Biomass efficiency and productivity of soybean inoculated with Trichoderma / Eficiência de biomassa e produtividade de soja inoculada com Trichoderma

This work aimed to evaluate the efficiency of the product TrichoPlus (Trichoderma asperellum) as a plant growth promoter in soybean and the productive performance at the field in a floodplain in the municipality of Formoso do Araguaia, Tocantins, Brazil. Four treatments with different doses of the TrichoPlus product (2, 4, 6 and 8 g per kg of seeds) were used in the experiment, plus two treatments being a positive control with a commercial product based on Trichoderma asperellum and an absolute control (without inoculation). Biomass, stand and productivity data were evaluated. For the treatment with the TrichoPlus product, a powder formulation was used, with active ingredient based on Trichoderma asperellum 201, formulated with a minimum concentration of 2 x108 UFC g-1, having graphite in the composition as inert, being applied directly to the seeds before planting, aiming better adherence and protection of the Trichoderma in direct contact with the seed and protection right after planting. Significant results were observed for the treatments with different doses of TrichoPlus in the characteristics of biomass, stand maintenance and productivity. The best dose for productivity was achieved in 5.1 g kg-1 of seed, with gains 12.6 and 6.0% higher compared with the absolute control and positive control treatments, proving its effectiveness in promoting plant growth and, consequently, in the productivity, in the cultivation in floodplain soil.