Rushel, A.P. and Ruschel, R. 2014. Synergism of nitrogen uptake from soil and symbiotic nitrogen fixation increasing nitrogen in soybean plant (<i> Glycine max</i>). Pesquisa Agropecuaria Brasileira. 10, 11 (Apr. 2014), 37–40. DOI:https://doi.org/10.1590/S1678-3921.pab1975.v10.17107.