Nodulação e produtividade da soja em resposta ao uso de Bradyrhizobium japonicum e Azospirillum brasilense

Abstract

The great importance of the soybean crop is due to its diverse uses, both as food and feed. In Brazil, soybean is already widespread and adapted, being cultivated throughout the country. With the growing demand for this commodity and marketing, it is necessary to produce more efficiently, seeking high yields, making it more competitive in the market. This study aimed to evaluate the association between bacteria called Bradyrhizobium japonicum and Azospirillum brasilense and the use of Nitrogen (N) leaf development and soybean yield under crop-livestock integration system, given the fact that, with the use efficient N, can achieve high yields at lower costs. The experiment was conducted at UTFPR campus Two Neighbors, located at 25 ° 42 'S and 53 ° 06' W, with an average altitude of 520 m; implemented in December 2014, with treatments in a factorial 2x3x2 designed as a randomized block design with three replications, in the case of an experiment with split plots, where the factor A, was the use or not of vetch intercropped with oats and ryegrass preceding soybean, B refers to the use of B. japonicum inoculation; coinoculado (B. japonicum + A. brasilense) and control, without inoculation, the C factor was whether or not in leaf N concentration of 33% in full bloom stage (R2). Evaluating the plant phenology and soybean productivity components. The coinoculação well as the application of foliar N showed no difference in the development of plants and grain productivity, while the subsequent soybeans to consortium with vetch was reduced to grain productivity.