Produtividade e propriedades físico-energéticas de clones e híbridos de Eucalyptus grandis X E. urophylla na região de Botucatu/SP.

Abstract

The forest sector search the wooden production of fast growth and high quality. The genetic improvement, the clone and the hybrid of forest species of the kind Eucalyptus are one of the viable alternatives for the increase of the productivity of reforestations. Considering the scene of the Brazilian forest sector, the objective of this work is to evaluate the productivity of the wood of reforestation with six different treatments, being they: one seminal and two clones of Eucalyptus grandis and three clones of hybrids of E. grandis x E. urophylla, from the physical-energy characteristics, searching quantitative answers for the genetic improvement, the carried through clone and the hybrid in reforestations of 6 years of age cultivated in the region of Botucatu/SP. The basic density was determined by the method of immersion in water and the productivity determined in terms of annual average increments of volume, mass and energy. It was concluded that the productivity of clones of hybrids of E. grandis x E. urophylla got approximately, in basic average, densities 23 % greater, 3 % to less of rind, 11 m3/ha.ano more, 10 ton./ha.ano more and almost the 47 Gcal/ha.ano more of the one than seminal and clones of E. grandis, when cultivated in same edáfo-climatic conditions in the center of the State of São Paulo of Brazil.