V. KATYAL and B. GANGWAR, “Long-term effect of integrated nutrient management on crop productivity of rice (Oryza sativa) -rice system*”, Indian J Agri Sci, vol. 70, no. 2, Mar. 2013, Accessed: Oct. 28, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/28049