TY - SER AU - Guimarães,A.P. AU - Morais,R.F.de AU - Urquiaga,S. AU - Boddey,R.M. AU - Alves,B.J.R. TI - Bradyrhizobium strain and the 15N natural abundance quantification of biological N2 fixation in soybean KW - SOJA KW - GLYCINE MAX KW - NITROGÊNIO KW - BRADYRHIZOBIUM JAPONICUM ER -