e Silva, P. S. L., do Rego, M. C., Bezerra, N. F., & de Freitas, C. J. (1993). Effects of weed control and nitrogen levels on protein content of corn grains. Pesquisa Agropecuaria Brasileira, 28(5), 609–612. https://doi.org/10.1590/S1678-3921.pab1993.v28.3916