Cordeiro, D. S., Silveira, E. P., & Kichel, A. N. (1993). Response of Brassica napus to rates and time of nitrogen application. Pesquisa Agropecuaria Brasileira, 28(10), 1137-1142. https://doi.org/10.1590/S1678-3921.pab1993.v28.3979