Efficiency of Trichoderma and Bacillus subtilis as growth promoters in eucalyptus Corymbia citriodora

Abstract

The Eucalyptus is of great relevance for Brazil, inserted in the paper and cellulose segment, with significant impact for the country's economy. The microorganisms have a fundamental role for a fertile life in the soil and are essential for plant growth. In this study, the efficiency of Trichoderma and Bacillus subtilis as growth promoters of Eucalyptus Corymbia citriodora was evaluated. The experiment was composed of eight treatments, five treatments being inoculated with Trichoderma, two inoculated with bacteria and one treatment control without inoculation with sixteen repetitions. Three evaluations were made at 45, 70 and 90 days after germination. For biomass characteristics, most isolates were superior to the control. In relation to relative efficiency, Trichoderma isolates UFT-25, UFT-57, UFT-204 and B. subtilis isolate Bs-08 were superior. For the Dickson Quality throughout the period analyzed, several isolates presented superior results to the test sample. It is concluded that the use of Trichoderma and B. subtilis showed positive results in relation to the control in the initial growth of eucalyptus seedlings Corymbia citriodora, indicating a potential for the use of these microorganisms in the production of seedlings of this particular species, with a better result for the Trichoderma UFT-204 isolate.