G. MAHAJAN and N. K. SEKHON, “Yield and nitrogen-use efficiency of indica rice varieties as influenced by timing of nitrogen fertilization*”, Indian J Agri Sci, vol. 80, no. 4, Jul. 2010, Accessed: Oct. 27, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/230