VASUDEVAN SN, VIRUPAKSHAPPA K, VENUGOPAL N, BHASKAR S. Response of sunflower (Helianthus annuus) to phosphorus, sulphur, micronutrients and humic acid under irrigated condition on red sandy-loam soil. Indian J Agri Sci. 2013;67(3). Accessed October 20, 2025. https://epubs.icar.org.in/index.php/IJAgS/article/view/29858