VEER SINGH, AMIT BHATNAGAR, and AJEET PRATAP SINGH. 2001. “Evaluation of Leaf-Colour Chart for Need-Based Nitrogen Management in Maize (Zea Mays) Grown under Irrigated Condition of Mollisols”. Indian Journal of Agronomy 61 (1): 64-69. https://doi.org/10.59797/ija.v61i1.4324.