Production response of four varieties of barley to different levels of nitrogen. Yemeni Journal of Agriculture & Veterinary Sciences, [S. l.], v. 1, n. 1, 2021. DOI: 10.70022/yjavs.v1i1.29. Disponível em: https://journal.tu.edu.ye/index.php/yjavs/article/view/29. Acesso em: 18 apr. 2026.