R. K. SARKAR and R. B. MALLICK, “Effect of nitrogen, sulphur and foliar spray of nitrate salts on performance ofspring sunflower (Helianthus annuus)”, Indian J Agri Sci, vol. 79, no. 12, Jan. 2011, Accessed: Oct. 27, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/2554