Data/hora: 09/06/2024 04:26:25

Provedor de dados: | Ciência Rural
País: | Brazil
Título: | Sample size for estimating average trunk diameter and plant height in eucalyptus hybrids
Autores: | Cargnelutti Filho,Alberto; Beltrame,Rafael; Bisognin,Dilson Antônio; Lazarotto,Marília; Haselein,Clovis Roberto; Gatto,Darci Alberto; Santos,Gleison Augusto dos.
Data: | 2016-07-01
Ano: | 2016
Palavras-chave: | Eucalyptus spp.; Number of plants; Sample size; Experimental planning.
Resumo: | ABSTRACT: In eucalyptus crops, it is important to determine the number of plants that need to be evaluated for a reliable inference of growth. The aim of this study was to determine the sample size needed to estimate average trunk diameter at breast height and plant height of inter-specific eucalyptus hybrids. In 6,694 plants of twelve inter-specific hybrids it was evaluated trunk diameter at breast height at three (DBH3) and seven years (DBH7) and tree height at seven years (H7) of age. The statistics: minimum, maximum, mean, variance, standard deviation, standard error, and coefficient of variation were calculated. The hypothesis of variance homogeneity was tested. The sample size was determined by re sampling with replacement of 10,000 re samples. There was an increase in the sample size from DBH3 to H7 and DBH7. A sample size of 16, 59 and 31 plants is adequate to estimate DBH3, DBH7 and H7 means, respectively, of inter-specific hybrids of eucalyptus, with amplitude of confidence interval of 95% equal to 20% of the estimated mean.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000701192
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/0103-8478cr20140836
Formato: | text/html
Fonte: | Ciência Rural  v.46 n.7 2016
Fonte: | info:eu-repo/semantics/openAccess