Aquino, B.F. de and Mello, F. de A.F. de 1983. Effects of the addition of ammonium sulfate and corn plants residues (Zea mays L: ) on the contents of carbon, nitrogen and c/n relation of three clayish soils . Anais da Escola Superior de Agricultura Luiz de Queiroz. 40, 1 (Jan. 1983), 395–422. DOI:https://doi.org/10.1590/S0071-12761983000100021.