Avaliação da sobrevivência de Bradyrhizobium japonicum em sementes de soja com aditivos celulares e método de aplicação de fungicida

Abstract

Brazil is the world leader in the production and export of soybean. For that, technologies are needed to allow greater grain yield per area and, in addition, are sustainable. In this role, we can mention inoculants which are products based on bacteria responsible for promoting beneficial actions to plants, such as Biological Nitrogen Fixation. The main bacteria sold today is Bradyrhizobium japonicum, which has a symbiotic action with soybeans and which, through nodules formed in this process, makes nitrogen available to the plant. The timing of application of the inoculant is essential, since in this process, viable cells can be lost, which will hinder the action of the inoculant. The pre-inoculation technique is much sought after, as it optimizes the time spent during sowing, facilitating the planting of large areas, but which can end up having a deleterious action on the cells, especially with the use of fungicide. The objective of this work was to analyze different types of cell additives to prolong the survival time of Bradyrhizobium japonicum in soybean seeds, as well as to evaluate the influence of the fungicide treatment method. The best additive for the recovery of bacteria after 2 hours of inoculation was the trehalose syrup and the sucrose syrup obtained better results in the recovery after 24 hours. The application at separate times of the fungicide and inoculant corroborated the literature, obtaining the best results.