Desenvolvimento inicial de cana-de-açúcar inoculadas com diferentes estirpes de bactérias diazotróficas

Abstract

Brazil is the largest producer of sugarcane (Saccharum sp.) in the world. The cultivation is today one of the most important for national agribusiness, being the raw material of greater viability for the production of biofuels. Despite this, there is still much to be improved in the cultivation of sugarcane in the country, including with regard to plant nutrition. Nitrogen fertilization is one of the most limiting factors for the development and expression of the productive potential of the crop, however, this practice can become very costly for the producer, making it necessary to search for alternatives that combine lower cost with the constant search for increases in productivity. Thus, is created the inoculation of diazotrophic rhizobacteria. The ability to fix atmospheric nitrogen that these microorganisms demonstrate, in the right conditions, can partially or completely replace the application of nitrogenous fertilizers. In this way, the main objective of this work was to evaluate the development of sugarcane cultivars RB867515 and RB92579 under individual inoculation of five different strains of diazotrophic bacteria, as well as inoculated with a mixture of these strains, being: Herbaspirillum rubrisubalbicans (BR 11504), Herbaspirillum seropedicae (BR 11335), Gluconacetobacter diazotrophicus (BR 11115), Azospirillum amazonense (BR 11281) and Burkholderia tropica (BR 11366). The design of the project consisted of a 2 x 7 factorial design, delineated in a completely randomized. It was collected in the experimental area of UFFS - Campus Chapecó, sugarcane setts that were inoculated and conducted in a germination chamber. Data were submitted to analysis of variance by the F test (5% of significance) and, in the case of significance, the regression analysis was performed using the WinStat® program. The results indicated the mixtures of strains as the best treatment for both cultivars, besides that, the individual inoculation of B. tropica was highlighted for cultivar RB867515.