Nitrogen application and inoculation with Rhizobium tropici on common bean in the fall/winter

The objective of this study was to evaluate doses of nitrogen in the cultivation of bean under field conditions, associated with seed inoculation. The study was conducted under field conditions in two traditional bean cultivation in Parana northern (Cafeara and Florestopolis).The experiment consisted of plots with or without seed inoculation with Rhizobium tropici and use of five doses of nitrogen coverage(0, 20, 40, 60 and 80 kg ha-1). Evaluations were made about the nodulation, N content in leaves, shoot dry matter, N uptake, number of pods per plant and grain yield. The experimental design was randomized blocks with ten treatments and four replicates. It was factorially arranged in five levels of nitrogen with and without inoculation. In this study there was no response to inoculation in the evaluation of the yield of bean in Cafeara and Florestopolis with different soil management. The nodulation of bean with Rhizobium is reduced by fertilization with mineral nitrogen. The system with tillage cultivation favored the development of bean during autumn-winter.   Key words: N2 fixation, Rhizobium spp., Phaseolus vulgaris.