VEER SINGH; AMIT BHATNAGAR; AJEET PRATAP SINGH. Evaluation of leaf-colour chart for need-based nitrogen management in maize (Zea mays) grown under irrigated condition of Mollisols. Indian Journal of Agronomy, [S. l.], v. 61, n. 1, p. 64–69, 2001. DOI: 10.59797/ija.v61i1.4324. Disponível em: https://pub.isa-india.in/index.php/ija/article/view/4324. Acesso em: 26 jun. 2026.