K. Laxminarayana, “Predicting nitrogen availability for rice (Oryza sativa) through carbon-nitrogen relationship under Himalayan acidic soils of north-eastern India”, Indian J Agri Sci, vol. 78, no. 7, Jul. 2008, Accessed: Oct. 27, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/9826