Abstract
This experiment aimed to study the interference of Urochloa decumbens, Brachiaria plantaginea, Brachiaria ruziziensis and Panicum maximum (100 plants m-2 density), on the initial growth of clones of eucalyptus (Eucalyptus urograndis) clones 1, 2, 3, 4 and 5. Each pot had one plant of eucalyptus and five weed plants. The experimental design was completely randomized with four replications, constituting a 5x5 factorial design. The height and the diameter of eucalyptus plants were evaluated at 0, 15, 28, 41 and 50 days after weeds transplanting (DAT). At 50 DAT was measured the foliar area of eucalyptus plants, as well as the dry mass of eucalyptus plants (leaves and stem) and the dry mass of weeds. The five clones suffered negative interference during the coexistence with weeds. The clones showed different behaviors through the interaction with weeds. For the more susceptible characteristics to interference – leaves and stem dry mass – eucalyptus clones 3, 4 and 5 were more sensitive to the presence of weeds.
Highlights
In Brazil, the forestry sector is represented by more than six and a half million hectares
This experiment aimed to study the interference of Urochloa decumbens, Brachiaria plantaginea, Brachiaria ruziziensis and Panicum maximum (100 plants m-2 density), on the initial growth of clones of eucalyptus (Eucalyptus urograndis) clones 1, 2, 3, 4 and 5
The eucalyptus initial growth variance analysis indicated that the presence of weeds influenced significantly their height, diameter, foliar area and dry masses
Summary
In Brazil, the forestry sector is represented by more than six and a half million hectares. The coexistence of eucalyptus plants and Urochloa decumbens in densities exceeding 4 plants m-2 led to average reductions of 55, 55 and 63 per cent for leaves dry mass, stem dry mass and foliar area, respectively, at 90 days after eucalyptus seedlings planting (Toledo et al, 2001). The presence of Panicum maximum at the densities from 4 plants m-2 reduced leaves dry mass, stem dry mass and foliar area at approximately 20, 44 and 33 per cent, respectively, at 110 days after eucalyptus seedlings planting (Dinardo et al, 2003). The hypothesis of this study is that the presence of weeds can interfere negatively on the eucalyptus clones growth, restricting characteristics such height, diameter, foliar area, dry masses and, the yield. Germ. & Evrard e Panicum maximum Jacq. on growth characteristics of Eucalyptus urograndis clones
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