M.R. UMESH, M.A. BASAVANNEPPA, SHIVAKUMAR, MALLESH, B.M. CHITTAPUR, M.Y. AJAYAKUMAR, et al. Optimization of nitrogenous fertilizers using leaf-colour chart for irrigated hybrid maize (Zea mays) grown in Vertisol of sub-tropical India. IJA [Internet]. 2001 Oct. 10 [cited 2026 Jun. 26];65(1):77-82. Available from: https://pub.isa-india.in/index.php/ija/article/view/2952