Associação da bactéria azospirillum brasilense com a pastagem áries (panicum maximum cv. Áries)

Abstract

The use of pastures for the production of ruminants is one of the economically viable ways, because of the reduction of costs. However, the incorrect way of managing the designated areas for livestock activity is one of the major reasons for the loss of soil fertility, leading to degradation of pastures. With nitrogen fertilization, it is possible to improve these pastures. Thus, studies have been developed to better use of nitrogen. One of them the biological fixation, made by diazotrophic bacteria. The objective of this work was to evaluate the effect of Azospirillum brasilense diazotrophic bacteria inoculated via seeds and foliar inoculated in association with nitrogen rates in Panicum maximum cv. Aries. The design was a 2x5 factorial with four replicates plus one absolute control. Factor 1, two levels: application of the solution of the bacterium Azospirillum brasilense in the seeds, and in the leaves; And factor 2, five total doses of nitrogen: 0, 100, 200, 300, 500 mg / dm³. The application of Azospirillum brasilense diazotrophic bacteria via solution in the seeds, interferes with the development of the Aries pasture, and when accompanied with nitrogen, only in the lower doses interfered in the development. Foliar inoculation when combined with fertilization, the influence was linear with the increase of the nitrogen doses, but the yield is not higher than the seed inoculation. In this way the use of seed inoculation can be used to reduce the nitrogen doses.