Inoculação e co-inoculação de Bradyrhizobium Japonicum e Trichoderma Asperelloides em Crotalaria Juncea

Abstract

Another practice used that brings benefits to subsequent crops is cover crops, which are employed during the off-season to improve soil quality and maintain crop rotation. In this context, one of the most studied crops, which shows significant positive results, is Crotalaria juncea. To encourage the use of this crop, this study aimed to evaluate the performance of Crotalaria juncea in response to co-inoculation with Bradyrhizobium japonicum and Trichoderma asperelloides. The experiment was conducted at the experimental area of the Federal University of Southern Border, Cerro Largo campus, RS. The treatments used were two types of inoculants arranged as follows: T1 = Trichoderma, T2 = Bradyrhizobium, T3 = Trichoderma + Bradyrhizobium, and T4 = no inoculation. Due to the heterogeneity of the area, a randomized block design with 4 repetitions was used, totaling 16 experimental units. In this study, the root system (RS), aerial part height (AP), and number of leaves (NL) were evaluated, with assessments divided into two periods during the crop development: the first was performed at 19 days after sowing (DAS), and the second at 30 DAS. Inoculation with Trichoderma asperelloides resulted in a significant increase in root length at 19 days after sowing (DAS) and favored the overall plant development at 30 DAS. The coinoculation with Trichoderma asperelloides and Bradyrhizobium japonicum showed results similar to the inoculation with Trichoderma asperelloides. Inoculation with Bradyrhizobium japonicum, on the other hand, did not show significant effects compared to the control treatment, indicating that the benefits observed in the coinoculation were likely attributed to the presence of Trichoderma asperelloides.