S. K. Dubey and S. D. Billore, “Effect of level and source of sulphur on symbiotic and biometrical parameters of soybean (Glycine max)”, Indian J Agri Sci, vol. 65, no. 2, May 2012, Accessed: Oct. 21, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/18195