Data/hora: 21/06/2024 11:10:10

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 25/03/2002
Data da última atualização: | 31/03/2017
Autoria: | NILAKHE, S. S.; PASCHOAL, G. O.; SILVA, A. A. da; CORINI, P. S.
Título: | Sampling efficiency of different sample units and procedures to sample spittlebug eggs.
Ano de publicação: | 1988
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF. v. 23, n. 3, p. 213-218, mar. 1988.
Idioma: | Inglês
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.
Palavras-Chave: | pasture.
Thesagro: | Brachiaria; Brachiaria Decumbens; Deois flavopicta; Pastagem; Zulia entreriana.
Thesaurus Nal: | Cercopidae; Pastures.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/158383/1/Samppling-efficiency-of-different.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (21752-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS