ANALYSIS OF PARAMETERS OF BIOLOGICAL NITROGEN FIXATION IN SOYBEAN COMMERCIAL CULTIVARS

Abstract

It was objectified to analyze parameters of biological nitrogen fixation in soybean cultivars in response to the inoculation and foliar application of cobalt and molybdenum. The experimental design was the complete randomized block with additional checks, with three replications, consisting of 18 treatments: 15 soybean cultivars treated and more three cultivars chosen among the 15 cultivars and used as checks (not treated). In the stadium V6 were evaluated in 5 plants to the for useful portion the parameters: number of nodules (NNOD), the nodules dry weight (WNOD), the root (WROOT) and the shoots (WSHO). The obtained data were submitted the variance analysis by the test F and the averages compared by Scott Knott's test (p?0,05). For the obtained results were verified that the soybean cultivars differed to each other with relationship to the parameters of biological nitrogen fixation. The largest values of NNOD and WNOD were obtained in cultivars IAC 23 and M-SOY 5942. For WROOT they stood out you cultivars them BRS 133 and BRS 184 and for WSHO BRS 184. In relationship the estimates of correlations the best results were obtained for NNOD x WNOD and WROOT x WSHO.