Effect of Urea and Humic acid fertilization on some chemical/physical Properties and yield of cow pea Vigna unguiculata (L.) walp. UTJsci [Internet]. 2012 Feb. 25 [cited 2024 Dec. 26];3(2):82-8. Available from: http://mail.jsci.utq.edu.iq/index.php/main/article/view/503