Kumar, Dileep, A. P. Singh, and V. S. Meena. “Improvement of Soil Fertility and Rice Productivity With Use of Coal Derived Humic Acid and Mineral Fertilization under Inceptisol of Varanasi, India”. International Journal of Bio-resource and Stress Management 8, no. Oct, 5 (October 7, 2017): 692–697. Accessed July 27, 2024. https://ojs.pphouse.org/index.php/IJBSM/article/view/1176.