Souza, Euclides Caxambu A. de, Edson Luiz Mendes Coutinho, William Natale, and José Carlos Barbosa. 1998. “Response of Corn to Phosphorus and Zinc Fertilization”. Pesquisa Agropecuaria Brasileira 33 (7):1031-36. https://doi.org/10.1590/S1678-3921.pab1998.v33.4931.