Associação de Micorrizas Arbusculares e Rizobactérias na produção de mudas clonais de Eucalipto e Teca

Abstract

The aim of this work was to evaluation of the effect of microorganisms application on the growth of Tectona grandis L. f (clones A1 and A3) and Eucalyptus urophylla S. T. Blake (clone I-144), and to do an evaluation of the effect of Fipronil on the viability of mycorrhizal fungi. For this, six treatments were established as mentioned: control - without microorganisms (T1), with Rizolyptus® - Bacillus subtilis (T2), with Acaulospora sp. (T3), with Rhizophagus clarus (T4), with B. subtilis + Acaulospora sp. (T5) and B. subtilis + R. clarus (T6). In the nursery the quality of cuttings were evaluated using the following parameters; survival, root architecture, substrate aggregation, height, stem base diameter, dry mass and mycorrhizal colonization. The teak cuttings were planted on the field and were evaluated the survival, plant height and stem base diameter two times, at 60 and 270 days after the planting. Ten eucalyptus cuttings of the clone I-144 from each of the six treatments were planted in a pot of 3,5 L, where five of them were immersed in Fipronil and the other five were not. The parameters survival, plant height, stem base diameter, dry mass and mycorrhizal colonization were evaluated. In all clones was observed an association with mycorrhizal fungi. In eucalyptus, the T3 showed a high performance in nursery stage. In teak, the clones did not present great differences in the nursery stage. In the field, the treatments with mycorrhizal fungi associated with the rhizobacteria in clone A3 presented a significant increase in plant height and stem base diameter. The Fipronil application did not affect mycorrhizal colonization. So was concluded that the combined application of mycorrhizal fungi and rhizobacteria can be used in the teak plantation to increase the growth rates.