Neptune, André Martin Louis. 1977. “ Effect of Different Times and Methods of Nitrogen Appllication On, Maize Yieid, Quantity of Protein, Efficienc of the Fertilizer and Its Conversion in Protein, Utilizing Ammonium Sulphate-15N ”. Anais Da Escola Superior De Agricultura Luiz De Queiroz 34 (January): 515-39. https://doi.org/10.1590/S0071-12761977000100041.