FEIJOEIRO INOCULADO COM Rhizobium tropici, ASSOCIADO À APLICAÇÃO DE NITROGÊNIO EM COBERTURA

Abstract

Bean represents an important protein source in the human diet in developing countries of tropical and subtropical regions. It is one of the major components of the Brazilian diet and an important protein source. Regarding the nitrogen supply for the bean, we can mention the use of mineral fertilizers and biological fixation of N2. The fixation efficiency is variable, ranging from 2 to 100 kg N ha-1. Thus it is justified the researches that involve the use of mineral nitrogen fixation with N. The objective of this study was to evaluate doses of nitrogen in the bean cultivation in field conditions, associated with seed inoculation. The study was conducted under field conditions in two traditional bean cultivation area in Paraná northern. The experiment was consisted by plots with or without inoculation of Rhizobium tropici in the seeds and use five N rates (0, 20, 40, 60 and 80 kg ha-1) in cover. The experimental design employed was randomized blocks, being the factorially treatments disposed in five levels of nitrogen with and without inoculation. Evaluations were made about the nodulation, N content in leaves, shoot dry matter, N uptake, number of pods per plant and grain yield. The results showed that application of nitrogen coverage or use of the inoculant did not provide income gains in the bean. Nodulation was affected by the application of mineral nitrogen coverage. The performance of bean differed in the two cultivated areas, which may have been influenced by climatic conditions and management at the sites studied.