S. N. VASUDEVAN, K. VIRUPAKSHAPPA, N. VENUGOPAL, and S. BHASKAR, “Response of sunflower (Helianthus annuus) to phosphorus, sulphur, micronutrients and humic acid under irrigated condition on red sandy-loam soil”, Indian J Agri Sci, vol. 67, no. 3, May 2013, Accessed: Oct. 20, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/29858