AWN, Saif. Production response of four varieties of barley to different levels of nitrogen. المـجلة اليمنية للعلوم الزراعية والبيطرية, [S. l.], v. 1, n. 1, 2021. Disponível em: http://journal.tu.edu.ye/index.php/yjavs/article/view/29. Acesso em: 20 2024.