Seleção precoce para características de crescimento em testes clonais de Eucalyptus urophylla (original) (raw)

The efficiency of early selection was assessed in a test of 94 Eucalyptus urophylla clones using the variables diameter at breast height and tree height, evaluated in the municipality of Guanhães – Minas Gerais. The procedure Residual Maximum Likelihood (REML) Best Linear Unbiased Prediction (BLUP) was used to estimate genetic parameters. The direct and indirect gains by early selection were also estimated at age three years for a response at age six; when the 5 best clones were selected when compared to the experimental controls,. The individual coefficients of broad-sense heritability were 53% and 58%, in the two years of evaluation. The predicted gains by early selection at age three years were in agreement of 97.9% for DBH and 95.7% for tree height in relation with the results after six years growth. When selecting at a rate of 5%; 80% of the selected plants were the same in the selection for DAP and 60% for plant height, in the selection at both ages. This finding shows that th...