Lopes, L.O., Moura, M.C.S. de, Matias, S.S.R., Lopes, R. dos S. and Teixeira, M.P.R. 2017. Effect of sources and doses of sulfate on soybean crop. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics]. 47, 3 (Sep. 2017), 296–302.