Effect of Urea and Humic acid fertilization on some chemical/physical Properties and yield of cow pea Vigna unguiculata (L.) walp. University of Thi-Qar Journal of Science, [S. l.], v. 3, n. 2, p. 82–88, 2012. Disponível em: https://jsci.utq.edu.iq/index.php/main/article/view/503.. Acesso em: 4 may. 2024.