Desenvolvimento agronômico do milho solteiro e consorciado com Brachiaria Ruziziensis inoculado com Azospirillum e adubação nitrogenada

Abstract

The nitrogen fertilization is used as the main source of nitrogen (N) for corn plants, although it is not the only way to get that nutrient. A very interesting resource and barely studied for this crop is the nitrogen getting through microorganisms like bacteria. Thus, the objective of this article is to evaluate the agronomic development of corn plants under two systems: only-corn planting, and corn with covergrass Brachiaria ruziziensis, using equal doses of urea and inoculant, applied together and separately. The experiment was developed at Don Fiorindo farm, in Dourados-MS, in plots subdivided with three repetitions. The plots were constituted by the cultivation systems (maize intercropped only-corn system, and corn-and- grass with Brachiaria ruziziensis system), and the subplots by the inoculant and/or nitrogen fertilization. It was evaluated the stalk diameter, plant height, corn cob height insertion, corn cob length, mass of a thousand grains, and productivity. All the results were significant when comparted to testimony. Only the stalk diameter had significant difference among the cultivation systems, which can be explained by the overpopulated grass. Thus, it can be understood that the corn-and-grass system is a good option, if managed the grass population adequately, because it does not affect the majority of attributes evaluated.