P. K. GHOSH and N. P. SINGH, “Soil-nitrogen status under summer legumes - maize (Zea mays) sequence”, Indian J Agri Sci, vol. 64, no. 12, May 2013, Accessed: Oct. 29, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/29681