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| Araújo,Márcio José de; Dias,Donizete da Costa; Scarpinati,Edimar Aparecido; Paula,Rinaldo Cesar de. |
| Resumo:O objetivo deste trabalho foi determinar o número de repetições, de plantas por parcela e de medições necessário para avaliação de caracteres de crescimento em testes clonais de eucalipto (Eucalyptus spp.). Foram avaliados dados de altura, diâmetro à altura do peito e volume de madeira, em três testes clonais, realizados em delineamento de blocos ao acaso, com 30 (testes 1 e 2) e 10 clones (teste 3), com seis repetições de seis (teste 1) e de 10 (testes 2 e 3) plantas. As avaliações foram realizadas dos 14 aos 74 meses de idade. Foram estimados os coeficientes de repetibilidade e de determinação, bem como os efeitos do acréscimo na frequência das medições sobre a eficiência seletiva. O volume de madeira é a característica com maior variabilidade na... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eucalyptus; Correlação intraclasse; Eficiência seletiva; Híbrido Urograndis; Modelos mistos; Repetibilidade. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015001000923 |
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| Pavan,Bruno Ettore; Paula,Rinaldo César de; Perecin,Dilermando; Scarpinati,Edimar Aparecido; Candido,Liliam Silvia. |
| The objetive of this work was to evaluate the influence of intergenotypic competition in open-pollinated families of Eucalyptus and its effects on early selection efficiency. Two experiments were carried out, in which the timber volume was evaluated at three ages, in a randomized complete block design. Data from the three years of evaluation (experiment 1, at 2, 4, and 7 years; and experiment 2, at 2, 5, and 7 years) were analyzed using mixed models. The following were estimated: variance components, genetic parameters, selection gains, effective number, early selection efficiency, selection gain per unit time, and coincidence of selection with and without the use of competition covariates. Competition effect was nonsignificant for ages under three years,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eucalyptus; Intergenotypic competition; Progeny tests; Selection methods. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014000600483 |
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| Pavan,Bruno Ettore; Paula,Rinaldo César de; Perecin,Dilermando; Candido,Liliam Silvia; Scarpinati,Edimar Aparecido. |
| The effect of competition is an important source of variation in breeding experiments. This study aimed to compare the selection of plants of open-pollinated families of Eucalyptus with and without the use of competition covariables. Genetic values were determined for each family and tree and for the traits height, diameter at breast height and timber volume in a randomized block design, resulting in the variance components, genetic parameters, selection gains, effective size and selection coincidence, with and without the use of covariables. Intergenotypic competition is an important factor of environmental variation. The use of competition covariables generally reduces the estimates of variance components and influences genetic gains in the studied... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eucalyptus spp.; Covariable analysis; Selection gains. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600011 |
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