Soybean productivity with Trichoderma asperellum seed treatment in different regions of the Brazilian Cerrado

Abstract

The purpose of this study was to evaluate the efficiency of the product containing Trichoderma asperellum 201 in soybean field productivity in different regions of the Brazilian Cerrado. Thirty-five experiments were conducted in the states of Bahia and Tocantins, in different municipalities, in the 2017/2018, 2018/2019 and 2019/2020 seasons. The treatments used were the seed treatment with T. asperellum and a control (without inoculation of Trichoderma). The seeds were inoculated (TS) with product containing T. asperellum, at a dose of 5 g per kg of seeds, formulated with a minimum concentration of 2 x 10⁸ CFU g^-1, with graphite as an inert material in the formulation. In all fields in the states of Bahia and Tocantins, positive effects (p < 0.05) of inoculation of the T. asperellum were observed in the productivity of different soybean cultivars. In the Bahia state fields, productivity gains varied between seasons, with an average productivity gain of 8.01% seen for the 2017/2018 crop, 3.97% for the 2018/2019 crop, and 9.23% for the 2019/2020 crop. In Tocantins, the average productivity, considering all experiments, was 13.02%.