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.Objetivou-se analisar parametros de fixacao biologica do nitrogenio em cultivares de soja
em resposta a inoculacao e aplicacao de cobalto e molibdenio via pulverizacao foliar. O delineamento foi
em blocos ao acaso, com testemunhas adicionais com tres repeticoes, consistindo de 18 tratamentos: 15
cultivares tratadas e mais tres cultivares eleitas entre as 15 e utilizadas como testemunhas (nao tratadas).
No estadio V6 avaliaram-se em 5 plantas ao acaso por parcela util os parametros: numero de nodulos
(NNOD), massa seca de nodulos (MNOD), da raiz (MRAIZ) e parte aerea (MFOL). Os dados obtidos
foram submetidos a analise de variancia pelo teste F e as medias comparadas pelo teste de Scott Knott
(p.0,05). Pelos resultados obtidos foram verificadas que as cultivares diferiram entre si quanto aos
parametros de fixacao biologica do nitrogenio. Os maiores valores de NNOD e MNOD foram obtidos nas
cultivares IAC 23 e M-SOY 5942. Para a MRAIZ destacaram-se as cultivares BRS 133 e BRS 184, e para
MFOL a BRS 184. Em relacao as estimativas de correlacoes os melhores resultados foram obtidos para
NNOD x MNOD e MRAIZ x MFOL