Bansal, R L, and V K Nayyar. “Critical Limit of Manganese for Sunflower (Helianthus Annuus) in Ustochrepts”. The Indian Journal of Agricultural Sciences 65, no. 3 (June 4, 2012). Accessed October 29, 2025. https://epubs.icar.org.in/index.php/IJAgS/article/view/18667.