RESPONSE IN BEAN CROPS TO THE APPLICATION OF TRICHODERMA ASPERELLUM VIA SPRAY BAR

Abstract

The study investigated the application of Trichoderma asperellum (strain kd) via spray bar on residual straw in the black bean crop (cultivar BRS Estilo), with the aim of evaluating the different doses (150, 200 and 300 g ha⁻¹) compared to the standard treatment, and was conducted at the Castro EPA PR. The experimental design was in randomized blocks with four treatments, eight plots, and four repetitions. Each plot consisted of 8 lines of 5 meters in length, totaling 20 m² per plot, application at stage V1 of the bean plant with a volume of syrup of 150 L ha-¹, stable climate monitoring and evaluation of stand (30 DAP), biometry of fresh root and dry mass of aerial part (50 DAP), grain yield (80 DAP), and incidence of initial diseases. The results showed that all doses of T. asperellum improved stand and biometry compared to the control, with the 150 g ha⁻¹ dose (T-2) resulting in a good stand (12.1 plants m⁻¹ ) and higher yield (~3. 929.5 kg ha⁻¹, around 28% higher than the control), as well as greater aerial dry mass, although it had lower root weight compared to the higher doses (200 and 300 g ha⁻¹ ), which, in turn, stimulated the root system more but resulted in intermediate productivity. The absence of initial disease symptoms in all treatments reinforces the preventive potential of Trichoderma.