coccinellidae) in cotton with coloured fibres, fennel and cotton intercropped with fennel. Association analysis was used to investigate whether the presence or absence of prey and predator species can indicate possible interactions between aphids and ladybugs. Significant associations among both apterous and alate H. foeniculi and C. sanguinea were observed in both the fennel and fennel-cotton intercropping systems. The similarity analysis showed that the presence of aphids and ladybugs in the same system is significantly dependent on the type of crop. A substantial amount of evidence indicates that the presence of the ladybug C. sanguinea, is associated with apterous or alate A. gossypii and H. foeniculi in fennel-cotton intercropping system. We recommend that future research vising integrated aphid management taking into account these associations for take decisions.
650 $acotton
650 $aAphis gossypii
650 $aCycloneda sanguinea
650 $aFoeniculum vulgare
653 $aGossypium hirsutum L
653 $aHyadaphis foeniculi
700 1 $aRAMALHO, F. de S.
700 1 $aMALAQUIAS, J. B.
700 1 $aGODOY, W. A. C.
700 1 $aSANTOS, B. D. B.
773 $tPlos One$gv. 10, n.8, Aug. 2015.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Algodão (CNPA) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
