P. Aggarwal and B. U. Choudhury, “Physical rating of soils of Delhi region for assessing their production potential*”, Indian J Agri Sci, vol. 75, no. 8, Aug. 2005, Accessed: Oct. 27, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/9139