Trichoderma as a growth promoter in Astronium urundeuva (M. Allemão) Engl.

Abstract

The low growth is one of the biggest problems encountered in the production of native forest seedlings. Fungi of the genus Trichoderma are microorganisms capable of potentialize the plant growth. Thereby, this article aims to evaluate the efficiency of Trichoderma inoculation, as a plant growth promoter of Aroeira seedlings (Astronium urundeuva (M. Allemão) Engl.), in the greenhouse. The isolated ones, at the approximate concentration of conidia at 1 x 10⁹ per colonized gram of rice, were individually mixed with the soil in a homogeneous form in the experiments with and without phosphate fertilization. For the control treatment, sterilized rice without Trichoderma was used. Two experiments were carried out, at 50 and 100 days after the sowing (DAS). Were evaluated the biomass characteristics of the selected crop through the dry mass of aerial part, the root dry mass and the total dry mass, as well as the relative efficiency and quality index of Dickson. The experiment whose received the natural fertilizer phosphate, occurred a variation of 25.4 to 925% in growth promotion, compared to the control treatment. The experiment without fertilizer showed a variation of 26.5 to 425.4% in growth, compared to the control treatment. The results demonstrate the capacity of isolated Trichoderma to promote an initial growth with or without natural fertilize phosphate to Aroeira.