Carvalho, A.V. de et al. 2006. Response of African oil palm to nitrogen addition and its influence on the diazotrophic bacteria population. Pesquisa Agropecuaria Brasileira. 41, 2 (Feb. 2006), 293–300. DOI:https://doi.org/10.1590/S1678-3921.pab2006.v41.7136.