Rushel, A. P., & 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), 37–40. https://doi.org/10.1590/S1678-3921.pab1975.v10.17107