M.R. UMESH, M.A. BASAVANNEPPA, SHIVAKUMAR, MALLESH, B.M. CHITTAPUR, M.Y. AJAYAKUMAR, B.K. DESAI, & N. ANANDA. (2001). Optimization of nitrogenous fertilizers using leaf-colour chart for irrigated hybrid maize (Zea mays) grown in Vertisol of sub-tropical India. Indian Journal of Agronomy, 65(1), 77-82. https://doi.org/10.59797/ija.v65i1.2952