B. S. NARAYANA and A. S. RAJU, “Effect of source and level of sulphur on yield and sulphur content of plant parts of sunflower (Helianthus annuus)”, Indian J Agri Sci, vol. 64, no. 3, Apr. 2013, Accessed: Oct. 29, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/29068