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| Author(s): |
Maria de Fátima Christe Adorno
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 2002-04-02 |
| Advisor: | José Nivaldo Garcia |
| Abstract | |
The several commercial segments dealing on wood as raw material rely on fast-growing forests. Eucalyptus is one of the most promising genera for replacing native wood for different purposes. The objective of this work was to evaluate technological characteristics aiming at genetic improvement. Eighteen clones of Eucalyptus grandis and 15 clones of E. urophylla from three clonal banks located in Bom Despacho-MG were used. The sawed wood defects related to growth stress were studied. The evaluated characteristics were taper, sawed timber yield, log-end splitting, diametrical board-end splitting, deflection of the first and second slabs, deflection of the beams obtained from these slabs, radial and tangential shear strength, basic density, compression strength parallel to grain, bending strength, elasticity modulus in the bending test and tensile strength parallel to fibers. The variance estimates were obtained by the Moments Method of the Variance Analysis. Ali the studied variables allow good genetic gains through selection, except for taper and sawed timber yield. Heritabilities presented high-magnitude figures, evidencing that choosing such variables favored improvement gains. The species showed distinct results, proving that technological data as well as genetic parameters cannot be extrapolated. (AU) | |